Pub Date : 2024-10-29DOI: 10.1103/physrevlett.133.180201
Farhan Hanif, Debarshi Das, Jonathan Halliwell, Dipankar Home, Anupam Mazumdar, Hendrik Ulbricht, Sougato Bose
A defining signature of classical systems is “in principle measurability” without disturbance: a feature manifestly violated by quantum systems. We describe a multi-interferometer experimental setup that can, in principle, reveal the nonclassicality of a spatial superposition-sourced gravitational field if an irreducible disturbance is caused by a measurement of gravity. While one interferometer sources the field, the others are used to measure the gravitational field created by the superposition. This requires neither any specific form of nonclassical gravity, nor the generation of entanglement between any relevant degrees of freedom at any stage, thus distinguishing it from the experiments proposed so far. This test, when added to the recent entanglement-witness based proposals, enlarges the domain of quantum postulates being tested for gravity. Moreover, the proposed test yields a signature of quantum measurement induced disturbance for any finite rate of decoherence, and is device independent.
{"title":"Testing Whether Gravity Acts as a Quantum Entity When Measured","authors":"Farhan Hanif, Debarshi Das, Jonathan Halliwell, Dipankar Home, Anupam Mazumdar, Hendrik Ulbricht, Sougato Bose","doi":"10.1103/physrevlett.133.180201","DOIUrl":"https://doi.org/10.1103/physrevlett.133.180201","url":null,"abstract":"A defining signature of classical systems is “in principle measurability” without disturbance: a feature manifestly violated by quantum systems. We describe a multi-interferometer experimental setup that can, in principle, reveal the nonclassicality of a spatial superposition-sourced gravitational field if an irreducible disturbance is caused by a measurement of gravity. While one interferometer sources the field, the others are used to measure the gravitational field created by the superposition. This requires neither any specific form of nonclassical gravity, nor the generation of entanglement between any relevant degrees of freedom at any stage, thus distinguishing it from the experiments proposed so far. This test, when added to the recent entanglement-witness based proposals, enlarges the domain of quantum postulates being tested for gravity. Moreover, the proposed test yields a signature of quantum measurement induced disturbance for any finite rate of decoherence, and is device independent.","PeriodicalId":20069,"journal":{"name":"Physical review letters","volume":"6 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142556429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-29DOI: 10.1103/physrevlett.133.186903
Vladislav Yu. Shishkov, Evgeny S. Andrianov, Sergei Tretiak, K. Birgitta Whaley, Anton V. Zasedatelev
We demonstrate a macrocoherent regime in exciton-polariton systems, where nonequilibrium polariton Bose-Einstein condensation coexists with macroscopically occupied vibrational states. Strong exciton-vibration coupling induces an effective optomechanical interaction between cavity polaritons and vibrational degrees of freedom of molecules, leading to vibrational amplification in a resonant blue-detuned configuration. This interaction provides a sympathetic mechanism to achieve vibrational condensation with potential applications in cavity-controlled chemistry, nonlinear, and quantum optics.
{"title":"Sympathetic Mechanism for Vibrational Condensation Enabled by Polariton Optomechanical Interaction","authors":"Vladislav Yu. Shishkov, Evgeny S. Andrianov, Sergei Tretiak, K. Birgitta Whaley, Anton V. Zasedatelev","doi":"10.1103/physrevlett.133.186903","DOIUrl":"https://doi.org/10.1103/physrevlett.133.186903","url":null,"abstract":"We demonstrate a macrocoherent regime in exciton-polariton systems, where nonequilibrium polariton Bose-Einstein condensation coexists with macroscopically occupied vibrational states. Strong exciton-vibration coupling induces an effective optomechanical interaction between cavity polaritons and vibrational degrees of freedom of molecules, leading to vibrational amplification in a resonant blue-detuned configuration. This interaction provides a sympathetic mechanism to achieve vibrational condensation with potential applications in cavity-controlled chemistry, nonlinear, and quantum optics.","PeriodicalId":20069,"journal":{"name":"Physical review letters","volume":"126 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142556486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-29DOI: 10.1103/physrevlett.133.183803
X. Lin, M. T. Hartman, B. Pointard, R. Le Targat, P. Goldner, S. Seidelin, B. Fang, Y. Le Coq
We investigate the frequency response of narrow spectral holes in a doped crystal structure as a function of temperature below 1 K. We identify a particular regime in which this response significantly deviates from the expected two-phonon Raman scattering theory. Namely, near 290 mK, we observed a behavior exhibiting a temperature-dependent frequency shift of zero to first order. This is of particular interest for applications that require high frequency stability, such as laser frequency stabilization, as by operating the scheme at this specific point would result in the spectral hole frequency being highly immune to temperature fluctuations, providing the potential for a laser fractional frequency instability as low as <mjx-container ctxtmenu_counter="3" ctxtmenu_oldtabindex="1" jax="CHTML" overflow="linebreak" role="tree" sre-explorer- style="font-size: 100.7%;" tabindex="0"><mjx-math data-semantic-structure="(10 8 0 (9 1 2 (7 3 (6 4 5))))"><mjx-mrow data-semantic-children="8,9" data-semantic-content="0" data-semantic- data-semantic-owns="8 0 9" data-semantic-role="equality" data-semantic-speech="tilde 2 times 10 Superscript negative 22" data-semantic-type="relseq"><mjx-mrow data-semantic-added="true" data-semantic- data-semantic-parent="10" data-semantic-role="unknown" data-semantic-type="empty"></mjx-mrow><mjx-mo data-semantic- data-semantic-operator="relseq,∼" data-semantic-parent="10" data-semantic-role="equality" data-semantic-type="relation"><mjx-c>∼</mjx-c></mjx-mo><mjx-mrow data-semantic-added="true" data-semantic-children="1,7" data-semantic-content="2" data-semantic- data-semantic-owns="1 2 7" data-semantic-parent="10" data-semantic-role="multiplication" data-semantic-type="infixop" space="4"><mjx-mn data-semantic-annotation="clearspeak:simple" data-semantic-font="normal" data-semantic- data-semantic-parent="9" data-semantic-role="integer" data-semantic-type="number"><mjx-c>2</mjx-c></mjx-mn><mjx-mo data-semantic- data-semantic-operator="infixop,×" data-semantic-parent="9" data-semantic-role="multiplication" data-semantic-type="operator" space="3"><mjx-c>×</mjx-c></mjx-mo><mjx-msup data-semantic-children="3,6" data-semantic- data-semantic-owns="3 6" data-semantic-parent="9" data-semantic-role="integer" data-semantic-type="superscript" space="3"><mjx-mrow><mjx-mn data-semantic-annotation="clearspeak:simple" data-semantic-font="normal" data-semantic- data-semantic-parent="7" data-semantic-role="integer" data-semantic-type="number"><mjx-c noic="true" style="padding-top: 0.642em;">1</mjx-c><mjx-c style="padding-top: 0.642em;">0</mjx-c></mjx-mn></mjx-mrow><mjx-script style="vertical-align: 0.369em;"><mjx-mrow data-semantic-annotation="clearspeak:simple" data-semantic-children="5" data-semantic-content="4" data-semantic- data-semantic-owns="4 5" data-semantic-parent="7" data-semantic-role="negative" data-semantic-type="prefixop" size="s"><mjx-mo data-semantic- data-semantic-operator="prefixop,−" data-semantic-parent="6" data-semantic-role=
我们研究了掺杂晶体结构中窄谱孔的频率响应与 1 K 以下温度的函数关系。我们确定了一个特定的机制，在这个机制中，这种响应明显偏离了预期的双声子拉曼散射理论。也就是说，在 290 mK 附近，我们观察到了一种表现为零到一阶的随温度变化的频率偏移的行为。这对于需要高频率稳定性的应用（如激光稳频）特别有意义，因为在这一特定点运行该方案将导致谱孔频率对温度波动高度免疫，从而为 1 秒内低至∼2×10-22 的激光分数频率不稳定性提供了可能性。
{"title":"Anomalous Subkelvin Thermal Frequency Shifts of Ultranarrow Linewidth Solid State Emitters","authors":"X. Lin, M. T. Hartman, B. Pointard, R. Le Targat, P. Goldner, S. Seidelin, B. Fang, Y. Le Coq","doi":"10.1103/physrevlett.133.183803","DOIUrl":"https://doi.org/10.1103/physrevlett.133.183803","url":null,"abstract":"We investigate the frequency response of narrow spectral holes in a doped crystal structure as a function of temperature below 1 K. We identify a particular regime in which this response significantly deviates from the expected two-phonon Raman scattering theory. Namely, near 290 mK, we observed a behavior exhibiting a temperature-dependent frequency shift of zero to first order. This is of particular interest for applications that require high frequency stability, such as laser frequency stabilization, as by operating the scheme at this specific point would result in the spectral hole frequency being highly immune to temperature fluctuations, providing the potential for a laser fractional frequency instability as low as <mjx-container ctxtmenu_counter=\"3\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math data-semantic-structure=\"(10 8 0 (9 1 2 (7 3 (6 4 5))))\"><mjx-mrow data-semantic-children=\"8,9\" data-semantic-content=\"0\" data-semantic- data-semantic-owns=\"8 0 9\" data-semantic-role=\"equality\" data-semantic-speech=\"tilde 2 times 10 Superscript negative 22\" data-semantic-type=\"relseq\"><mjx-mrow data-semantic-added=\"true\" data-semantic- data-semantic-parent=\"10\" data-semantic-role=\"unknown\" data-semantic-type=\"empty\"></mjx-mrow><mjx-mo data-semantic- data-semantic-operator=\"relseq,∼\" data-semantic-parent=\"10\" data-semantic-role=\"equality\" data-semantic-type=\"relation\"><mjx-c>∼</mjx-c></mjx-mo><mjx-mrow data-semantic-added=\"true\" data-semantic-children=\"1,7\" data-semantic-content=\"2\" data-semantic- data-semantic-owns=\"1 2 7\" data-semantic-parent=\"10\" data-semantic-role=\"multiplication\" data-semantic-type=\"infixop\" space=\"4\"><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"9\" data-semantic-role=\"integer\" data-semantic-type=\"number\"><mjx-c>2</mjx-c></mjx-mn><mjx-mo data-semantic- data-semantic-operator=\"infixop,×\" data-semantic-parent=\"9\" data-semantic-role=\"multiplication\" data-semantic-type=\"operator\" space=\"3\"><mjx-c>×</mjx-c></mjx-mo><mjx-msup data-semantic-children=\"3,6\" data-semantic- data-semantic-owns=\"3 6\" data-semantic-parent=\"9\" data-semantic-role=\"integer\" data-semantic-type=\"superscript\" space=\"3\"><mjx-mrow><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"7\" data-semantic-role=\"integer\" data-semantic-type=\"number\"><mjx-c noic=\"true\" style=\"padding-top: 0.642em;\">1</mjx-c><mjx-c style=\"padding-top: 0.642em;\">0</mjx-c></mjx-mn></mjx-mrow><mjx-script style=\"vertical-align: 0.369em;\"><mjx-mrow data-semantic-annotation=\"clearspeak:simple\" data-semantic-children=\"5\" data-semantic-content=\"4\" data-semantic- data-semantic-owns=\"4 5\" data-semantic-parent=\"7\" data-semantic-role=\"negative\" data-semantic-type=\"prefixop\" size=\"s\"><mjx-mo data-semantic- data-semantic-operator=\"prefixop,−\" data-semantic-parent=\"6\" data-semantic-role=","PeriodicalId":20069,"journal":{"name":"Physical review letters","volume":"118 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142556495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-29DOI: 10.1103/physrevlett.133.180601
Yifan Hong, Elijah Durso-Sabina, David Hayes, Andrew Lucas
Quantum error correction protects logical quantum information against environmental decoherence by encoding logical qubits into entangled states of physical qubits. One of the most important near-term challenges in building a scalable quantum computer is to reach the break-even point, where logical quantum circuits on error-corrected qubits achieve higher fidelity than equivalent circuits on uncorrected physical qubits. Using Quantinuum’s H2 trapped-ion quantum processor, we encode the Greenberger–Horne–Zeilinger (GHZ) state in four logical qubits with fidelity <mjx-container ctxtmenu_counter="6" ctxtmenu_oldtabindex="1" jax="CHTML" overflow="linebreak" role="tree" sre-explorer- style="font-size: 100.7%;" tabindex="0"><mjx-math data-semantic-structure="(15 (11 0 1 2) 3 (14 12 4 5 6 (13 7 8 9)) 10)"><mjx-mrow data-semantic-children="11,3,14,10" data-semantic-content="3,10" data-semantic- data-semantic-owns="11 3 14 10" data-semantic-role="sequence" data-semantic-speech="99.5 plus or minus 0.15 percent sign less than or equals upper F less than or equals 99.7 plus or minus 0.1 percent sign" data-semantic-type="punctuated"><mjx-mrow data-semantic-added="true" data-semantic-children="0,2" data-semantic-content="1" data-semantic- data-semantic-owns="0 1 2" data-semantic-parent="15" data-semantic-role="addition" data-semantic-type="infixop"><mjx-mn data-semantic-annotation="clearspeak:simple" data-semantic-font="normal" data-semantic- data-semantic-parent="11" data-semantic-role="float" data-semantic-type="number"><mjx-c noic="true" style="padding-top: 0.646em;">9</mjx-c><mjx-c noic="true" style="padding-top: 0.646em;">9</mjx-c><mjx-c noic="true" style="padding-top: 0.646em;">.</mjx-c><mjx-c style="padding-top: 0.646em;">5</mjx-c></mjx-mn><mjx-mo data-semantic- data-semantic-operator="infixop,±" data-semantic-parent="11" data-semantic-role="addition" data-semantic-type="operator" space="3"><mjx-c>±</mjx-c></mjx-mo><mjx-mn data-semantic-annotation="clearspeak:simple" data-semantic-font="normal" data-semantic- data-semantic-parent="11" data-semantic-role="float" data-semantic-type="number" space="3"><mjx-c noic="true" style="padding-top: 0.642em;">0</mjx-c><mjx-c noic="true" style="padding-top: 0.642em;">.</mjx-c><mjx-c noic="true" style="padding-top: 0.642em;">1</mjx-c><mjx-c style="padding-top: 0.642em;">5</mjx-c></mjx-mn></mjx-mrow><mjx-mo data-semantic- data-semantic-operator="punctuated" data-semantic-parent="15" data-semantic-role="unknown" data-semantic-type="punctuation"><mjx-c>%</mjx-c></mjx-mo><mjx-mrow data-semantic-added="true" data-semantic-children="12,5,13" data-semantic-content="4,6" data-semantic- data-semantic-owns="12 4 5 6 13" data-semantic-parent="15" data-semantic-role="inequality" data-semantic-type="relseq"><mjx-mrow data-semantic-added="true" data-semantic- data-semantic-parent="14" data-semantic-role="unknown" data-semantic-type="empty"></mjx-mrow><mjx-mo data-semantic- data-semantic-operator="relseq,≤" data-semantic-parent="14"
{"title":"Entangling Four Logical Qubits beyond Break-Even in a Nonlocal Code","authors":"Yifan Hong, Elijah Durso-Sabina, David Hayes, Andrew Lucas","doi":"10.1103/physrevlett.133.180601","DOIUrl":"https://doi.org/10.1103/physrevlett.133.180601","url":null,"abstract":"Quantum error correction protects logical quantum information against environmental decoherence by encoding logical qubits into entangled states of physical qubits. One of the most important near-term challenges in building a scalable quantum computer is to reach the break-even point, where logical quantum circuits on error-corrected qubits achieve higher fidelity than equivalent circuits on uncorrected physical qubits. Using Quantinuum’s H2 trapped-ion quantum processor, we encode the Greenberger–Horne–Zeilinger (GHZ) state in four logical qubits with fidelity <mjx-container ctxtmenu_counter=\"6\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math data-semantic-structure=\"(15 (11 0 1 2) 3 (14 12 4 5 6 (13 7 8 9)) 10)\"><mjx-mrow data-semantic-children=\"11,3,14,10\" data-semantic-content=\"3,10\" data-semantic- data-semantic-owns=\"11 3 14 10\" data-semantic-role=\"sequence\" data-semantic-speech=\"99.5 plus or minus 0.15 percent sign less than or equals upper F less than or equals 99.7 plus or minus 0.1 percent sign\" data-semantic-type=\"punctuated\"><mjx-mrow data-semantic-added=\"true\" data-semantic-children=\"0,2\" data-semantic-content=\"1\" data-semantic- data-semantic-owns=\"0 1 2\" data-semantic-parent=\"15\" data-semantic-role=\"addition\" data-semantic-type=\"infixop\"><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"11\" data-semantic-role=\"float\" data-semantic-type=\"number\"><mjx-c noic=\"true\" style=\"padding-top: 0.646em;\">9</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.646em;\">9</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.646em;\">.</mjx-c><mjx-c style=\"padding-top: 0.646em;\">5</mjx-c></mjx-mn><mjx-mo data-semantic- data-semantic-operator=\"infixop,±\" data-semantic-parent=\"11\" data-semantic-role=\"addition\" data-semantic-type=\"operator\" space=\"3\"><mjx-c>±</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"11\" data-semantic-role=\"float\" data-semantic-type=\"number\" space=\"3\"><mjx-c noic=\"true\" style=\"padding-top: 0.642em;\">0</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.642em;\">.</mjx-c><mjx-c noic=\"true\" style=\"padding-top: 0.642em;\">1</mjx-c><mjx-c style=\"padding-top: 0.642em;\">5</mjx-c></mjx-mn></mjx-mrow><mjx-mo data-semantic- data-semantic-operator=\"punctuated\" data-semantic-parent=\"15\" data-semantic-role=\"unknown\" data-semantic-type=\"punctuation\"><mjx-c>%</mjx-c></mjx-mo><mjx-mrow data-semantic-added=\"true\" data-semantic-children=\"12,5,13\" data-semantic-content=\"4,6\" data-semantic- data-semantic-owns=\"12 4 5 6 13\" data-semantic-parent=\"15\" data-semantic-role=\"inequality\" data-semantic-type=\"relseq\"><mjx-mrow data-semantic-added=\"true\" data-semantic- data-semantic-parent=\"14\" data-semantic-role=\"unknown\" data-semantic-type=\"empty\"></mjx-mrow><mjx-mo data-semantic- data-semantic-operator=\"relseq,≤\" data-semantic-parent=\"14\"","PeriodicalId":20069,"journal":{"name":"Physical review letters","volume":"126 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142556465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-29DOI: 10.1103/physrevlett.133.186603
Cheolhee Han, June-Young M. Lee, H.-S. Sim
On the edge of certain fractional quantum Hall states, e.g., at 2/3 and 5/2 filling, a local fractional excitation, occurring by anyon tunneling at a quantum point contact, is further fractionalized into counterpropagating charge and neutral (Abelian or non-Abelian) anyonic excitations. We propose a scheme to detect the braiding statistics of the charge and neutral anyons separately. It is the injection of a dilute beam of a target (charge or neutral) anyon to a Fabry-Perot interferometer. The monodromy of the target anyon is obtained by comparing the amplitude and phase of the interference current with a reference signal of the same setup but without the injection. Our proposal relies on braiding between anyons on the edge, and applies even in the presence of bulk-edge couplings.
{"title":"Anyon Interferometry to Detect Braiding Statistics of Neutral Modes","authors":"Cheolhee Han, June-Young M. Lee, H.-S. Sim","doi":"10.1103/physrevlett.133.186603","DOIUrl":"https://doi.org/10.1103/physrevlett.133.186603","url":null,"abstract":"On the edge of certain fractional quantum Hall states, e.g., at <mjx-container ctxtmenu_counter=\"27\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math data-semantic-structure=\"(3 0 1 2)\"><mjx-mrow data-semantic-children=\"0,2\" data-semantic-content=\"1\" data-semantic- data-semantic-owns=\"0 1 2\" data-semantic-role=\"division\" data-semantic-speech=\"2 divided by 3\" data-semantic-type=\"infixop\"><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"3\" data-semantic-role=\"integer\" data-semantic-type=\"number\"><mjx-c>2</mjx-c></mjx-mn><mjx-mo data-semantic- data-semantic-operator=\"infixop,/\" data-semantic-parent=\"3\" data-semantic-role=\"division\" data-semantic-type=\"operator\"><mjx-c>/</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"3\" data-semantic-role=\"integer\" data-semantic-type=\"number\"><mjx-c>3</mjx-c></mjx-mn></mjx-mrow></mjx-math></mjx-container> and <mjx-container ctxtmenu_counter=\"28\" ctxtmenu_oldtabindex=\"1\" jax=\"CHTML\" overflow=\"linebreak\" role=\"tree\" sre-explorer- style=\"font-size: 100.7%;\" tabindex=\"0\"><mjx-math data-semantic-structure=\"(3 0 1 2)\"><mjx-mrow data-semantic-children=\"0,2\" data-semantic-content=\"1\" data-semantic- data-semantic-owns=\"0 1 2\" data-semantic-role=\"division\" data-semantic-speech=\"5 divided by 2\" data-semantic-type=\"infixop\"><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"3\" data-semantic-role=\"integer\" data-semantic-type=\"number\"><mjx-c>5</mjx-c></mjx-mn><mjx-mo data-semantic- data-semantic-operator=\"infixop,/\" data-semantic-parent=\"3\" data-semantic-role=\"division\" data-semantic-type=\"operator\"><mjx-c>/</mjx-c></mjx-mo><mjx-mn data-semantic-annotation=\"clearspeak:simple\" data-semantic-font=\"normal\" data-semantic- data-semantic-parent=\"3\" data-semantic-role=\"integer\" data-semantic-type=\"number\"><mjx-c>2</mjx-c></mjx-mn></mjx-mrow></mjx-math></mjx-container> filling, a local fractional excitation, occurring by anyon tunneling at a quantum point contact, is further fractionalized into counterpropagating charge and neutral (Abelian or non-Abelian) anyonic excitations. We propose a scheme to detect the braiding statistics of the charge and neutral anyons separately. It is the injection of a dilute beam of a target (charge or neutral) anyon to a Fabry-Perot interferometer. The monodromy of the target anyon is obtained by comparing the amplitude and phase of the interference current with a reference signal of the same setup but without the injection. Our proposal relies on braiding between anyons on the edge, and applies even in the presence of bulk-edge couplings.","PeriodicalId":20069,"journal":{"name":"Physical review letters","volume":"32 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142556487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-28DOI: 10.1103/physrevlett.133.186601
Wojciech J. Jankowski, Robert-Jan Slager
We show that certain three-dimensional multigap topological insulators can host quantized integrated shift photoconductivities due to bulk invariants that are defined under reality conditions imposed by additional symmetries. We recast the quantization in terms of the integrated torsion tensor and the non-Abelian Berry connection constituting Chern-Simons forms. Physically, we recognize that the topological quantization emerges purely from virtual transitions contributing to the optical response. Our findings provide another quantized electromagnetic dc response due to the nontrivial band topology, beyond the quantum anomalous Hall effect of Chern insulators and quantized circular photogalvanic effect found in Weyl semimetals.
{"title":"Quantized Integrated Shift Effect in Multigap Topological Phases","authors":"Wojciech J. Jankowski, Robert-Jan Slager","doi":"10.1103/physrevlett.133.186601","DOIUrl":"https://doi.org/10.1103/physrevlett.133.186601","url":null,"abstract":"We show that certain three-dimensional multigap topological insulators can host quantized integrated shift photoconductivities due to bulk invariants that are defined under reality conditions imposed by additional symmetries. We recast the quantization in terms of the integrated torsion tensor and the non-Abelian Berry connection constituting Chern-Simons forms. Physically, we recognize that the topological quantization emerges purely from virtual transitions contributing to the optical response. Our findings provide another quantized electromagnetic dc response due to the nontrivial band topology, beyond the quantum anomalous Hall effect of Chern insulators and quantized circular photogalvanic effect found in Weyl semimetals.","PeriodicalId":20069,"journal":{"name":"Physical review letters","volume":"67 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142556491","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-28DOI: 10.1103/physrevlett.133.180801
Lei Xiao, Yaoming Chu, Quan Lin, Haiqing Lin, Wei Yi, Jianming Cai, Peng Xue
Open systems possess unique potentials in high-precision sensing, yet the majority of previous studies rely on the spectral singularities known as “exceptional points.” Here, we theoretically propose and experimentally demonstrate universal non-Hermitian sensing in the absence of exceptional points. The scheme makes use of the intrinsic sensitivity of a non-Hermitian probe to weak external fields, which can be understood as the direct consequence of non-Hermiticity. We confirm the basic mechanism by simulating the sensor-field dynamics using photon interferometry, and, as a concrete example, demonstrate the enhanced sensing of signals encoded in the setting angle of a wave plate. While the sensitivity of the probe is ultimately limited by the measurement noise, we find the non-Hermitian sensor showing superior performance under background noises that cannot be suppressed through repetitive measurements. Our experiment opens the avenue of enhanced sensing without exceptional points, complementing existing efforts aimed at harnessing the unique features of open systems.
{"title":"Non-Hermitian Sensing in the Absence of Exceptional Points","authors":"Lei Xiao, Yaoming Chu, Quan Lin, Haiqing Lin, Wei Yi, Jianming Cai, Peng Xue","doi":"10.1103/physrevlett.133.180801","DOIUrl":"https://doi.org/10.1103/physrevlett.133.180801","url":null,"abstract":"Open systems possess unique potentials in high-precision sensing, yet the majority of previous studies rely on the spectral singularities known as “exceptional points.” Here, we theoretically propose and experimentally demonstrate universal non-Hermitian sensing in the absence of exceptional points. The scheme makes use of the intrinsic sensitivity of a non-Hermitian probe to weak external fields, which can be understood as the direct consequence of non-Hermiticity. We confirm the basic mechanism by simulating the sensor-field dynamics using photon interferometry, and, as a concrete example, demonstrate the enhanced sensing of signals encoded in the setting angle of a wave plate. While the sensitivity of the probe is ultimately limited by the measurement noise, we find the non-Hermitian sensor showing superior performance under background noises that cannot be suppressed through repetitive measurements. Our experiment opens the avenue of enhanced sensing without exceptional points, complementing existing efforts aimed at harnessing the unique features of open systems.","PeriodicalId":20069,"journal":{"name":"Physical review letters","volume":"16 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142562312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We report the observation of a two-dimensional (2D) dam break flow of a photon fluid in a nonlinear optical crystal. By precisely shaping the amplitude and phase of the input wave, we investigate the transition from one-dimensional (1D) to 2D nonlinear dynamics. We observe wave breaking in both transverse spatial dimensions with characteristic timescales determined by the aspect ratio of the input box–shaped field. The interaction of dispersive shock waves propagating in orthogonal directions gives rise to a 2D ensemble of solitons. Depending on the box size, we report the evidence of a dynamic phase characterized by a constant number of solitons, resembling a 1D soliton gas in integrable systems. We measure the statistical features of this gaslike phase. Our findings pave the way to the investigation of collective solitonic phenomena in two dimensions, demonstrating that the loss of integrability does not disrupt the dominant phenomenology.
{"title":"Observation of Two-Dimensional Dam Break Flow and a Gaseous Phase of Solitons in a Photon Fluid","authors":"Ludovica Dieli, Davide Pierangeli, Eugenio DelRe, Claudio Conti","doi":"10.1103/physrevlett.133.183801","DOIUrl":"https://doi.org/10.1103/physrevlett.133.183801","url":null,"abstract":"We report the observation of a two-dimensional (2D) dam break flow of a photon fluid in a nonlinear optical crystal. By precisely shaping the amplitude and phase of the input wave, we investigate the transition from one-dimensional (1D) to 2D nonlinear dynamics. We observe wave breaking in both transverse spatial dimensions with characteristic timescales determined by the aspect ratio of the input box–shaped field. The interaction of dispersive shock waves propagating in orthogonal directions gives rise to a 2D ensemble of solitons. Depending on the box size, we report the evidence of a dynamic phase characterized by a constant number of solitons, resembling a 1D soliton gas in integrable systems. We measure the statistical features of this gaslike phase. Our findings pave the way to the investigation of collective solitonic phenomena in two dimensions, demonstrating that the loss of integrability does not disrupt the dominant phenomenology.","PeriodicalId":20069,"journal":{"name":"Physical review letters","volume":"15 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142556439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-28DOI: 10.1103/physrevlett.133.180401
Zhibo Niu, Yang Wu, Yunhan Wang, Xing Rong, Jiangfeng Du
Ergotropy is defined as the maximum amount of work that can be extracted through a unitary cyclic evolution. It plays a crucial role in assessing the work capacity of a quantum system. Recently, the significance of quantum coherence in work extraction has been theoretically identified, revealing that quantum states with more coherence possess more ergotropy compared to their dephased counterparts. However, an experimental study of the coherent ergotropy remains absent. Here, we report an experimental investigation of the coherent ergotropy in a single spin system. Based on the method of measuring ergotropy with an ancilla qubit, both the coherent and incoherent components of the ergotropy for the nonequilibrium state were successfully extracted. The increase in ergotropy induced by the increase in the coherence of the system was observed by varying the coherence of the state. Our work reveals the interplay between quantum thermodynamics and quantum information theory, future investigations could further explore the role other quantum attributes play in thermodynamic protocols.
{"title":"Experimental Investigation of Coherent Ergotropy in a Single Spin System","authors":"Zhibo Niu, Yang Wu, Yunhan Wang, Xing Rong, Jiangfeng Du","doi":"10.1103/physrevlett.133.180401","DOIUrl":"https://doi.org/10.1103/physrevlett.133.180401","url":null,"abstract":"Ergotropy is defined as the maximum amount of work that can be extracted through a unitary cyclic evolution. It plays a crucial role in assessing the work capacity of a quantum system. Recently, the significance of quantum coherence in work extraction has been theoretically identified, revealing that quantum states with more coherence possess more ergotropy compared to their dephased counterparts. However, an experimental study of the coherent ergotropy remains absent. Here, we report an experimental investigation of the coherent ergotropy in a single spin system. Based on the method of measuring ergotropy with an ancilla qubit, both the coherent and incoherent components of the ergotropy for the nonequilibrium state were successfully extracted. The increase in ergotropy induced by the increase in the coherence of the system was observed by varying the coherence of the state. Our work reveals the interplay between quantum thermodynamics and quantum information theory, future investigations could further explore the role other quantum attributes play in thermodynamic protocols.","PeriodicalId":20069,"journal":{"name":"Physical review letters","volume":"67 1","pages":""},"PeriodicalIF":8.6,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142556435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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