Pub Date : 2023-10-09DOI: 10.1103/prxquantum.4.040305
Sisi Zhou, Spyridon Michalakis, Tuvia Gefen
Measurement noise is a major source of noise in quantum metrology. Here, we explore preprocessing protocols that apply quantum controls to the quantum sensor state prior to the final noisy measurement (but after the unknown parameter has been imparted), aiming to maximize the estimation precision. We define the quantum preprocessing-optimized Fisher information, which determines the ultimate precision limit for quantum sensors under measurement noise, and conduct a thorough investigation into optimal preprocessing protocols. First, we formulate the preprocessing optimization problem as a biconvex optimization using the error observable formalism, based on which we prove that unitary controls are optimal for pure states and derive analytical solutions of the optimal controls in several practically relevant cases. Then we prove that for classically mixed states (whose eigenvalues encode the unknown parameter) under commuting-operator measurements, coarse-graining controls are optimal, while unitary controls are suboptimal in certain cases. Finally, we demonstrate that in multiprobe systems where noisy measurements act independently on each probe, the noiseless precision limit can be asymptotically recovered using global controls for a wide range of quantum states and measurements. Applications to noisy Ramsey interferometry and thermometry are presented, as well as explicit circuit constructions of optimal controls.Received 20 March 2023Revised 9 August 2023Accepted 8 September 2023DOI:https://doi.org/10.1103/PRXQuantum.4.040305Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasQuantum Fisher informationQuantum fluctuations & noiseQuantum information theoryQuantum metrologyQuantum sensingQuantum Information, Science & Technology
{"title":"Optimal Protocols for Quantum Metrology with Noisy Measurements","authors":"Sisi Zhou, Spyridon Michalakis, Tuvia Gefen","doi":"10.1103/prxquantum.4.040305","DOIUrl":"https://doi.org/10.1103/prxquantum.4.040305","url":null,"abstract":"Measurement noise is a major source of noise in quantum metrology. Here, we explore preprocessing protocols that apply quantum controls to the quantum sensor state prior to the final noisy measurement (but after the unknown parameter has been imparted), aiming to maximize the estimation precision. We define the quantum preprocessing-optimized Fisher information, which determines the ultimate precision limit for quantum sensors under measurement noise, and conduct a thorough investigation into optimal preprocessing protocols. First, we formulate the preprocessing optimization problem as a biconvex optimization using the error observable formalism, based on which we prove that unitary controls are optimal for pure states and derive analytical solutions of the optimal controls in several practically relevant cases. Then we prove that for classically mixed states (whose eigenvalues encode the unknown parameter) under commuting-operator measurements, coarse-graining controls are optimal, while unitary controls are suboptimal in certain cases. Finally, we demonstrate that in multiprobe systems where noisy measurements act independently on each probe, the noiseless precision limit can be asymptotically recovered using global controls for a wide range of quantum states and measurements. Applications to noisy Ramsey interferometry and thermometry are presented, as well as explicit circuit constructions of optimal controls.Received 20 March 2023Revised 9 August 2023Accepted 8 September 2023DOI:https://doi.org/10.1103/PRXQuantum.4.040305Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasQuantum Fisher informationQuantum fluctuations & noiseQuantum information theoryQuantum metrologyQuantum sensingQuantum Information, Science & Technology","PeriodicalId":74587,"journal":{"name":"PRX quantum : a Physical Review journal","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135044290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-06DOI: 10.1103/prxquantum.4.040303
Nicholas C. Rubin, Dominic W. Berry, Fionn D. Malone, Alec F. White, Tanuj Khattar, A. Eugene DePrince, Sabrina Sicolo, Michael Küehn, Michael Kaicher, Joonho Lee, Ryan Babbush
An improvement and detailed accounting of the fault-tolerant resources required for $aphantom{rule{0}{0ex}}b$ $iphantom{rule{0}{0ex}}nphantom{rule{0}{0ex}}iphantom{rule{0}{0ex}}tphantom{rule{0}{0ex}}iphantom{rule{0}{0ex}}o$ simulation of periodic systems provides context for quantum computation in materials science.
{"title":"Fault-Tolerant Quantum Simulation of Materials Using Bloch Orbitals","authors":"Nicholas C. Rubin, Dominic W. Berry, Fionn D. Malone, Alec F. White, Tanuj Khattar, A. Eugene DePrince, Sabrina Sicolo, Michael Küehn, Michael Kaicher, Joonho Lee, Ryan Babbush","doi":"10.1103/prxquantum.4.040303","DOIUrl":"https://doi.org/10.1103/prxquantum.4.040303","url":null,"abstract":"An improvement and detailed accounting of the fault-tolerant resources required for $aphantom{rule{0}{0ex}}b$ $iphantom{rule{0}{0ex}}nphantom{rule{0}{0ex}}iphantom{rule{0}{0ex}}tphantom{rule{0}{0ex}}iphantom{rule{0}{0ex}}o$ simulation of periodic systems provides context for quantum computation in materials science.","PeriodicalId":74587,"journal":{"name":"PRX quantum : a Physical Review journal","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135302290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-06DOI: 10.1103/prxquantum.4.040304
Jakub Czartowski, A. de Oliveira Junior, Kamil Korzekwa
We develop a resource-theoretic framework that allows one to bridge the gap between two approaches to quantum thermodynamics based on Markovian thermal processes (which model memoryless dynamics) and thermal operations (which model arbitrarily non-Markovian dynamics). Our approach is built on the notion of memory-assisted Markovian thermal processes, where memoryless thermodynamic processes are promoted to non-Markovianity by explicitly modeling ancillary memory systems initialized in thermal equilibrium states. Within this setting, we propose a family of protocols composed of sequences of elementary two-level thermalizations that approximate all transitions between energy-incoherent states accessible via thermal operations. We prove that, as the size of the memory increases, these approximations become arbitrarily good for all transitions in the infinite temperature limit, and for a subset of transitions in the finite temperature regime. Furthermore, we present solid numerical evidence for the convergence of our protocol to any transition at finite temperatures. We also explain how our framework can be used to quantify the role played by memory effects in thermodynamic protocols such as work extraction. Finally, our results show that elementary control over two energy levels at a given time is sufficient to generate all energy-incoherent transitions accessible via thermal operations if one allows for ancillary thermal systems.7 MoreReceived 5 April 2023Revised 9 August 2023Accepted 6 September 2023DOI:https://doi.org/10.1103/PRXQuantum.4.040304Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasOpen quantum systemsQuantum thermodynamicsResource theoriesTechniquesQuantum master equationQuantum Information, Science & Technology
{"title":"Thermal Recall: Memory-Assisted Markovian Thermal Processes","authors":"Jakub Czartowski, A. de Oliveira Junior, Kamil Korzekwa","doi":"10.1103/prxquantum.4.040304","DOIUrl":"https://doi.org/10.1103/prxquantum.4.040304","url":null,"abstract":"We develop a resource-theoretic framework that allows one to bridge the gap between two approaches to quantum thermodynamics based on Markovian thermal processes (which model memoryless dynamics) and thermal operations (which model arbitrarily non-Markovian dynamics). Our approach is built on the notion of memory-assisted Markovian thermal processes, where memoryless thermodynamic processes are promoted to non-Markovianity by explicitly modeling ancillary memory systems initialized in thermal equilibrium states. Within this setting, we propose a family of protocols composed of sequences of elementary two-level thermalizations that approximate all transitions between energy-incoherent states accessible via thermal operations. We prove that, as the size of the memory increases, these approximations become arbitrarily good for all transitions in the infinite temperature limit, and for a subset of transitions in the finite temperature regime. Furthermore, we present solid numerical evidence for the convergence of our protocol to any transition at finite temperatures. We also explain how our framework can be used to quantify the role played by memory effects in thermodynamic protocols such as work extraction. Finally, our results show that elementary control over two energy levels at a given time is sufficient to generate all energy-incoherent transitions accessible via thermal operations if one allows for ancillary thermal systems.7 MoreReceived 5 April 2023Revised 9 August 2023Accepted 6 September 2023DOI:https://doi.org/10.1103/PRXQuantum.4.040304Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasOpen quantum systemsQuantum thermodynamicsResource theoriesTechniquesQuantum master equationQuantum Information, Science & Technology","PeriodicalId":74587,"journal":{"name":"PRX quantum : a Physical Review journal","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135352007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-04DOI: 10.1103/prxquantum.4.040302
Matija Medvidović, Dries Sels
Classical variational methods are used to simulate the dynamics of two-dimensional quantum models with continuous degrees of freedom using neural networks, pushing the limits of classical computation in simulating these systems.
{"title":"Variational Quantum Dynamics of Two-Dimensional Rotor Models","authors":"Matija Medvidović, Dries Sels","doi":"10.1103/prxquantum.4.040302","DOIUrl":"https://doi.org/10.1103/prxquantum.4.040302","url":null,"abstract":"Classical variational methods are used to simulate the dynamics of two-dimensional quantum models with continuous degrees of freedom using neural networks, pushing the limits of classical computation in simulating these systems.","PeriodicalId":74587,"journal":{"name":"PRX quantum : a Physical Review journal","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135590667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-02DOI: 10.1103/prxquantum.4.040301
Isaac B.W. Harris, Cathryn P. Michaels, Kevin C. Chen, Ryan A. Parker, Michael Titze, Jesús Arjona Martínez, Madison Sutula, Ian R. Christen, Alexander M. Stramma, William Roth, Carola M. Purser, Martin Hayhurst Appel, Chao Li, Matthew E. Trusheim, Nicola L. Palmer, Matthew L. Markham, Edward S. Bielejec, Mete Atatüre, Dirk Englund
A quantum register coupled to a spin-photon interface is a key component in quantum communication and information processing. Group-IV color centers in diamond (SiV−, GeV−, and SnV−) are promising candidates for this application, comprising an electronic spin with optical transitions coupled to a nuclear spin as the quantum register. However, the creation of a quantum register for these color centers with deterministic and strong coupling to the spin-photon interface remains challenging. Here, we make first-principles predictions of the hyperfine parameters of the group-IV color centers, which we verify experimentally with a comprehensive comparison between the spectra of spin active and spin neutral intrinsic dopant nuclei in single GeV− and SnV− emitters. In line with the theoretical predictions, detailed spectroscopy on large sample sizes reveals that hyperfine coupling causes a splitting of the optical transition of SnV− an order of magnitude larger than the optical line width and provides a magnetic field insensitive transition. This strong coupling provides access to a new regime for quantum registers in diamond color centers, opening avenues for novel spin-photon entanglement and quantum sensing schemes for these well-studied emitters.3 MoreReceived 6 June 2023Accepted 7 August 2023DOI:https://doi.org/10.1103/PRXQuantum.4.040301Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasFirst-principles calculationsQuantum communication, protocols & technologyQuantum Information, Science & TechnologyCondensed Matter, Materials & Applied Physics
{"title":"Hyperfine Spectroscopy of Isotopically Engineered Group-IV Color Centers in Diamond","authors":"Isaac B.W. Harris, Cathryn P. Michaels, Kevin C. Chen, Ryan A. Parker, Michael Titze, Jesús Arjona Martínez, Madison Sutula, Ian R. Christen, Alexander M. Stramma, William Roth, Carola M. Purser, Martin Hayhurst Appel, Chao Li, Matthew E. Trusheim, Nicola L. Palmer, Matthew L. Markham, Edward S. Bielejec, Mete Atatüre, Dirk Englund","doi":"10.1103/prxquantum.4.040301","DOIUrl":"https://doi.org/10.1103/prxquantum.4.040301","url":null,"abstract":"A quantum register coupled to a spin-photon interface is a key component in quantum communication and information processing. Group-IV color centers in diamond (SiV−, GeV−, and SnV−) are promising candidates for this application, comprising an electronic spin with optical transitions coupled to a nuclear spin as the quantum register. However, the creation of a quantum register for these color centers with deterministic and strong coupling to the spin-photon interface remains challenging. Here, we make first-principles predictions of the hyperfine parameters of the group-IV color centers, which we verify experimentally with a comprehensive comparison between the spectra of spin active and spin neutral intrinsic dopant nuclei in single GeV− and SnV− emitters. In line with the theoretical predictions, detailed spectroscopy on large sample sizes reveals that hyperfine coupling causes a splitting of the optical transition of SnV− an order of magnitude larger than the optical line width and provides a magnetic field insensitive transition. This strong coupling provides access to a new regime for quantum registers in diamond color centers, opening avenues for novel spin-photon entanglement and quantum sensing schemes for these well-studied emitters.3 MoreReceived 6 June 2023Accepted 7 August 2023DOI:https://doi.org/10.1103/PRXQuantum.4.040301Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasFirst-principles calculationsQuantum communication, protocols & technologyQuantum Information, Science & TechnologyCondensed Matter, Materials & Applied Physics","PeriodicalId":74587,"journal":{"name":"PRX quantum : a Physical Review journal","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135828675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-29DOI: 10.1103/prxquantum.4.030341
Charles Stahl
Recent work has shown that a self-correcting quantum memory can exist in three spatial dimensions, provided that it is protected by a 1-form symmetry. Requiring that the dynamics of a system obey this type of symmetry is equivalent to enforcing a macroscopic number of symmetry terms throughout the bulk. In this paper, we show how to replace the explicit 1-form symmetry with an emergent 1-form symmetry in the bulk and an explicit 1-form symmetry on the boundary. To do so, we use the extended excitations of a three-dimensional (3D) toric code to confine anyons in a two-dimensional (2D) toric code on the boundary. The boundary anyons are bound to the bulk excitations by the explicit 1-form symmetry. Although the symmetry still has to be explicitly enforced on the boundary, this could conceivably be a more attainable constraint due to the accessibility of the boundary qubits. Furthermore, this only requires O(L2) terms for a system of linear size L, instead of O(L3) terms.4 MoreReceived 24 June 2022Revised 18 July 2023Accepted 6 September 2023DOI:https://doi.org/10.1103/PRXQuantum.4.030341Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasQuantum error correctionQuantum memoriesTopological orderQuantum Information, Science & TechnologyCondensed Matter, Materials & Applied Physics
{"title":"Self-Correction from Higher-Form Symmetry Protection on a Boundary","authors":"Charles Stahl","doi":"10.1103/prxquantum.4.030341","DOIUrl":"https://doi.org/10.1103/prxquantum.4.030341","url":null,"abstract":"Recent work has shown that a self-correcting quantum memory can exist in three spatial dimensions, provided that it is protected by a 1-form symmetry. Requiring that the dynamics of a system obey this type of symmetry is equivalent to enforcing a macroscopic number of symmetry terms throughout the bulk. In this paper, we show how to replace the explicit 1-form symmetry with an emergent 1-form symmetry in the bulk and an explicit 1-form symmetry on the boundary. To do so, we use the extended excitations of a three-dimensional (3D) toric code to confine anyons in a two-dimensional (2D) toric code on the boundary. The boundary anyons are bound to the bulk excitations by the explicit 1-form symmetry. Although the symmetry still has to be explicitly enforced on the boundary, this could conceivably be a more attainable constraint due to the accessibility of the boundary qubits. Furthermore, this only requires O(L2) terms for a system of linear size L, instead of O(L3) terms.4 MoreReceived 24 June 2022Revised 18 July 2023Accepted 6 September 2023DOI:https://doi.org/10.1103/PRXQuantum.4.030341Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasQuantum error correctionQuantum memoriesTopological orderQuantum Information, Science & TechnologyCondensed Matter, Materials & Applied Physics","PeriodicalId":74587,"journal":{"name":"PRX quantum : a Physical Review journal","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135245921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-27DOI: 10.1103/prxquantum.4.030340
Hui Zhang, Lingxiao Wan, Stefano Paesani, Anthony Laing, Yuzhi Shi, Hong Cai, Xianshu Luo, Guo-Qiang Lo, Leong Chuan Kwek, Ai Qun Liu
Integrated photonics provides a versatile platform for encoding and processing quantum information. However, the encoded quantum states are sensitive to noise, which limits their capability to perform complicated quantum computations. Here, we use a five-qubit linear cluster state on a silicon photonic chip to implement a quantum error-correction code and demonstrate its capability of identifying and correcting a single-qubit error. The encoded quantum information is reconstructed from a single-qubit error and an average state fidelity of 0.863±0.032 is achieved for different input states. We further extend the scheme to demonstrate a fault-tolerant measurement-based quantum computation (MBQC) on stabilizer formalism that allows us to redo the qubit operation against the failure of the teleportation process. Our work provides a proof-of-concept working prototype of error correction and MBQC in an integrated photonic chip.3 MoreReceived 30 April 2023Accepted 5 September 2023DOI:https://doi.org/10.1103/PRXQuantum.4.030340Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasMeasurement-based quantum computingOptical quantum information processingQuantum error correctionQuantum Information, Science & Technology
{"title":"Encoding Error Correction in an Integrated Photonic Chip","authors":"Hui Zhang, Lingxiao Wan, Stefano Paesani, Anthony Laing, Yuzhi Shi, Hong Cai, Xianshu Luo, Guo-Qiang Lo, Leong Chuan Kwek, Ai Qun Liu","doi":"10.1103/prxquantum.4.030340","DOIUrl":"https://doi.org/10.1103/prxquantum.4.030340","url":null,"abstract":"Integrated photonics provides a versatile platform for encoding and processing quantum information. However, the encoded quantum states are sensitive to noise, which limits their capability to perform complicated quantum computations. Here, we use a five-qubit linear cluster state on a silicon photonic chip to implement a quantum error-correction code and demonstrate its capability of identifying and correcting a single-qubit error. The encoded quantum information is reconstructed from a single-qubit error and an average state fidelity of 0.863±0.032 is achieved for different input states. We further extend the scheme to demonstrate a fault-tolerant measurement-based quantum computation (MBQC) on stabilizer formalism that allows us to redo the qubit operation against the failure of the teleportation process. Our work provides a proof-of-concept working prototype of error correction and MBQC in an integrated photonic chip.3 MoreReceived 30 April 2023Accepted 5 September 2023DOI:https://doi.org/10.1103/PRXQuantum.4.030340Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasMeasurement-based quantum computingOptical quantum information processingQuantum error correctionQuantum Information, Science & Technology","PeriodicalId":74587,"journal":{"name":"PRX quantum : a Physical Review journal","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135535315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-22DOI: 10.1103/prxquantum.4.030339
Bassel Heiba Elfeky, William M. Strickland, Jaewoo Lee, James T. Farmer, Sadman Shanto, Azarin Zarassi, Dylan Langone, Maxim G. Vavilov, Eli M. Levenson-Falk, Javad Shabani
Quasiparticle (QP) effects play a significant role in the coherence and fidelity of superconducting quantum circuits. The Andreev bound states of high-transparency Josephson junctions can act as low-energy traps for QPs, providing a mechanism for studying the dynamics and properties of both the QPs and the junction. Using locally injected and thermal QPs, we study QP loss and QP poisoning in epitaxial Al-InAs Josephson junctions incorporated in a superconducting quantum interference device (SQUID) galvanically shorting a superconducting resonator to ground. We observe changes in the resonance line shape and frequency shifts consistent with QP trapping into and clearing out of the ABSs of the junctions when the junctions are phase biased. By monitoring the QP trapping and clearing mechanisms in time, we find a time scale of O(1μs) for these QP dynamics, consistent with the presence of phonon-mediated QP-QP interactions. Our measurements suggest that electron-phonon interactions play a significant role in the relaxation mechanisms of our system, while electron-photon interactions and electron-phonon interactions govern the clearing mechanisms. Our results highlight the QP-induced dissipation and complex QP dynamics in superconducting quantum circuits fabricated on superconductor-semiconductor heterostructures.5 MoreReceived 16 March 2023Accepted 18 August 2023DOI:https://doi.org/10.1103/PRXQuantum.4.030339Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasMajorana bound statesQuasiparticles & collective excitationsPhysical SystemsSQUIDSemiconductorsSuperconducting devicesQuantum Information, Science & TechnologyCondensed Matter, Materials & Applied Physics
{"title":"Quasiparticle Dynamics in Epitaxial Al - InAs Planar Josephson Junctions","authors":"Bassel Heiba Elfeky, William M. Strickland, Jaewoo Lee, James T. Farmer, Sadman Shanto, Azarin Zarassi, Dylan Langone, Maxim G. Vavilov, Eli M. Levenson-Falk, Javad Shabani","doi":"10.1103/prxquantum.4.030339","DOIUrl":"https://doi.org/10.1103/prxquantum.4.030339","url":null,"abstract":"Quasiparticle (QP) effects play a significant role in the coherence and fidelity of superconducting quantum circuits. The Andreev bound states of high-transparency Josephson junctions can act as low-energy traps for QPs, providing a mechanism for studying the dynamics and properties of both the QPs and the junction. Using locally injected and thermal QPs, we study QP loss and QP poisoning in epitaxial Al-InAs Josephson junctions incorporated in a superconducting quantum interference device (SQUID) galvanically shorting a superconducting resonator to ground. We observe changes in the resonance line shape and frequency shifts consistent with QP trapping into and clearing out of the ABSs of the junctions when the junctions are phase biased. By monitoring the QP trapping and clearing mechanisms in time, we find a time scale of O(1μs) for these QP dynamics, consistent with the presence of phonon-mediated QP-QP interactions. Our measurements suggest that electron-phonon interactions play a significant role in the relaxation mechanisms of our system, while electron-photon interactions and electron-phonon interactions govern the clearing mechanisms. Our results highlight the QP-induced dissipation and complex QP dynamics in superconducting quantum circuits fabricated on superconductor-semiconductor heterostructures.5 MoreReceived 16 March 2023Accepted 18 August 2023DOI:https://doi.org/10.1103/PRXQuantum.4.030339Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasMajorana bound statesQuasiparticles & collective excitationsPhysical SystemsSQUIDSemiconductorsSuperconducting devicesQuantum Information, Science & TechnologyCondensed Matter, Materials & Applied Physics","PeriodicalId":74587,"journal":{"name":"PRX quantum : a Physical Review journal","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136058799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-20DOI: 10.1103/prxquantum.4.030338
Eric Huang, Arthur Pesah, Christopher T. Chubb, Michael Vasmer, Arpit Dua
A weight-reduction technique allows the tailoring of various three-dimensional topological codes for enhanced storage performance and demystifies the occurrence of a 50 percent threshold for infinitely biased Pauli noise.
一种减重技术允许裁剪各种三维拓扑代码以增强存储性能，并消除了无限偏泡利噪声50%阈值的神秘性。
{"title":"Tailoring Three-Dimensional Topological Codes for Biased Noise","authors":"Eric Huang, Arthur Pesah, Christopher T. Chubb, Michael Vasmer, Arpit Dua","doi":"10.1103/prxquantum.4.030338","DOIUrl":"https://doi.org/10.1103/prxquantum.4.030338","url":null,"abstract":"A weight-reduction technique allows the tailoring of various three-dimensional topological codes for enhanced storage performance and demystifies the occurrence of a 50 percent threshold for infinitely biased Pauli noise.","PeriodicalId":74587,"journal":{"name":"PRX quantum : a Physical Review journal","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136313594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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