Pub Date : 2024-09-06DOI: 10.1038/s41567-024-02617-7
Ruixiao Yao, Sungjae Chi, Biswaroop Mukherjee, Airlia Shaffer, Martin Zwierlein, Richard J. Fletcher
The frictionless directional propagation of particles at the boundary of topological materials is a striking transport phenomenon. These chiral edge modes lie at the heart of the integer and fractional quantum Hall effects, and their robustness against noise and disorder reflects the quantization of Hall conductivity in these systems. Despite their importance, the controllable injection of edge modes, and direct imaging of their propagation, structure and dynamics, remains challenging. Here we demonstrate the distillation of chiral edge modes in a rapidly rotating bosonic superfluid confined by an optical boundary. By tuning the wall sharpness, we reveal the smooth crossover between soft wall behaviour in which the propagation speed is proportional to wall steepness and the hard wall regime that exhibits chiral free particles. From the skipping motion of atoms along the boundary we infer the energy gap between the ground and first excited edge bands, and reveal its evolution from the bulk Landau level splitting for a soft boundary to the hard wall limit. Finally, we demonstrate the robustness of edge propagation against disorder by projecting an optical obstacle that is static in the rotating frame. Edge modes are a key feature of topological materials, but their propagation is difficult to directly observe in condensed matter systems. The controlled injection and propagation of chiral edge modes has now been shown in a rotating ultracold gas.
{"title":"Observation of chiral edge transport in a rapidly rotating quantum gas","authors":"Ruixiao Yao, Sungjae Chi, Biswaroop Mukherjee, Airlia Shaffer, Martin Zwierlein, Richard J. Fletcher","doi":"10.1038/s41567-024-02617-7","DOIUrl":"10.1038/s41567-024-02617-7","url":null,"abstract":"The frictionless directional propagation of particles at the boundary of topological materials is a striking transport phenomenon. These chiral edge modes lie at the heart of the integer and fractional quantum Hall effects, and their robustness against noise and disorder reflects the quantization of Hall conductivity in these systems. Despite their importance, the controllable injection of edge modes, and direct imaging of their propagation, structure and dynamics, remains challenging. Here we demonstrate the distillation of chiral edge modes in a rapidly rotating bosonic superfluid confined by an optical boundary. By tuning the wall sharpness, we reveal the smooth crossover between soft wall behaviour in which the propagation speed is proportional to wall steepness and the hard wall regime that exhibits chiral free particles. From the skipping motion of atoms along the boundary we infer the energy gap between the ground and first excited edge bands, and reveal its evolution from the bulk Landau level splitting for a soft boundary to the hard wall limit. Finally, we demonstrate the robustness of edge propagation against disorder by projecting an optical obstacle that is static in the rotating frame. Edge modes are a key feature of topological materials, but their propagation is difficult to directly observe in condensed matter systems. The controlled injection and propagation of chiral edge modes has now been shown in a rotating ultracold gas.","PeriodicalId":19100,"journal":{"name":"Nature Physics","volume":"20 11","pages":"1726-1731"},"PeriodicalIF":17.6,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142142384","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 : 2024-09-03DOI: 10.1038/s41567-024-02621-x
Jinmin Yi, Weicheng Ye, Daniel Gottesman, Zi-Wen Liu
Some form of quantum error correction is necessary to produce large-scale fault-tolerant quantum computers and finds broad relevance in physics. Most studies customarily assume exact correction. However, codes that may only enable approximate quantum error correction (AQEC) could be useful and intrinsically important in many practical and physical contexts. Here we establish rigorous connections between quantum circuit complexity and AQEC capability. Our analysis covers systems with both all-to-all connectivity and geometric scenarios like lattice systems. To this end, we introduce a type of code parameter that we call subsystem variance, which is closely related to the optimal AQEC precision. For a code encoding k logical qubits in n physical qubits, we find that if the subsystem variance is below an O(k/n) threshold, then any state in the code subspace must obey certain circuit complexity lower bounds, which identify non-trivial phases of codes. This theory of AQEC provides a versatile framework for understanding quantum complexity and order in many-body quantum systems, generating new insights for wide-ranging important physical scenarios such as topological order and critical quantum systems. Our results suggest that O(1/n) represents a common, physically profound scaling threshold of subsystem variance for features associated with non-trivial quantum order. Approximate—rather than exact—quantum error correction is a useful but relatively unexplored idea in quantum computing and many-body physics. A theoretical framework has now been established based on connections with quantum circuit complexity.
某种形式的量子纠错是生产大规模容错量子计算机所必需的，并在物理学中具有广泛的相关性。大多数研究通常假定存在精确纠错。然而，只能实现近似量子纠错（AQEC）的代码在许多实际和物理环境中可能是有用的，而且具有内在的重要性。在这里，我们在量子电路复杂性和 AQEC 能力之间建立了严格的联系。我们的分析涵盖了具有全对全连接性的系统和几何场景（如晶格系统）。为此，我们引入了一种代码参数，称之为子系统方差，它与最佳 AQEC 精度密切相关。对于在 n 个物理量子比特中编码 k 个逻辑量子比特的代码，我们发现，如果子系统方差低于 O(k/n) 门限，那么代码子空间中的任何状态都必须服从某些电路复杂度下限，而这些电路复杂度下限可以确定代码的非琐碎阶段。这种 AQEC 理论为理解多体量子系统中的量子复杂性和有序性提供了一个通用框架，为拓扑有序和临界量子系统等广泛的重要物理场景提供了新的见解。我们的研究结果表明，O(1/n) 代表了与非琐碎量子秩序相关特征的子系统方差的一个常见的、物理意义深远的缩放阈值。
{"title":"Complexity and order in approximate quantum error-correcting codes","authors":"Jinmin Yi, Weicheng Ye, Daniel Gottesman, Zi-Wen Liu","doi":"10.1038/s41567-024-02621-x","DOIUrl":"10.1038/s41567-024-02621-x","url":null,"abstract":"Some form of quantum error correction is necessary to produce large-scale fault-tolerant quantum computers and finds broad relevance in physics. Most studies customarily assume exact correction. However, codes that may only enable approximate quantum error correction (AQEC) could be useful and intrinsically important in many practical and physical contexts. Here we establish rigorous connections between quantum circuit complexity and AQEC capability. Our analysis covers systems with both all-to-all connectivity and geometric scenarios like lattice systems. To this end, we introduce a type of code parameter that we call subsystem variance, which is closely related to the optimal AQEC precision. For a code encoding k logical qubits in n physical qubits, we find that if the subsystem variance is below an O(k/n) threshold, then any state in the code subspace must obey certain circuit complexity lower bounds, which identify non-trivial phases of codes. This theory of AQEC provides a versatile framework for understanding quantum complexity and order in many-body quantum systems, generating new insights for wide-ranging important physical scenarios such as topological order and critical quantum systems. Our results suggest that O(1/n) represents a common, physically profound scaling threshold of subsystem variance for features associated with non-trivial quantum order. Approximate—rather than exact—quantum error correction is a useful but relatively unexplored idea in quantum computing and many-body physics. A theoretical framework has now been established based on connections with quantum circuit complexity.","PeriodicalId":19100,"journal":{"name":"Nature Physics","volume":"20 11","pages":"1798-1803"},"PeriodicalIF":17.6,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142123676","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 : 2024-08-28DOI: 10.1038/s41567-024-02603-z
Michael Yannai, Matan Haller, Ron Ruimy, Alexey Gorlach, Nicholas Rivera, Dmitri N. Basov, Ido Kaminer
For several decades, optical near-field microscopy has facilitated pioneering investigations of photonic excitations at the nanoscale. In recent years, near-field microscopy of terahertz fields has emerged as an important tool for experiments involving phononic and electronic phenomena, rich spatiotemporal dynamics and highly nonlinear processes. Building on this foundation, this Perspective elucidates the transformative opportunities provided by terahertz near-field microscopy to probe ultrafast phase transitions, helping to tackle previously inaccessible challenges of condensed matter physics. Laser-driven phase transitions in many systems are accompanied by the generation of terahertz pulses with spatiotemporal features governed by the complex physics underlying the phase transition. The characterization of these emitted pulses using terahertz near-field microscopy techniques could therefore support the investigation of ultrafast phase transition dynamics. This approach could, for example, allow the observation of ultrafast topological transitions in quantum materials, showcasing its ability to clarify the dynamic processes underlying phase changes. Optical near-field microscopy has facilitated our understanding of nanophotonics. This Perspective explores the opportunities that near-field studies of terahertz fields provide for ultrafast phase transitions in condensed matter systems.
{"title":"Opportunities in nanoscale probing of laser-driven phase transitions","authors":"Michael Yannai, Matan Haller, Ron Ruimy, Alexey Gorlach, Nicholas Rivera, Dmitri N. Basov, Ido Kaminer","doi":"10.1038/s41567-024-02603-z","DOIUrl":"10.1038/s41567-024-02603-z","url":null,"abstract":"For several decades, optical near-field microscopy has facilitated pioneering investigations of photonic excitations at the nanoscale. In recent years, near-field microscopy of terahertz fields has emerged as an important tool for experiments involving phononic and electronic phenomena, rich spatiotemporal dynamics and highly nonlinear processes. Building on this foundation, this Perspective elucidates the transformative opportunities provided by terahertz near-field microscopy to probe ultrafast phase transitions, helping to tackle previously inaccessible challenges of condensed matter physics. Laser-driven phase transitions in many systems are accompanied by the generation of terahertz pulses with spatiotemporal features governed by the complex physics underlying the phase transition. The characterization of these emitted pulses using terahertz near-field microscopy techniques could therefore support the investigation of ultrafast phase transition dynamics. This approach could, for example, allow the observation of ultrafast topological transitions in quantum materials, showcasing its ability to clarify the dynamic processes underlying phase changes. Optical near-field microscopy has facilitated our understanding of nanophotonics. This Perspective explores the opportunities that near-field studies of terahertz fields provide for ultrafast phase transitions in condensed matter systems.","PeriodicalId":19100,"journal":{"name":"Nature Physics","volume":"20 9","pages":"1383-1388"},"PeriodicalIF":17.6,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142085737","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 : 2024-08-26DOI: 10.1038/s41567-024-02618-6
Zeliang Sun, Gaihua Ye, Chengkang Zhou, Mengqi Huang, Nan Huang, Xilong Xu, Qiuyang Li, Guoxin Zheng, Zhipeng Ye, Cynthia Nnokwe, Lu Li, Hui Deng, Li Yang, David Mandrus, Zi Yang Meng, Kai Sun, Chunhui Rita Du, Rui He, Liuyan Zhao
The effects of fluctuations and disorder, which are substantially enhanced in reduced dimensionalities, can play a crucial role in producing non-trivial phases of matter such as vestigial orders characterized by a composite order parameter. However, fluctuation-driven magnetic phases in low dimensions have remained relatively unexplored. Here we demonstrate a phase transition from the zigzag antiferromagnetic order in the three-dimensional bulk to a Z3 vestigial Potts nematicity in two-dimensional few-layer samples of van der Waals magnet NiPS3. Our spin relaxometry and optical spectroscopy measurements reveal that the spin fluctuations are enhanced over the gigahertz to terahertz range as the layer number of NiPS3 reduces. Monte Carlo simulations corroborate the experimental finding of threefold rotational symmetry breaking but show that the translational symmetry is restored in thin layers of NiPS3. Therefore, our results show that strong quantum fluctuations can stabilize an unconventional magnetic phase after destroying a more conventional one. Magnetic phases that are stabilized by quantum fluctuations in low dimensions are rare. A thickness-dependent crossover from three-dimensional antiferromagnetism to a two-dimensional vestigial nematic state that is driven by fluctuations has now been observed.
{"title":"Dimensionality crossover to a two-dimensional vestigial nematic state from a three-dimensional antiferromagnet in a honeycomb van der Waals magnet","authors":"Zeliang Sun, Gaihua Ye, Chengkang Zhou, Mengqi Huang, Nan Huang, Xilong Xu, Qiuyang Li, Guoxin Zheng, Zhipeng Ye, Cynthia Nnokwe, Lu Li, Hui Deng, Li Yang, David Mandrus, Zi Yang Meng, Kai Sun, Chunhui Rita Du, Rui He, Liuyan Zhao","doi":"10.1038/s41567-024-02618-6","DOIUrl":"10.1038/s41567-024-02618-6","url":null,"abstract":"The effects of fluctuations and disorder, which are substantially enhanced in reduced dimensionalities, can play a crucial role in producing non-trivial phases of matter such as vestigial orders characterized by a composite order parameter. However, fluctuation-driven magnetic phases in low dimensions have remained relatively unexplored. Here we demonstrate a phase transition from the zigzag antiferromagnetic order in the three-dimensional bulk to a Z3 vestigial Potts nematicity in two-dimensional few-layer samples of van der Waals magnet NiPS3. Our spin relaxometry and optical spectroscopy measurements reveal that the spin fluctuations are enhanced over the gigahertz to terahertz range as the layer number of NiPS3 reduces. Monte Carlo simulations corroborate the experimental finding of threefold rotational symmetry breaking but show that the translational symmetry is restored in thin layers of NiPS3. Therefore, our results show that strong quantum fluctuations can stabilize an unconventional magnetic phase after destroying a more conventional one. Magnetic phases that are stabilized by quantum fluctuations in low dimensions are rare. A thickness-dependent crossover from three-dimensional antiferromagnetism to a two-dimensional vestigial nematic state that is driven by fluctuations has now been observed.","PeriodicalId":19100,"journal":{"name":"Nature Physics","volume":"20 11","pages":"1764-1771"},"PeriodicalIF":17.6,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142084957","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 : 2024-08-21DOI: 10.1038/s41567-024-02609-7
Adolfo del Campo, Seong-Ho Shinn
The Kibble–Zurek mechanism is a key framework for describing the dynamics of continuous phase transitions. Recent experiments with ultracold gases, employing alternative methods to create a superfluid, highlight its universality.
{"title":"Universal symmetry breaking passes the superfluid test","authors":"Adolfo del Campo, Seong-Ho Shinn","doi":"10.1038/s41567-024-02609-7","DOIUrl":"10.1038/s41567-024-02609-7","url":null,"abstract":"The Kibble–Zurek mechanism is a key framework for describing the dynamics of continuous phase transitions. Recent experiments with ultracold gases, employing alternative methods to create a superfluid, highlight its universality.","PeriodicalId":19100,"journal":{"name":"Nature Physics","volume":"20 10","pages":"1523-1524"},"PeriodicalIF":17.6,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142013739","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 : 2024-08-21DOI: 10.1038/s41567-024-02615-9
Zhixin Lyu
Understanding the mechanism of bacterial cell division is important in both fundamental and applied biology. Now, researchers have investigated the self-organization of cytoskeletal filaments and the role nematic ordering plays in cell division.
{"title":"Nematic proteins on the treadmill","authors":"Zhixin Lyu","doi":"10.1038/s41567-024-02615-9","DOIUrl":"10.1038/s41567-024-02615-9","url":null,"abstract":"Understanding the mechanism of bacterial cell division is important in both fundamental and applied biology. Now, researchers have investigated the self-organization of cytoskeletal filaments and the role nematic ordering plays in cell division.","PeriodicalId":19100,"journal":{"name":"Nature Physics","volume":"20 10","pages":"1534-1535"},"PeriodicalIF":17.6,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142013740","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 : 2024-08-20DOI: 10.1038/s41567-024-02614-w
Tuomo Tanttu, Wee Han Lim, Jonathan Y. Huang, Nard Dumoulin Stuyck, Will Gilbert, Rocky Y. Su, MengKe Feng, Jesus D. Cifuentes, Amanda E. Seedhouse, Stefan K. Seritan, Corey I. Ostrove, Kenneth M. Rudinger, Ross C. C. Leon, Wister Huang, Christopher C. Escott, Kohei M. Itoh, Nikolay V. Abrosimov, Hans-Joachim Pohl, Michael L. W. Thewalt, Fay E. Hudson, Robin Blume-Kohout, Stephen D. Bartlett, Andrea Morello, Arne Laucht, Chih Hwan Yang, Andre Saraiva, Andrew S. Dzurak
Achieving high-fidelity entangling operations between qubits consistently is essential for the performance of multi-qubit systems. Solid-state platforms are particularly exposed to errors arising from materials-induced variability between qubits, which leads to performance inconsistencies. Here we study the errors in a spin qubit processor, tying them to their physical origins. We use this knowledge to demonstrate consistent and repeatable operation with above 99% fidelity of two-qubit gates in the technologically important silicon metal-oxide-semiconductor quantum dot platform. Analysis of the physical errors and fidelities in multiple devices over extended periods allows us to ensure that we capture the variation and the most common error types. Physical error sources include the slow nuclear and electrical noise on single qubits and contextual noise that depends on the applied control sequence. Furthermore, we investigate the impact of qubit design, feedback systems and robust gate design to inform the design of future scalable, high-fidelity control strategies. Our results highlight both the capabilities and challenges for the scaling-up of silicon spin-based qubits into full-scale quantum processors. For solid-state qubits, the material environment hosts sources of errors that vary in time and space. This systematic analysis of errors affecting high-fidelity two-qubit gates in silicon can inform the design of large-scale quantum computers.
{"title":"Assessment of the errors of high-fidelity two-qubit gates in silicon quantum dots","authors":"Tuomo Tanttu, Wee Han Lim, Jonathan Y. Huang, Nard Dumoulin Stuyck, Will Gilbert, Rocky Y. Su, MengKe Feng, Jesus D. Cifuentes, Amanda E. Seedhouse, Stefan K. Seritan, Corey I. Ostrove, Kenneth M. Rudinger, Ross C. C. Leon, Wister Huang, Christopher C. Escott, Kohei M. Itoh, Nikolay V. Abrosimov, Hans-Joachim Pohl, Michael L. W. Thewalt, Fay E. Hudson, Robin Blume-Kohout, Stephen D. Bartlett, Andrea Morello, Arne Laucht, Chih Hwan Yang, Andre Saraiva, Andrew S. Dzurak","doi":"10.1038/s41567-024-02614-w","DOIUrl":"10.1038/s41567-024-02614-w","url":null,"abstract":"Achieving high-fidelity entangling operations between qubits consistently is essential for the performance of multi-qubit systems. Solid-state platforms are particularly exposed to errors arising from materials-induced variability between qubits, which leads to performance inconsistencies. Here we study the errors in a spin qubit processor, tying them to their physical origins. We use this knowledge to demonstrate consistent and repeatable operation with above 99% fidelity of two-qubit gates in the technologically important silicon metal-oxide-semiconductor quantum dot platform. Analysis of the physical errors and fidelities in multiple devices over extended periods allows us to ensure that we capture the variation and the most common error types. Physical error sources include the slow nuclear and electrical noise on single qubits and contextual noise that depends on the applied control sequence. Furthermore, we investigate the impact of qubit design, feedback systems and robust gate design to inform the design of future scalable, high-fidelity control strategies. Our results highlight both the capabilities and challenges for the scaling-up of silicon spin-based qubits into full-scale quantum processors. For solid-state qubits, the material environment hosts sources of errors that vary in time and space. This systematic analysis of errors affecting high-fidelity two-qubit gates in silicon can inform the design of large-scale quantum computers.","PeriodicalId":19100,"journal":{"name":"Nature Physics","volume":"20 11","pages":"1804-1809"},"PeriodicalIF":17.6,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s41567-024-02614-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142007343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-20DOI: 10.1038/s41567-024-02619-5
Xiaowei Deng, Sai Li, Zi-Jie Chen, Zhongchu Ni, Yanyan Cai, Jiasheng Mai, Libo Zhang, Pan Zheng, Haifeng Yu, Chang-Ling Zou, Song Liu, Fei Yan, Yuan Xu, Dapeng Yu
Quantum metrology uses non-classical states, such as Fock states with a specific number of photons, to achieve an advantage over classical sensing methods. Typically, quantum metrological performance can be enhanced by increasing the involved excitation numbers, for example, by using large-photon-number Fock states. However, manipulating these states and demonstrating a quantum metrological advantage is experimentally challenging. Here we present an efficient method for generating large Fock states approaching 100 photons within a superconducting microwave cavity through the development of a programmable photon number filter. Using these states in displacement and phase measurements, we demonstrate quantum-enhanced metrology approaching the Heisenberg scaling for 40-photon Fock states and achieve a maximum metrological gain of up to 14.8 dB, highlighting the metrological advantages of large Fock states. Our study could be readily extended to mechanical and optical systems, promising potential applications in weak force detection and dark matter searches.
{"title":"Quantum-enhanced metrology with large Fock states","authors":"Xiaowei Deng, Sai Li, Zi-Jie Chen, Zhongchu Ni, Yanyan Cai, Jiasheng Mai, Libo Zhang, Pan Zheng, Haifeng Yu, Chang-Ling Zou, Song Liu, Fei Yan, Yuan Xu, Dapeng Yu","doi":"10.1038/s41567-024-02619-5","DOIUrl":"https://doi.org/10.1038/s41567-024-02619-5","url":null,"abstract":"<p>Quantum metrology uses non-classical states, such as Fock states with a specific number of photons, to achieve an advantage over classical sensing methods. Typically, quantum metrological performance can be enhanced by increasing the involved excitation numbers, for example, by using large-photon-number Fock states. However, manipulating these states and demonstrating a quantum metrological advantage is experimentally challenging. Here we present an efficient method for generating large Fock states approaching 100 photons within a superconducting microwave cavity through the development of a programmable photon number filter. Using these states in displacement and phase measurements, we demonstrate quantum-enhanced metrology approaching the Heisenberg scaling for 40-photon Fock states and achieve a maximum metrological gain of up to 14.8 dB, highlighting the metrological advantages of large Fock states. Our study could be readily extended to mechanical and optical systems, promising potential applications in weak force detection and dark matter searches.</p>","PeriodicalId":19100,"journal":{"name":"Nature Physics","volume":"5 1","pages":""},"PeriodicalIF":19.6,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142007467","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 : 2024-08-13DOI: 10.1038/s41567-024-02625-7
In light of the recent Olympic and upcoming Paralympic Summer Games in Paris, we take a closer look at the physics of sports and how it helps athletes improve their performance.
{"title":"Physics pushes peak performance","authors":"","doi":"10.1038/s41567-024-02625-7","DOIUrl":"10.1038/s41567-024-02625-7","url":null,"abstract":"In light of the recent Olympic and upcoming Paralympic Summer Games in Paris, we take a closer look at the physics of sports and how it helps athletes improve their performance.","PeriodicalId":19100,"journal":{"name":"Nature Physics","volume":"20 8","pages":"1219-1219"},"PeriodicalIF":17.6,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s41567-024-02625-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141973889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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