PRX quantum : a Physical Review journal最新文献_第8页

Thermodynamics of Quantum Information in Noisy Polarizers 含噪声极化器中量子信息的热力学

PRX quantum : a Physical Review journal Pub Date : 2022-12-01 DOI: 10.1103/prxquantum.4.020343

M. Aifer, Nathan M. Myers, Sebastian Deffner

引用次数: 0

Long-Time Equilibration Can Determine Transient Thermality 长时间的平衡可以确定瞬态热

PRX quantum : a Physical Review journal Pub Date : 2022-12-01 DOI: 10.1103/PRXQuantum.4.030321

K. Hovhannisyan, S. Nemati, C. Henkel, J. Anders

引用次数: 1

Symmetry of Open Quantum Systems: Classification of Dissipative Quantum Chaos 开放量子系统的对称性：耗散量子混沌的分类

PRX quantum : a Physical Review journal Pub Date : 2022-12-01 DOI: 10.1103/PRXQuantum.4.030328

K. Kawabata, A. Kulkarni, Jiachen Li, Tokiro Numasawa, S. Ryu

{"title":"Symmetry of Open Quantum Systems: Classification of Dissipative Quantum Chaos","authors":"K. Kawabata, A. Kulkarni, Jiachen Li, Tokiro Numasawa, S. Ryu","doi":"10.1103/PRXQuantum.4.030328","DOIUrl":"https://doi.org/10.1103/PRXQuantum.4.030328","url":null,"abstract":"We develop a theory of symmetry in open quantum systems. Using the operator-state mapping, we characterize symmetry of Liouvillian superoperators for the open quantum dynamics by symmetry of operators in the double Hilbert space and apply the 38-fold internal-symmetry classification of non-Hermitian operators. We find rich symmetry classification due to the interplay between symmetry in the corresponding closed quantum systems and symmetry inherent in the construction of the Liouvillian superoperators. As an illustrative example of open quantum bosonic systems, we study symmetry classes of dissipative quantum spin models. For open quantum fermionic systems, we develop the $mathbb{Z}_4$ classification of fermion parity symmetry and antiunitary symmetry in the double Hilbert space, which contrasts with the $mathbb{Z}_8$ classification in closed quantum systems. We also develop the symmetry classification of open quantum fermionic many-body systems -- a dissipative generalization of the Sachdev-Ye-Kitaev (SYK) model described by the Lindblad master equation. We establish the periodic tables of the SYK Lindbladians and elucidate the difference from the SYK Hamiltonians. Furthermore, from extensive numerical calculations, we study its complex-spectral statistics and demonstrate dissipative quantum chaos enriched by symmetry.","PeriodicalId":74587,"journal":{"name":"PRX quantum : a Physical Review journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48358587","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}

引用次数: 19

Simulating Dynamical Phases of Chiral p+ip Superconductors with a Trapped ion Magnet 用俘获离子磁铁模拟手性p+ip超导体的动态相

PRX quantum : a Physical Review journal Pub Date : 2022-11-30 DOI: 10.1103/prxquantum.3.040324

Athreya Shankar, E. Yuzbashyan, V. Gurarie, P. Zoller, J. Bollinger, A. Rey

引用次数: 0

Few-Body Analog Quantum Simulation with Rydberg-Dressed Atoms in Optical Lattices 光学晶格中rydberg修饰原子的少体模拟量子模拟

PRX quantum : a Physical Review journal Pub Date : 2022-11-28 DOI: 10.1103/PRXQuantum.4.020301

D. Malz, J. Cirac

引用次数: 3

Witnessing Nonclassicality in a Causal Structure with Three Observable Variables 在三个可观察变量的因果结构中见证非经典性

PRX quantum : a Physical Review journal Pub Date : 2022-11-23 DOI: 10.1103/PRXQuantum.4.020311

Pedro Lauand, D. Poderini, R. Nery, George Moreno, Lucas Pollyceno, R. Rabelo, R. Chaves

{"title":"Witnessing Nonclassicality in a Causal Structure with Three Observable Variables","authors":"Pedro Lauand, D. Poderini, R. Nery, George Moreno, Lucas Pollyceno, R. Rabelo, R. Chaves","doi":"10.1103/PRXQuantum.4.020311","DOIUrl":"https://doi.org/10.1103/PRXQuantum.4.020311","url":null,"abstract":"Seen from the modern lens of causal inference, Bell's theorem is nothing else than the proof that a specific classical causal model cannot explain quantum correlations. It is thus natural to move beyond Bell's paradigmatic scenario and consider different causal structures. For the specific case of three observable variables, it is known that there are three non-trivial causal networks. Two of those, are known to give rise to quantum non-classicality: the instrumental and the triangle scenarios. Here we analyze the third and remaining one, which we name the Evans scenario, akin to the causal structure underlying the entanglement-swapping experiment. We prove a number of results about this elusive scenario and introduce new and efficient computational tools for its analysis that also can be adapted to deal with more general causal structures. We do not solve its main open problem -- whether quantum non-classical correlations can arise from it -- but give a significant step in this direction by proving that post-quantum correlations, analogous to the paradigmatic Popescu-Rohrlich box, do violate the constraints imposed by a classical description of Evans causal structure.","PeriodicalId":74587,"journal":{"name":"PRX quantum : a Physical Review journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44008321","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}

引用次数: 1

Even Shorter Quantum Circuit for Phase Estimation on Early Fault-Tolerant Quantum Computers with Applications to Ground-State Energy Estimation 早期容错量子计算机相位估计的更短量子电路及其在基态能量估计中的应用

PRX quantum : a Physical Review journal Pub Date : 2022-11-22 DOI: 10.1103/PRXQuantum.4.020331

Zhiyan Ding, Lin Lin

{"title":"Even Shorter Quantum Circuit for Phase Estimation on Early Fault-Tolerant Quantum Computers with Applications to Ground-State Energy Estimation","authors":"Zhiyan Ding, Lin Lin","doi":"10.1103/PRXQuantum.4.020331","DOIUrl":"https://doi.org/10.1103/PRXQuantum.4.020331","url":null,"abstract":"We develop a phase estimation method with a distinct feature: its maximal runtime (which determines the circuit depth) is $delta/epsilon$, where $epsilon$ is the target precision, and the preconstant $delta$ can be arbitrarily close to $0$ as the initial state approaches the target eigenstate. The total cost of the algorithm satisfies the Heisenberg-limited scaling $widetilde{mathcal{O}}(epsilon^{-1})$. This is different from all previous proposals, where $delta gtrsim pi$ is required even if the initial state is an exact eigenstate. As a result, our algorithm may significantly reduce the circuit depth for performing phase estimation tasks on early fault-tolerant quantum computers. The key technique is a simple subroutine called quantum complex exponential least squares (QCELS). Our algorithm can be readily applied to reduce the circuit depth for estimating the ground-state energy of a quantum Hamiltonian, when the overlap between the initial state and the ground state is large. If this initial overlap is small, we can combine our method with the Fourier filtering method developed in [Lin, Tong, PRX Quantum 3, 010318, 2022], and the resulting algorithm provably reduces the circuit depth in the presence of a large relative overlap compared to $epsilon$. The relative overlap condition is similar to a spectral gap assumption, but it is aware of the information in the initial state and is therefore applicable to certain Hamiltonians with small spectral gaps. We observe that the circuit depth can be reduced by around two orders of magnitude in numerical experiments under various settings.","PeriodicalId":74587,"journal":{"name":"PRX quantum : a Physical Review journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43855009","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}

引用次数: 22

Accelerated Weak Signal Search Using Mode Entanglement and State Swapping 利用模式纠缠和状态交换加速弱信号搜索

PRX quantum : a Physical Review journal Pub Date : 2022-11-18 DOI: 10.1103/PRXQuantum.4.020302

Yue Jiang, E. Ruddy, K. Quinlan, M. Malnou, N. Frattini, K. Lehnert

引用次数: 2

Probing the Geometry of Correlation Matrices with Randomized Measurements 用随机测量探测相关矩阵的几何

PRX quantum : a Physical Review journal Pub Date : 2022-11-17 DOI: 10.1103/PRXQuantum.4.020325

Nikolai Wyderka, A. Ketterer

引用次数: 4

Engineering and Probing Non-Abelian Chiral Spin Liquids Using Periodically Driven Ultracold Atoms 利用周期驱动超冷原子设计和探测非阿贝尔手性自旋液体

PRX quantum : a Physical Review journal Pub Date : 2022-11-17 DOI: 10.1103/PRXQuantum.4.020329

Bo Sun, N. Goldman, M. Aidelsburger, M. Bukov

引用次数: 13