我们提出了一个操作定义的维格纳函数。我们的方法依赖于测量拉比振荡的菲涅耳变换，并适用于被困原子的运动态以及腔场态。我们用最近离子阱实验的数据来说明这种技术[D. M. Meekhof等人，物理修订信函76，1796（1996）]和腔QED [B. Varcoe等人，Nature 403，743（2000）]。振动基态和单光子数态在相空间原点的Wigner函数分别为W（0）=+1.75和W（0）=-1.4。我们将这种方法推广到任意势场中的波包。
英文摘要：
We present an operational definition of the Wigner function. Our method relies on the Fresnel transform of measured Rabi oscillations and applies to motional states of trapped atoms as well as to field states in cavities. We illustrate this technique using data from recent experiments in ion traps [D. M. Meekhof et al., Phys. Rev. Lett. 76, 1796 (1996)] and in cavity QED [B. Varcoe et al., Nature 403, 743 (2000)]. The values of the Wigner functions of the underlying states at the origin of phase space are W(0)=+1.75 for the vibrational ground state and W(0)=-1.4 for the one-photon number state. We generalize this method to wave packets in arbitrary potentials.
Operational criterion for Wigner function negativity
Università di Genova（热那亚大学）；INFN - Sezione di Genova（意大利国家核物理研究所热那亚分部）；Istituto Nazionale di Ottica del Consiglio Nazionale delle Ricerche (CNR-INO)（意大利国家研究委员会光学研究所）；European Laboratory for Non-linear Spectroscopy, Universitá di Firenze（佛罗伦萨大学欧洲非线性光谱学实验室）
Classical and quantum mechanics across representations: an operational reading of the Wigner Weyl correspondence
University of Vienna, Faculty of Physics（维也纳大学物理学院）；Vienna Center for Quantum Science and Technology（维也纳量子科学与技术中心）；Institute for Quantum Optics and Quantum Information (IQOQI), Austrian Academy of Sciences（奥地利科学院量子光学与量子信息研究所）；Constructor University（Constructor大学）；University of Geneva, Group of Applied Physics（日内瓦大学应用物理组）
The Wigner-Yanase skew information was proposed to quantify the information contained in quantum states with respect to a conserved additive quantity, and it was later extended to the Wigner-Yanase-Dyson skew informations. Recently, the Wigner-Yanase-Dyson skew informations have been recognized as valid resource measures for the resource theory of asymmetry, and their properties have been investigated from a resource-theoretic perspective. The Wigner-Yanse-Dyson skew informations have been further generalized to a class called metric-adjusted skew informations, and this general family of skew …
Despite the indisputable merits of the Wigner phase-space formulation, it has not been widely explored for systems with SU(1,1) symmetry, as a simple operational definition of the Wigner function has proved elusive in this case. We capitalize on the unique properties of the parity operator, to derive in a consistent way a \emph{bona fide} SU(1,1) Wigner function that faithfully parallels the structure of its continuous-variable counterpart. We propose an optical scheme, involving a squeezer and photon-number-resolving detectors, that allows for direct point-by-point sampling of that Wigner fun…
Radial Coarse Graining Restores Vacuum Majorization in Wigner Phase Space
School of Physical Sciences, University of Chinese Academy of Sciences（中国科学院大学物理科学学院）；ICTP-AP, University of Chinese Academy of Sciences（中国科学院大学 ICTP-AP）
We consider the Wigner quasi-probability distribution function of a single mode of an electromagnetic or matter-wave field to address the question of whether a direct stochastic sampling and binning of the absolute square of the complex field amplitude can yield a distribution function $\tilde{P}_n$ that closely approximates the true particle number probability distribution $P_n$ of the underlying quantum state. By providing an operational definition of the binned distribution $\tilde{P}_n$ in terms of the Wigner function, we explicitly calculate the overlap between $\tilde{P}_n$ and ${P}_n$ a…
We examine the interpretation of individual phase-space trajectories of the Wigner function as corresponding to possible outcomes of single experimental trials. To this end, we investigate the relation between the true (measured) particle number distribution $P_n$ for a single-mode state and that obtained by discretely binning the individual stochastic realisations of squared mode amplitudes $|α|^2$ of the sampled Wigner distribution $W(α)$, which we denote via $\tilde{P}_n$. We provide an operational definition of $\tilde{P}_n$ in terms of the underlying Wigner function, which allows us to ex…
École Normale Supérieure, PSL University（巴黎高等师范学院，巴黎文理研究大学）；INRIA（法国国家数字科学与应用研究所）；Instituto Superior Técnico（里斯本理工大学）；ISCTE - Instituto Universitário de Lisboa（里斯本大学学院）；Université libre de Bruxelles（布鲁塞尔自由大学）
Grand Unification of All Discrete Wigner Functions on $d \times d$ Phase Space
Centre for Quantum Computation and Communication Technology, School of Science, RMIT University（RMIT大学理学院量子计算与通信技术研究中心）；DIENS, École Normale Supérieure, PSL University, CNRS, INRIA（巴黎高等师范学院，PSL大学，法国国家科学研究中心，法国国家信息与自动化研究所）
Negativity of the Wigner function is arguably one of the most striking non-classical features of quantum states. Beyond its fundamental relevance, it is also a necessary resource for quantum speedup with continuous variables. As quantum technologies emerge, the need to identify and characterize the resources which provide an advantage over existing classical technologies becomes more pressing. Here we derive witnesses for Wigner negativity of single-mode and multimode quantum states, based on fidelities with Fock states, which can be reliably measured using standard detection setups. They poss…
Error and Disturbance as Irreversibility with Applications: Unified Definition, Wigner--Araki--Yanase Theorem and Out-of-Time-Order Correlator
Graduate School of Information Science and Technology, Hokkaido University（北海道大学信息理工学院）；RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS), RIKEN（理化学研究所交叉理论数学科学中心（iTHEMS））；Department of Informatics, Faculty of Information Science and Electrical Engineering, Kyushu University（九州大学信息电气工程学院信息系）；JST, FOREST（日本科学技术振兴机构，FOREST计划）
Exact Cahill-Glauber Hierarchy for the Double-Morse Ground State
Khalifa University of Science and Technology（哈利法科学技术大学）；KU Research Center for Intelligent Computing, Networks and Sensing (ICONS)（KU智能计算、网络与传感研究中心）；Institute of Physics of the Czech Academy of Sciences（捷克科学院物理研究所）
Wigner negativity and stellar rank for SU(1,1) states
Universidad de Guadalajara（瓜达拉哈拉大学）；Universidad Autónoma de Chile（智利自治大学）；Universidad Complutense（康普顿斯大学）；Max-Planck-Institut für die Physik des Lichts（马克斯·普朗克光科学研究所）；Friedrich-Alexander-Universität Erlangen-Nürnberg（埃尔朗根-纽伦堡大学）；Université Paris Cité（巴黎西岱大学）；CNRS, Astroparticule et Cosmologie（法国国家科学研究中心，天体粒子与宇宙学）；University of Białystok（比亚韦斯托克大学）；Institute for Quantum Studies, Chapman University（查普曼大学量子研究学院）
