Operational quasiprobabilities for qudits
- Title
- Operational quasiprobabilities for qudits
- Author
- 이진형
- Keywords
- QUANTUM-STATE TOMOGRAPHY; DISCRETE WIGNER FUNCTION; HIDDEN-VARIABLE THEORIES; BELL INEQUALITIES; MECHANICS; REALISM; THEOREM; PHASE
- Issue Date
- 2013-11
- Publisher
- AMERICAN PHYSICAL SOCIETY
- Citation
- Phys. Rev. A 88, 052123 (2013)
- Abstract
- We propose an operational quasiprobability function for qudits, enabling a comparison between quantum and hidden-variable theories. We show that the quasiprobability function becomes positive semidefinite if consecutive measurement results are described by a hidden-variable model with locality and noninvasive measurability assumed. Otherwise, it is negative valued. The negativity depends on the observables to be measured as well as a given state, as the quasiprobability function is operationally defined. We also propose a marginal quasiprobability function and show that it plays the role of an entanglement witness for two qudits. In addition, we discuss an optical experiment of a polarization qubit to demonstrate its nonclassicality in terms of the quasiprobability function.Comment: 10 pages, 4 figures, journal version
- URI
- https://journals.aps.org/pra/abstract/10.1103/PhysRevA.88.052123http://hdl.handle.net/20.500.11754/53926
- ISSN
- 1050-2947
- DOI
- 10.1103/PhysRevA.88.052123
- Appears in Collections:
- COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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