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http://hdl.handle.net/2289/5974
Title: | Quantum which-way information and fringe visibility when the detector is entangled with an ancilla |
Authors: | Tej, Prabhu J. Usha Devi, A.R. Karthik, H.S. Sudha Rajagopal, A.K. |
Issue Date: | Jun-2014 |
Publisher: | American Physical Society |
Citation: | Physical Review A, 2014, Vol. 89, p062116 |
Abstract: | Quantum-mechanical wave-particle duality is quantified in terms of a trade-off relation between the fringe visibility and the which-way distinguishability in an interference experiment. This relation was recently generalized by Banaszek et al. [Nat. Commun. 4, 2594 (2013)] when the particle is equipped with an internal degree of freedom such as spin. Here, we extend the visibility-distinguishability trade-off relation to quantum interference of a particle possessing an internal degree of freedom, when the which-way detector state is entangled with an ancillary system. We introduce an extended which-way distinguishability DE and the associated extended fringe visibility VE, satisfying the inequality D2E+V2E≤1 in this scenario. We illustrate, with the help of three specific examples, that while the which-way information inferred solely from the detector state (without ancilla) vanishes, the extended distinguishability retrievable via measurements on the detector-ancilla entangled state is nonzero. Furthermore, in all the three examples, the extended visibility and the generalized visibility (which was introduced by Banaszek et al.) match identically with each other. |
Description: | Open Access |
URI: | http://hdl.handle.net/2289/5974 |
ISSN: | 1094-1622 (Online) 1050-2947 |
Alternative Location: | http://arxiv.org/abs/1404.6065 http://dx.doi.org/10.1103/PhysRevA.89.062116 |
Copyright: | 2014 American Physical Society This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Physical Society |
Appears in Collections: | Research Papers (LAMP) |
Files in This Item:
File | Description | Size | Format | |
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2014_PhysRevA_89_062116.pdf | Open Access | 1.03 MB | Adobe PDF | View/Open |
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