Chin. Phys. Lett.  2009, Vol. 26 Issue (4): 040303    DOI: 10.1088/0256-307X/26/4/040303
GENERAL |
An Inequality Concerning Quantitative Duality in an Asymmetry Two-Way Interferometer
HAN Yang, WU Chun-Wang, WU Wei, CHEN Ping-Xing, LI Cheng-Zu
College of Science, National University of Defense Technology, Changsha 410073
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HAN Yang, WU Chun-Wang, WU Wei et al  2009 Chin. Phys. Lett. 26 040303
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Abstract We reinvestigate the measures concerning the notion of duality of a quantum system (the ``quanton'') in an asymmetry two-way interferometer. A new measure of the which-way information is introduced, which is based on the fidelity F instead of the trace distance Q of the final states of the which-way detector. An improved inequality is derived to be V2≤(R02- P2)(1-F)2, which is more stringent than the previous one of V2≤q(1-P2)(1-Q2).
Keywords: 03.67.-a      42.50.Dv     
Received: 12 January 2009      Published: 25 March 2009
PACS:  03.67.-a (Quantum information)  
  42.50.Dv (Quantum state engineering and measurements)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/26/4/040303       OR      https://cpl.iphy.ac.cn/Y2009/V26/I4/040303
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HAN Yang
WU Chun-Wang
WU Wei
CHEN Ping-Xing
LI Cheng-Zu
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