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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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| Cite this article: |
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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).
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03.67.-a
42.50.Dv
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Received: 12 January 2009
Published: 25 March 2009
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| PACS: |
03.67.-a
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(Quantum information)
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42.50.Dv
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(Quantum state engineering and measurements)
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