Linear optical implementation of optimal unambiguous discrimination among quantum states
Lu Jing(卢竞)a), Zhou Lan(周兰)a)b), and Kuang Le-Man(匡乐满)a)†
a Department of Physics, Hunan Normal University, Changsha 410081, China; b Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080,China
Abstract In this paper, we present a linear optical scheme for optimal unambiguous discrimination among nonorthogonal quantum states in terms of the multiple-rail and polarization representation of a single photon. In our scheme, discriminated quantum states are expressed by using the spatial degree of freedom of a single photon while the polarization degree of freedom of the single photon is used to act as an auxiliary qubit. The optical components used in our scheme are only passive linear optical elements such as polarizing beam splitters, wave plates, polarizers, single photon detectors, and single photon source.
Received: 03 February 2006
Revised: 10 May 2006
Accepted manuscript online:
PACS:
45.05.+x
(General theory of classical mechanics of discrete systems)
Fund: Project supported by the National
Fundamental Research Program (Grant No 2001CB309310), the National
Natural Science Foundation of China (Grant Nos 90203018 and
10325523), the Scientific Research Fund of Hunan Provincial
Education Department of China (Grant No 04C385), the Natural Science
Foundation of Hunan Province of China (Grant No 05JJ30012) and
the Science Foundation of Hunan Normal University of China.
Cite this article:
Lu Jing(卢竞), Zhou Lan(周兰), and Kuang Le-Man(匡乐满) Linear optical implementation of optimal unambiguous discrimination among quantum states 2006 Chinese Physics 15 1941
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