基于线性光学系统实现量子密集编码

J4 ›› 2010, Vol. 27 ›› Issue (2): 161-166.

基于线性光学系统实现量子密集编码

万洪波叶柳

安徽大学物理与材料科学学院，安徽合肥 230039

出版日期:2010-03-28 发布日期:2010-03-05
通讯作者: 叶柳（1964- ），女，理学博士，教授，主要研究领域为量子计算与量子信息。 E-mail:yeliu@ahu.edu.cn
作者简介:万洪波（1982- ），男，安徽大学在读研究生，主要研究领域为量子计算与量子信息，E-mail:whb1982910101@sina.com
基金资助:
National Science Foundation of China (10674001) , Important Program of the Education Department of Anhui Province ( KJ2007A002)

Scheme for implementing quantum dense coding by using linear optical system

WAN Hong-Bo, YE Liu

School of Physics and Material Science, Anhui University, Hefei 230039, China

Published:2010-03-28 Online:2010-03-05
Supported by:
National Science Foundation of China (10674001) , Important Program of the Education Department of Anhui Province ( KJ2007A002)

摘要/Abstract

摘要：

在线性光学系统中，提出了一个使用三光子GHZ态实现密集编码的方案。该方案中，Alice首先对她所持有的两个光子通过线性光学元件进行编码，然后将这两个光子传送给Bob. 接收到光子后Bob使用两个QND对等探测器以及PBS光学元件对他拥有的三个光子的八个量子态进行分辨，根据测量的结果辨别出Alice对她的两个光子所进行的操作。在密集编码过程中Alice仅传送两个光子，但Bob可以获得三比特的经典信息。探测使用的QND装置建立在cross-Kerr nonlinearity基础上，目前已经可以通过电磁感应透明实现。

关键词: 量子光学, 密集编码, GHZ态, 线性光学系统

Abstract:

A novel scheme for realizing dense coding with Greenberger-Home-Zeilinger (GHZ) state in linear optical system is proposed. In this protocol, Alice codes on photon 1 and 2 by linear optical element and sents these photons to Bob. Then Bob will perform a joint measurement on photons 1, 2, and 3 with the GHZ basis by employing two quantum nondemolition detectors (QND) and polarizing beam splitter (PBS). Eight GHZ states can be completely discriminated. According to the outcomes of his measurement Bob can determine which operation Alice applied. Alice only transmits two photons in this process of the quantum dense coding, but Bob can obtain three bits of classical information. The QND devices are generally based on cross-Kerr nonlinearities, and the cross-Kerr nonlinearities have become available with electromagnetically induced transparency (EIT).

Key words: quantum optics, dense coding, GHZ-state, linear optical system

万洪波叶柳. 基于线性光学系统实现量子密集编码[J]. J4, 2010, 27(2): 161-166.

WAN Hong-Bo, YE Liu. Scheme for implementing quantum dense coding by using linear optical system[J]. J4, 2010, 27(2): 161-166.

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