不同光学腔中远距离原子间量子相位门的实现

J4 ›› 2010, Vol. 27 ›› Issue (5): 554-557.

不同光学腔中远距离原子间量子相位门的实现

樊洋, 李定国

海军工程大学理学院, 湖北武汉, 430033

收稿日期:2009-10-23 修回日期:2009-11-27 出版日期:2010-09-28 发布日期:2010-08-31
通讯作者: 樊洋(1981-)，男，海军工程大学理学院讲师，研究方向为量子光学。 E-mail:ericfan626@yahoo.com.cn

Conditional quantum controlled-phase gate between distant atoms in optical cavities

FAN Yang, LI Dingguo

College of Science, Naval University of Engineering, Wuhan 430033, China

Received:2009-10-23 Revised:2009-11-27 Published:2010-09-28 Online:2010-08-31

摘要/Abstract

摘要：

提出了一个实现处在不同光学腔中的远距离原子之间的量子受控相位门方案,通过利用光子的稳定性和原子-光子在光学腔中的强耦合作用,从而得到了不同原子间的幺正演化操作。该方案不受腔中光子衰减和原子自发辐射产生的消相干影响, 从而使受控相位门操作具有高保真度。

关键词: 量子光学, 受控相位门, 腔量子电动力学, 消相干

Abstract:

A scheme to implement a quantum controlled-phase gate between two four-level atoms inside the different optical cavities is proposed. The scheme combine the advantage of scalability from the photon and the power of strong atom-photon coupling, which yields the desired unitary evolution operation. The scheme is immune to decoherence due to cavity photon decay and atomic spontaneous emission.Thus,the operation is implemented probabilistically with a very high fidelity.

Key words: quantum optics, controlled-phase gate, cavity QED, decoherence

樊洋李定国. 不同光学腔中远距离原子间量子相位门的实现[J]. J4, 2010, 27(5): 554-557.

FAN Yang, LI Dingguo. Conditional quantum controlled-phase gate between distant atoms in optical cavities[J]. J4, 2010, 27(5): 554-557.

参考文献

[1]Deutsch D. Quantum theory, the Church-Turing principle and the universal quantum computer[J].Proc. R. Soc. London, Ser. A,1985,400:97-117.
[2]Grover L K. Quantum Computers Can Search Arbitrarily Large Databases by a Single Query[J].Phys. Rev. Lett.,1995,79:4709-4712.
[3]Geng Tao,Li Gang,Wang Junming,et al.Cavity QED and quantum information process[J].Chinese Journal of Quantum Electronics(量子电子学报)，2004,21(6): 719-724 (in Chinese).
[4]Duan L M, Wang B, Kimble H J. Robust quantum gates on neutral atoms with cavity-assisted photon scattering.Phys. Rev. A, 2005,72:032333.
[5]Zou X B, Mathis W. Conditional quantum phase gate using distant atoms and linear optics.Phys. Rev. A,2005,71:042334.
[6]Zou X B, Li K, Guo G C. Linear optical scheme for direct implementation of a nondestructive N-qubit controlled phase gate[J].Phys. Rev. A,2006,74:044305.
[7]Wei H, Deng Z J, Zhang X L,et al. Transfer and teleportation of quantum states encoded in decoherence-free subspace[J].Phys. Rev. A,2007,76:054304.
[8]Xiao Y F, Zou X B,Guo G C. One-step implementation of an N-qubit controlled-phase gate with neutral atoms trapped in an optical cavity[J].Phys. Rev. A ,2007,75:054303.
[9]Xia Y, Song J,Song H S. Robust implementation of a nonlocal N-qubit phase gate by interference of polarized photons[J].Chin.Phys. Lett. ,2008,25:3150-3153.
[10] Lee J, Park J, Lee S M,et al. Scalable cavity-QED-based scheme of generating entanglement of atoms and of cavity fields[J].Phys. Rev. A,2008,77:032327.
[11] Plenio M B, Knight P L. The quantum-jump approach to dissipative dynamics in quantum optics[J].Rev.Mod.Phys.,1998,70:101-144.
[12] Kim J, Takeuchi S,Yamamoto Y. Multiphoton detection using visible light photon counter[J].Appl.Phys. Lett., 1999,74:902-904.
[13] Maunz P, Moehring D L, Olmschenk S,et al. Quantum interference of photon pairs from two remote trapped atomic ions[J].Nature Physics,2007,3:538.
[14] Raimond J M, Brune M,Haroche S. Manipulating quantum entanglement with atoms and photons in a cavity[J].Rev.Mod.Phys., 2001,73:565-582.
[15] Blinov B B, Moehring D L, Duan LM,et al. Observation of entanglement between a single trapped atom and a single photon[J].Nature,2004, 428:153-157.