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量子计算如何在实验上实现一直受到广泛关注. 包括超导Josephson结的小量子器件(如超导量子干涉仪, SQUID)是实现量子计算的一种非常具有发展前景的物理系统. 本文通过对SQUID和介观LC共振器耦合电路系统的Cooper对数-相量子化机制的讨论, 合理地调制参数, 由此导出了该耦合电路在两能级近似下的J-C模型形式, 并提出了一种基于此模型的可实现量子信息传递的方案. 根据此方案可以利用介观LC共振器为数据总线来执行两SQUID间电荷量子比特的传递.
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关键词:
- Josephson结 /
- 电荷量子比特 /
- J-C模型 /
- 量子通信
The topic about how to realize quantum computation has aroused great interest of many people. The small quantum device including Josephson junction (SQUID, e.g.) is a very promising physical system to realize quantum computation. In this paper, through the discussion about the Cooper-pair number-phase quantization scheme of the circuit system coupled by SQUID and mesoscopic LC resonator, and through the rational modulation of the parameter, we derive the J-C model of this coupled circuit under the condition of two-level approximation. According to on this model, we propose a protocol which can realize the transfer of quantum information. According to this protocol, we can carry out the transfer of the charge qubits between the two SQUIDs by utilizing the mesoscopic LC resonator as the data bus.-
Keywords:
- Josephson junction /
- charge qubit /
- J-C model /
- quantum communication
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[18] Wu S H, Hu M L, Li J, Hui X Q 2011 Acta Phys. Sin. 60 010302(in Chinese) [吴世海, 胡明亮, 李季, 惠小强 2011 60 010302]
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[23] Liu Y X, Sun C P, Nori F 2006 Phys. Rev. A 74 052321
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[1] Pashkin Y A, Yamamoto T, Astafiev O, Nakamura Y, Averin D V,Tsai J S 2003 Nature 421 823
[2] Makhlin Y, Schön G, Shnirman A 1999 Nature 398 305
[3] Shor W, Vandersypen L M K, Steffen M 2001 Nature 414 883
[4] Duan L M, Kuzmich A, Kimble H J 2003 Phys. Rev. A 67 032305
[5] Gulde S, Riebe M, Lancaster G P T, Becher C, Eschner J, HäffnerH, Schmidt-Kaler F, Chuang I L, Blatt R 2003 Nature 421 48
[6] Ciric J I, Zoller P 1995 Phys. Rev. Lett. 74 4091
[7] Turchette Q A, Hood C J, Lange W, Mabuchi H, Kimble H J 1995Phys. Rev. Lett. 75 4710
[8] Josephson B D 1962 Phys. Lett. 1 251
[9] Vourdas A 1994 Phys. Rev. B 49 12040
[10] Vourdas A 1996 J. Mod. Opt. 43 2105
[11] Nakamura Y, Pashkin Y A, Tsai J S 1999 Nature 398 786
[12] Ioffe L B, Geshkenbein V B, Feigelman M V, Fauchére A L, BlatterG 1999 Nature 398 679
[13] Mun D K, Sam Y C 2007 Phys. Rev. B 75 134514
[14] Zagoskin A M, Ashhab S, Johansson J R, Nori F 2006 Phys. Rev.Lett. 97 077001
[15] Bouchiat V 1999 J. Superconduct. 12 789
[16] Shirman A, Schön G, Hermon Z 1997 Phys. Rev. Lett. 79 2371
[17] You J Q, Lam C H, Zheng H Z 2001 Phys. Rev. B 63 180501
[18] Wu S H, Hu M L, Li J, Hui X Q 2011 Acta Phys. Sin. 60 010302(in Chinese) [吴世海, 胡明亮, 李季, 惠小强 2011 60 010302]
[19] Liang B L, Wang J S, Fan H Y, Meng X G 2008 Chin. Phys. Lett.25 3753
[20] Liang B L, Wang J S, Meng X G, Su J 2010 Chin. Phys. B 19010315
[21] Wu C, Fang M F, Xiao X, Li Y L, Cao S 2011 Chin. Phys. B 20020305
[22] Li Z X, Zou J, Cai J F, Shao B 2006 Acta Phys. Sin. 55 1580 (inChinese) [李照鑫, 邹 健, 蔡金芳, 邵彬 2006 55 1580]
[23] Liu Y X, Sun C P, Nori F 2006 Phys. Rev. A 74 052321
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