用约瑟夫森电荷比特系统实现一种特殊量子态的传输

吴世海; 胡明亮; 李季; 惠小强

doi:10.7498/aps.60.010302

摘要

构造了一种约瑟夫森电荷量子比特电路系统,并研究了四量子位态在该系统中的传输特性.对均匀与非均匀传输通道两种情形分别讨论了怎样通过控制外加磁通来实现激发态 1〉从第一量子位到第四量子位的理想传输.此外还分析了量子态在该系统中传输时的平均保真度,结果表明该系统不能传输一个任意态.

关键词:

量子态传输 /
约瑟夫森电荷比特

A type of Josephson charge qubit circuit is constructed in this paper, and properties of four-qubit quantum state transfer through this system is also investigated. By modulating the external magnetic flux, we show that ideal transfer of an excited state 1〉 from the first qubit to the fourth qubit can be realized for both homogeneous and inhomogeneous transmission channels. Moreover, the average fidelity of state transfer across this system is also analyzed, the result revealed that it cannot be used to transfer an arbitrary quantum state.

Keywords:

quantum state transfer /
Josephson charge qubits

作者及机构信息

1.
西安邮电学院理学院,西安 710061

基金项目: 陕西省自然科学基金(批准号:2009JQ8006,2010JM1011)资助的课题.

Authors and contacts

1.
School of Science, Xi'an University of Posts and Telecommunications, Xi'an 710061, China

参考文献

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[26]	Pashkin Y A, Yamamoto T, Astafiev O, Nakamura Y, Averin D V, Tsai J S 2003 Nature 421 823
[27]	Fazio R, Massimo Palma G, Siewert J 1999 Phys. Rev. Lett. 83 5385
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[29]	You J Q, Tsai J S, Franco N 2002 Phys. Rev. Lett. 89 197902
[30]	Pashkin Y A, Astafiev O, Yamamoto T, Nakamura Y, Tsai J S 2009 Quantum Inf. Process. 8 55
[31]	Li D C, Zheng X H, Dong P, Cao Z L 2008 Commun. Theor. Phys. 49 1195
[32]	You J Q, Lam C H, Zheng H Z 2001 Phys. Rev. B 63 180501(R)
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[34]	Vion D, Aassime A, Cottet A, Joyez P, Pothier H, Urbina C, Esteve D, Devoret M H 2002 Science 296 886

施引文献

[1]	Marcikic I, de Riedmatten H, Tittel W, Zbinden H, Gisin N 2003 Nature 421 509
[2]	Yang X, Tong Z Y, Kuang L M 2008 Acta Phys. Sin. 57 1689 (in Chinese) [杨雄、童朝阳、匡乐满 2008 物理学报 57 1689]
[3]	Tian L, Rabl P, Blatt R, Zoller P 2004 Phys. Rev. Lett. 92 247902
[4]	Shi Z G, Chen X W, Zhu X X, Song K H 2009 Chin. Phys. B 18 0910
[5]	Bose S 2003 Phys. Rev. Lett. 91 207901
[6]	Christandl M, Datta N, Ekert A, Landahl A J 2004 Phys. Rev. Lett. 92 187902
[7]	Burgarth D, Bose S 2005 Phys. Rev. A 71 052315
[8]	Yan X B, Wang S J 2006 Acta Phys. Sin. 55 1591 (in Chinese) [严晓波、王顺金 2006 物理学报 55 1591]
[9]	Xi X Q, Gong J B, Zhang T, Yue R H, Liu W M 2008 Eur. Phys. J. D 50 193
[10]	Hu M L, Lian H L 2009 Eur. Phys. J. D 55 711
[11]	Hu M L, Xi X Q 2008 Acta Phys. Sin. 57 3319 (in Chinese) [胡明亮、惠小强 2008 物理学报 57 3319]
[12]	Yin J W, Xiao J L, Yu Y F, Wang Z W 2008 Acta Phys. Sin. 57 2695 (in Chinese) [尹辑文、肖景林、于毅夫、王子武 2008 物理学报 57 2695]
[13]	DiVincenzo D P 1995 Science 270 255
[14]	Nakamura Y, Pashkin Y A, Tsai J S 1999 Nature 398 786
[15]	Liang B L, Wang J S, Meng X G, Su J 2010 Chin. Phys. B 19 010315
[16]	Mooij J E, Orlando T P, Levitov L, Caspar H W, Lloyd S 1999 Science 285 1036
[17]	Orlando T P, Mooij J E, Tian L, Caspar H W, Levitov L S, Lloyd S, Mazo J J 1999 Phys. Rev. B 60 15398
[18]	Martinis J M, Nam S, Aumentado J, Urbina C 2002 Phys. Rev. Lett. 89 117901
[19]	Yu Y, Han S, Chu X, Chu S I, Wang Z 2002 Science 296 889
[20]	Romito A, Fazio R, Bruder C 2005 Phys. Rev. B 71 100501
[21]	Plastina F, Falci G 2003 Phys. Rev. B 67 224514
[22]	Lyakhov A, Bruder C 2005 New J. Phys. 7 181
[23]	Matters M, Elion W J, Mooij J E 1995 Phys. Rev. Lett. 75 721
[24]	Bouchiat V, Vion D, Joyez P, Esteve D, Devoret M H 1998 Phys. Scripta 76 165
[25]	Makhlin Y, Schn G, Shnirman A 1999 Nature 398 305
[26]	Pashkin Y A, Yamamoto T, Astafiev O, Nakamura Y, Averin D V, Tsai J S 2003 Nature 421 823
[27]	Fazio R, Massimo Palma G, Siewert J 1999 Phys. Rev. Lett. 83 5385
[28]	Nakamura Y, Pashkin Y A, Yamamoto T, Tsai J S 2002 Phys. Rev. Lett. 88 047901
[29]	You J Q, Tsai J S, Franco N 2002 Phys. Rev. Lett. 89 197902
[30]	Pashkin Y A, Astafiev O, Yamamoto T, Nakamura Y, Tsai J S 2009 Quantum Inf. Process. 8 55
[31]	Li D C, Zheng X H, Dong P, Cao Z L 2008 Commun. Theor. Phys. 49 1195
[32]	You J Q, Lam C H, Zheng H Z 2001 Phys. Rev. B 63 180501(R)
[33]	Makhlin Y, Sch n G, Shnirman A 2001 Rev. Mod. Phys. 73 357
[34]	Vion D, Aassime A, Cottet A, Joyez P, Pothier H, Urbina C, Esteve D, Devoret M H 2002 Science 296 886

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