Flux qubit with a large loop size and tunable Josephson junctions

doi:10.1088/1674-1056/21/4/040307

Abstract We present the design of a superconducting flux qubit with a large loop inductance. The large loop inductance is desirable for coupling between qubits. The loop is configured into a gradiometer form that could reduce the interference from environmental magnetic noise. A combined Josephson junction, i.e., a DC-SQUID is used to replace the small Josephson junction in the usual 3-JJ (Josephaon junction) flux qubit, leading to a tunable energy gap by using an independent external flux line. We perform numerical calculations to investigate the dependence of the energy gap on qubit parameters such as junction capacitance, critical current, loop inductance, and the ratio of junction energy between small and large junctions in the flux qubit. We suggest a range of values for the parameters.

Keywords: flux qubit four Josephson junctions tunable energy gap

Received: 16 December 2011
Revised: 29 December 2011
Accepted manuscript online:

PACS:	03.67.Lx	(Quantum computation architectures and implementations)
	85.25.Cp	(Josephson devices)
	85.25.Dq	(Superconducting quantum interference devices (SQUIDs))

Fund: Project supported by the National Basic Research Program of China(Grant Nos.2011CBA00106 and 2009CB929102)and the National Natural Science Foundation of China(Grant Nos.11104340,11161130519,and 10974243)

Corresponding Authors: Zheng Dong-Ning, E-mail:dzheng@aphy.iphy.ac.cn
E-mail: dzheng@aphy.iphy.ac.cn

Cite this article:

Deng Hui(邓辉), Yu Hai-Feng(于海峰), Xue Guang-Ming(薛光明), Tian Ye(田野), Ren Jian-Kun(任建坤), Wu Yu-Lin(吴玉林), Huang Ke-Qiang(黄克强), Zhao Shi-Ping(赵士平), and Zheng Dong-Ning(郑东宁) Flux qubit with a large loop size and tunable Josephson junctions 2012 Chin. Phys. B 21 040307

[1]	You J Q and Nori F 2005 Phys. Today 58 42
[2]	Li Z X, Zou J, Cai J F and Shao B 2006 Acta Phys. Sin. 55 1580 (in Chinese)
[3]	Cao W H, Yu H F, Tian Y, Yu H W, Ren Y F, Chen G H and Zhao S P 2009 Chin. Phys. B 18 5044
[4]	Wu S H, Hu M L, Li J and Xi X Q 2011 Acta Phys. Sin. 60 010302 (in Chinese)
[5]	Liang B L, Wang J S, Meng X G and Su J 2010 Chin. Phys. B 19 010315
[6]	Ji Y H, Lai H F, Cai S H and Wang Z S 2010 Chin. Phys. B 19 030310
[7]	Jiang W, Yu Y and Wei L F 2011 Chin. Phys. B 20 080307
[8]	Cong S H, Wang Y W, Sun G Z, Chen J, Yu Y and Wu P H 2011 Chin. Phys. B 20 050316
[9]	Bylander J, Gustavsson S, Yan F, Yoshihara F, Harrabi K, Fitch G, Cory D G, Nakamura Y, Tsai J S and Oliver W D 2011 Nature Phys. 7 565
[10]	Mooij J E, Orlando T P, Levitov L, Tian L, van der Wal C H and Lloyd S 1999 Science 285 1036
[11]	Orlando T P, Mooij J E, Tian L, van der Wal C H, Levitov L S, Lloyd S and Mazo J J 1999 Phys. Rev. B 60 15398
[12]	Paauw F G, Fedorov A, Harmans C J P M and Mooij J E 2009 Phys. Rev. Lett. 102 090501
[13]	Lanting T, Berkley A J, Bumble B, Bunyk P, Fung A, Johansson J, Kaul A, Kleinsasser A, Ladizinsky E, Maibaum F, Harris R, Johnson M W, Tolkacheva E and Amin M H S 2009 Phys. Rev. B 79 060509(R)
[14]	Harris R, Johnson M W, Han S, Berkley A J, Johansson J, Bunyk P, Ladizinsky E, Govorkov S, Thom M C, Uchaikin S, Bumble B, Fung A, Kaul A, Kleinsasser A, Amin M H S and Averin D V 2008 Phys. Rev. Lett. 101 117003
[15]	Kroger H, Smith L N and Jillie D W 1981 Appl. Phys. Lett. 39 280
[16]	Zhu X B, Kemp A, Saito S and Semba K 2010 Appl. Phys. Lett. 97 102503
[17]	Robertson T L, Plourde B L T, Reichardt P A, Hime T, Wu C E and Clarke J 2006 Phys. Rev. B 73 174526
[18]	Kamon M, Tsuk M J and White J K 1994 IEEE T Microw Theory 42 1750

[1]	Creating nitrogen–vacancy ensembles in diamond for coupling with flux qubit Ya-Rui Zheng(郑亚锐), Jian Xing(邢健), Yan-Chun Chang(常彦春), Zhi-Guang Yan(闫智广), Hui Deng(邓辉), Yu-Lin Wu(吴玉林), Li Lü(吕力), Xin-Yu Pan(潘新宇), Xiao-Bo Zhu(朱晓波), Dong-Ning Zheng(郑东宁). Chin. Phys. B, 2017, 26(2): 020305.
[2]	Design of a gap tunable flux qubit with FastHenry Naheed Akhtar, Yarui Zheng(郑亚锐), Mudassar Nazir, Yulin Wu(吴玉林), Hui Deng(邓辉), Dongning Zheng(郑东宁), Xiaobo Zhu(朱晓波). Chin. Phys. B, 2016, 25(12): 120305.
[3]	Spectroscopy and coherent manipulation of single and coupled flux qubits Wu Yu-Lin (吴玉林), Deng Hui (邓辉), Huang Ke-Qiang (黄克强), Tian Ye (田野), Yu Hai-Feng (于海峰), Xue Guang-Ming (薛光明), Jin Yi-Rong (金贻荣), Li Jie (李洁), Zhao Shi-Ping (赵士平), Zheng Dong-Ning (郑东宁). Chin. Phys. B, 2013, 22(9): 090312.
[4]	Tuning rf-SQUID flux qubit system's potential with magnetic flux bias Hua Tao (花涛), Xu Wei-Wei (许伟伟), Shi Jian-Xin (史建新), An De-Yue (安德越), Sun Guo-Zhu (孙国柱), Yu Yang (于扬), Wu Pei-Heng (吴培亨). Chin. Phys. B, 2012, 21(9): 098501.
[5]	Aharonov–Anandan phase gate in sub Hilbert space of a coupling flux qubits system Zheng Guo-Lin(郑国林), Deng Hui(邓辉), Wu Yu-Lin(吴玉林), Wang Xin-Qiang(王新强), Chen Ying-Fei(陈莺飞), and Zheng Dong-Ning(郑东宁) . Chin. Phys. B, 2012, 21(7): 070310.
[6]	Macroscopic resonant tunneling in an rf-SQUID flux qubit Cong Shan-Hua (丛山桦), Wang Yi-Wen (王轶文), Sun Guo-Zhu (孙国柱), Chen Jian (陈健), Yu Yang (于扬), Wu Pei-Heng (吴培亨). Chin. Phys. B, 2011, 20(5): 050316.
[7]	The initial decoherence of the mesoscopic Josephson junction flux qubit Su Jie(苏杰), Wang Ji-Suo(王继锁), Zhang Xiao-Yan(张晓燕), and Liang Bao-Long(梁宝龙). Chin. Phys. B, 2010, 19(5): 057301.
[8]	Controlled decoherence of floating flux qubits Ji Ying-Hua(嵇英华) and Xu Lin(徐林). Chin. Phys. B, 2010, 19(11): 110305.

No Suggested Reading articles found!

Viewed

Full text

Abstract

Cited

Metrics
Related Articles

Flux qubit with a large loop size and tunable Josephson junctions

Cite this article:

Online attention