运用热力学统计中Kramers理论和Wentzel-Kramers-Brillouin (WKB)近似理论,分析了三结磁通量子比特中处于亚稳态粒子的热逃逸和量子隧穿逃逸.在0.01～4.2 K温度下,计算出了粒子的逃逸率,得到了跳变磁通随磁场和温度变化的分布规律,并同两结超导干涉仪的分布规律进行了定量比较.结果显示,三结磁通量子比特自身噪声比两结超导干涉仪大.
参考文献
| [1] | Zhou Zhengwei,Tu Tao,Gong Ming,et al.Advances and prospects in research on quantun computation[J].Progress in Physics(物理学进展), 2009,29(3):0127-0165 (in Chinese). |
| [2] | Liang Baolong,Wang Jisuo,Meng Xiaoguo,et al.Quantization of mesoscopic mutual inductance coupling circuit with superconducting Josephson junctions and their quantum effects[J].Chinese Journal of Quantum Electronics(量子电子学报),2007,24(5):561-568(in Chinese). |
| [3] | Zhou Tengfei,Chen Zhiquan,et al.Mutual inductance's influence on the decoherence of flux qubit[J].Chinese Journal of Quantum Electronics(量子电子学报),2008,25(6):703-711(in Chinese). |
| [4] | Makhlin A J,Chakravarty S,Dorsey A T.Quantum-state engineering with Josephson-junction devices[J].Rev.Mod.Phys.,2001,73(2):357-400. |
| [5] | Wang Zhen,Li Shaoxiong,Yu Yang,et al.Quantitative study of macroscopic quantum tunneling in a dc-SQUID:a system with two degrees of freedom[J].Phys.Rev.Lett.,2002 89(9):098301. |
| [6] | Sun Guozhu,Dong Ning,Mao Guangfeng,et al.Thermal escape from a metastable state in periodically driven Josephson junction[J].Phys.Rev.E,2007,75(2):021107. |
| [7] | Han Siyuan,Yu H F,Zhu X B,et al.Quantum and classical resonant escape of a strongly driven Josephson junction[J].Phys.Rev.B,2010,81(14):1445181-1445189. |
| [8] | Mooij J E,Orlando T P,Levitov L.Josephson persistent current qubit[J].Science,1999,285:1036-1039. |
| [9] | Orlando T P,Mooij J E,Tian Lin,et al.Superconducting persistent current qubit[J].Phys.Rev.B,1999,60(22):15398-15413. |
| [10] | Mao Guangfeng,Yu Yang.Superconducting quantum bits based on Josephson devices[J].Progress in Physics (物理学进展),2007,26(1):0034-0042 (in Chinese). |
| [11] | Liu Yuxi,You J Q,Wei L F,et al.Optical selection rules and phase dependent adiabatic stata control in superconducting quantun circuit[J].Phys.Rev.Lett.,2005,95(8):087001. |
| [12] | Tesche C D.A thermal activation model for noise in the dc SQUID[J].J.Low.Temp.Phys.,1981,44:119-147. |
| [13] | Jacob E B,Bergman D J,Imry Y.Thermal activation from the fluxoid and voltage states of dc SQUID[J].J.Appl.Phys.,1983,54(11):6533-6542. |
| [14] | Martinis J M,Devoret M H,Clarke J.Experimental tests for the quantum behavior of a macroscopic degree of freedom the phase difference across a Josephson junction[J].Phys.Rev.B,1987,35(10):4682-4698. |
| [15] | Cui Dajian,Lin Dehua,Yu Haifeng,et al.Quantum corrections in fitting the switching current distributions of intrinsic Josephson junction[J].Acta Physica Sinica(物理学报),2008,57(09):5933-5936 (in Chinese). |
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