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在二能级近似下运用Bloch-Redfield方程,研究了超导量子电路中的磁通量子比特退相干在超欧姆热库环境下受互感效应的影响.研究结果表明:1)在超欧姆热库环境下,提高环境指标系数有利于延长超导磁通量子比特的退相干时间; 2)构建超欧姆型热库环境可以改进固态量子比特的退相干; 3)电感元件间的互感耦合对量子电路系统退相干的影响是比较复杂的,调控好电感元件间的互感耦合有利于提高退相干时间.

参考文献

[1] Etaki S,Poot M,et al.Motion detection of a micromechanical resonator embedded in a d.c.SQUID[J].Nature Phys.,2008,4:785-788.
[2] Ding Zhiyong,He Juan,Wu Tao.One step for generation of W-class states via superconducting quantum interference devices[J].Chinese Journal of Quantum Electronics(量子电子学报),2010,27(3):314-318 (in Chinese).
[3] He Daiguo,Dong Yuli,Fang Jianxing,et al.Entangled coherent states:generation[J].Chinese Journal of Quantum Electronics(量子电子学报),2011,28(4):407-413 (in Chinese).
[4] Johansson J R,Johansson G,et al.Dynamical casimir effect in a superconducting coplanar waveguide[J].Phys.Rev.Lett.,2009,103(14):147003.
[5] Wilson C M,Johansson G,et al.Dressed relaxation and dephasing in a strongly driven two-level system[J].Phys.Rev.B,2010,81:024520.
[6] Ji Y H,Lai H F,Cai S H,et al.Controlled decoherence of three-level floating qubit[J].Chin.Phys.B,2010,19:030310.
[7] Dicarlo L,Chow J M,Gambetta J M,et al.Demonstration of two-qubit algorithms with a superconducting quantum processor[J].Nature,2009,460:240.
[8] Cai Shaohong,Kang Jinping,Zhang Yuqiang.Quantum effects in inductance coupled mesoscopic circuit at excited coherent stats[J].Chinese Journal of Quantum Electronics(量子电子学报),2011,28(5):605-611(in Chinese).
[9] Zhang J,Peng X,Rajendran N,et al.Detection of quantum critical points by a probe qubit[J].Phys.Rev.Lett.,2008,100:100501.
[10] Ji Yinghua,Xu Lin.Entanglement decoherence of coupled superconductor qubits entangled states in nonMarkovian environment[J].Chinese Journal of Quantum Electronics(量子电子学报),2011,28(1):58-64(in Chinese).
[11] Zhang M,Jia H Y,Wei L F.Jaynes-Cummings models with trapped electrons on liquid helium[J].Phys.Rev.A,2009,80:055801.
[12] Sun G Z,Wei X D,Mao B,et al.Quantum dynamics of a microwave driven superconducting phase qubit coupled to a two-level system[J].Phys.Rev.B,2010,82:132501.
[13] Yu Y,Zhu S L,Sun G Z,et al.Quantum jumps between macroscopic quantum states of a superconducting qubit coupled to a microscopic two-level system[J].Phys.Rev.Lett.,2008,101:157001.
[14] Ji Y H,et al.Entanglement and decoherence of coupled superconductor qubits in a non-Markovian environment[J].Chin.Phys.B,2010,19:060304.
[15] Ji Y H,Liu Y M,Wang Z S.Avoiding the decay of entanglement for coupling two-qubit system interacting with a non-Markov environment[J].Chin.Phys.B,2011,20:070304.
[16] DiVincenzo D P,Brito F,Koch R H.Decoherence rates in complex Josephson qubit circuits[J].Phys.Rev.B,2006,74:014514.
[17] Burkard G.Circuit theory for decoherence in superconducting charge qubits[J].Phys.Rev.B,2005,71:144511.
[18] Burkard G,Koch R H,et al.Multilevel quantum description of decoherence in superconducting qubits[J].Phys.Rev.,2004,B69:064503.
[19] Ji Y H,et al.Investigation of decoherence of superconducting flux qubit entangled with the environment[J].Mod.Phy.Lett.B,2008,22(8):581.
[20] Egger R,Grabert H,Weiss U.Crossover from coherent to incoherent dynamics in damped quantum systems[J].Phys.Rev.E,1997,55:3809.
[21] Tong N H,Vojta M.Signatures of a noise-induced quantum phase transition in a mesoscopic metal ring[J].Phys.Rev.Lett.,2006,97(1):016802.
[22] Le Hur K,Doucet-Beaupre P,Hofstetter W.Entanglement and criticality in quantum impurity systems[J].Phys.Rev.Lett.,2007,99(12):126801.
[23] Pan C T,Cho D C,Wu G Y.Theoretical study of damping in coupled quantum dots[J].Journal of PhysicsCondensed Matter(凝聚态物理杂志),2006,18:1781 (in Chinese).
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