Decoherence dynamics of a charge qubit coupled to the noise bath

doi:10.1088/1674-1056/22/7/070301

中国物理B ›› 2013, Vol. 22 ›› Issue (7): 70301-070301.doi: 10.1088/1674-1056/22/7/070301

Decoherence dynamics of a charge qubit coupled to the noise bath

杨芹英^a, 梁宝龙^a, 王继锁^{a b}

a School of Physics Science and Information Engineering, Liaocheng University, Liaocheng 252059, China;
b College of Physics and Engineering, Qufu Normal University, Qufu 273165, China

收稿日期:2012-11-29 修回日期:2013-02-13 出版日期:2013-06-01 发布日期:2013-06-01
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11147009 and 11244005) and the Natural Science Foundation of Shandong Province, China (Grant Nos. ZR2010AQ027 and ZR2012AM004).

Decoherence dynamics of a charge qubit coupled to the noise bath

Yang Qin-Ying (杨芹英)^a, Liang Bao-Long (梁宝龙)^a, Wang Ji-Suo (王继锁)^{a b}

a School of Physics Science and Information Engineering, Liaocheng University, Liaocheng 252059, China;
b College of Physics and Engineering, Qufu Normal University, Qufu 273165, China

Received:2012-11-29 Revised:2013-02-13 Online:2013-06-01 Published:2013-06-01
Contact: Wang Ji-Suo E-mail:jswang@lcu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11147009 and 11244005) and the Natural Science Foundation of Shandong Province, China (Grant Nos. ZR2010AQ027 and ZR2012AM004).

摘要/Abstract

摘要： By virtue of the canonical quantization method, we present a quantization scheme about a charge qubit based on the superconducting quantum interference device (SQUID), taking the self-inductance of the loop into account. Under the reasonable short-time approximation, we study the effect of decoherence in the Ohmic case by employing the response function and the norm. It is confirmed that the decoherence time which depends on the parameters of circuit components, coupling strength, and temperature, can be as low as several picoseconds, so that there is enough time to record information.

关键词: charge qubit, decoherence, response function, norm

Abstract: By virtue of the canonical quantization method, we present a quantization scheme about a charge qubit based on the superconducting quantum interference device (SQUID), taking the self-inductance of the loop into account. Under the reasonable short-time approximation, we study the effect of decoherence in the Ohmic case by employing the response function and the norm. It is confirmed that the decoherence time which depends on the parameters of circuit components, coupling strength, and temperature, can be as low as several picoseconds, so that there is enough time to record information.

Key words: charge qubit, decoherence, response function, norm

中图分类号: (Decoherence; open systems; quantum statistical methods)

03.65.Yz

68.65.-k (Low-dimensional, mesoscopic, nanoscale and other related systems: structure and nonelectronic properties) 03.65.-w (Quantum mechanics)

杨芹英, 梁宝龙, 王继锁. Decoherence dynamics of a charge qubit coupled to the noise bath[J]. 中国物理B, 2013, 22(7): 70301-070301.

Yang Qin-Ying (杨芹英), Liang Bao-Long (梁宝龙), Wang Ji-Suo (王继锁). Decoherence dynamics of a charge qubit coupled to the noise bath[J]. Chin. Phys. B, 2013, 22(7): 70301-070301.

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Decoherence dynamics of a charge qubit coupled to the noise bath

Decoherence dynamics of a charge qubit coupled to the noise bath

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