Decoherence dynamics of a charge qubit coupled to the noise bath

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

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.

Keywords: charge qubit decoherence response function norm

Received: 29 November 2012
Revised: 13 February 2013
Accepted manuscript online:

PACS:	03.65.Yz	(Decoherence; open systems; quantum statistical methods)
	68.65.-k	(Low-dimensional, mesoscopic, nanoscale and other related systems: structure and nonelectronic properties)
	03.65.-w	(Quantum mechanics)

Fund: 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).

Corresponding Authors: Wang Ji-Suo
E-mail: jswang@lcu.edu.cn

Cite this article:

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 2013 Chin. Phys. B 22 070301

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