Controlled decoherence of floating flux qubits

doi:10.1088/1674-1056/19/11/110305

中国物理B ›› 2010, Vol. 19 ›› Issue (11): 110305-110310.doi: 10.1088/1674-1056/19/11/110305

Controlled decoherence of floating flux qubits

徐林¹, 嵇英华²

(1)College of Physics and Communication Electronics, Jiangxi Normal University, Nanchang 330022, China; (2)College of Physics and Communication Electronics, Jiangxi Normal University, Nanchang 330022, China; Key Laboratory of Optoelectronic and Telecommunication of Jiangxi, Nanchang 330022, China

收稿日期:2010-04-02 修回日期:2010-05-07 出版日期:2010-11-15 发布日期:2010-11-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 10864002).

Controlled decoherence of floating flux qubits

Ji Ying-Hua(嵇英华)^a)b)^† and Xu Lin(徐林)^a)

^a College of Physics and Communication Electronics, Jiangxi Normal University, Nanchang 330022, China; ^b Key Laboratory of Optoelectronic and Telecommunication of Jiangxi, Nanchang 330022, China

Received:2010-04-02 Revised:2010-05-07 Online:2010-11-15 Published:2010-11-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 10864002).

摘要/Abstract

摘要： In Born--Markov approximation, this paper calculates the energy relaxation time T₁ and the decoherence time T₂ of a floating flux qubit by solving the set of Bloch--Redfield equations. It shows that there are two main factors influencing the floating flux qubits: coupling capacitor in the circuit and the environment resistor. It also discusses how to improve the quantum coherence time of a qubit. Through shunt connecting/ series connecting inductive elements, an inductive environment resistor is obtained and further the reactance component of the environment resistor is improved，which is beneficial to the enhancement of decoherence time of floating flux qubits.

Abstract: In Born–Markov approximation, this paper calculates the energy relaxation time T₁ and the decoherence time T₂ of a floating flux qubit by solving the set of Bloch–Redfield equations. It shows that there are two main factors influencing the floating flux qubits: coupling capacitor in the circuit and the environment resistor. It also discusses how to improve the quantum coherence time of a qubit. Through shunt connecting/ series connecting inductive elements, an inductive environment resistor is obtained and further the reactance component of the environment resistor is improved，which is beneficial to the enhancement of decoherence time of floating flux qubits.

Key words: decoherence time, floating flux qubit, control

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

03.65.Yz

03.67.Lx (Quantum computation architectures and implementations) 84.30.Bv (Circuit theory) 84.32.Ff (Conductors, resistors (including thermistors, varistors, and photoresistors)) 84.32.Tt (Capacitors)

嵇英华, 徐林. Controlled decoherence of floating flux qubits[J]. 中国物理B, 2010, 19(11): 110305-110310.

Ji Ying-Hua(嵇英华) and Xu Lin(徐林). Controlled decoherence of floating flux qubits[J]. Chin. Phys. B, 2010, 19(11): 110305-110310.

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Controlled decoherence of floating flux qubits

Controlled decoherence of floating flux qubits

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