中国物理B ›› 2010, Vol. 19 ›› Issue (11): 110305-110310.doi: 10.1088/1674-1056/19/11/110305
徐林1, 嵇英华2
Ji Ying-Hua(嵇英华)a)b)† and Xu Lin(徐林)a)
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.
中图分类号: (Decoherence; open systems; quantum statistical methods)