Controlled decoherence of floating flux qubits

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

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.

Keywords: decoherence time floating flux qubit control

Received: 02 April 2010
Revised: 07 May 2010
Accepted manuscript online:

PACS:	03.65.Yz	(Decoherence; open systems; quantum statistical methods)
	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)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10864002).

Cite this article:

Ji Ying-Hua(嵇英华) and Xu Lin(徐林) Controlled decoherence of floating flux qubits 2010 Chin. Phys. B 19 110305

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Controlled decoherence of floating flux qubits

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