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Phys. Rev. A 69, 052309 (2004) [6 pages]

Decoherence of two Josephson charge qubits coupled via σxσx -type coupling and exposed to σx noise

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Ahmad Abliz1,2, Shu-Shen Li1, Lian-Liang Sun1, Song-Lin Feng1, and Hou-Zhi Zheng1
1State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, P. O. Box 912, Beijing 100083, People’s Republic of China
2School of Mathematics, Physics and Information Sciences, Xinjiang Normal University, Urumchi 830054, People’s Republic of China

Received 30 September 2003; published 12 May 2004

Decoherence properties of two Josephson charge qubits coupled via the σxσx type are investigated. Considering the special structure of this new design, the dissipative effects arising from the circuit impedance providing the fluxes for the qubits’ superconducting quantum interference device loops coupled to the σx qubit variables are considered. The results show that the overall decoherence effects are significantly strong in this qubit design. It is found that the dissipative effects are stronger in the case of coupling to two uncorrelated baths than are found in the case of one common bath.


©2004 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevA.69.052309
DOI: 10.1103/PhysRevA.69.052309
PACS: 03.67.Lx, 03.65.Yz, 05.40.−a

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