Josephson charge-phase qubit with radio frequency readout: coupling and decoherence

Details Josephson charge-phase qubit with radio frequency readout: coupling and decoherence Josephson charge-phase qubit with radio frequency readout: coupling and decoherence

2003-12-09

arxiv.org/abs/cond-mat/0312225v1

Journal of Experimental and Theoretical Physics, Vol.98, No.6, 1250-1261 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

11 pages incl. 6 figs

Scientific paper

10.1134/1.1777638

The charge-phase Josephson qubit based on a superconducting single charge transistor inserted in a low-inductance superconducting loop is considered. The loop is inductively coupled to a radio-frequency driven tank circuit enabling the readout of the qubit states by measuring the effective Josephson inductance of the transistor. The effect of qubit dephasing and relaxation due to electric and magnetic control lines as well as the measuring system is evaluated. Recommendations for operation of the qubit in magic points producing minimum decoherence are given.

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