Flux Qubit in Charge-Phase Regime

Details Flux Qubit in Charge-Phase Regime Flux Qubit in Charge-Phase Regime

2003-11-10

arxiv.org/abs/cond-mat/0311220v3

Phys. Rev. B 71, 024504 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 5 figures, final version to appear in PRB

Scientific paper

10.1103/PhysRevB.71.024504

A superconducting qubit implementation is proposed that takes the advantage of both charge and phase degrees of freedom. Superpositions of flux states in a superconducting loop with three Josephson junctions form the states of the qubit. The charge degree of freedom is used to readout and couple the qubits. Cancellation of first order coupling to charge and flux fluctuations, at the working point of the qubit, protects it from the dephasing due to these sources.

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