Variable electrostatic transformer: controllable coupling of two charge qubits

Details Variable electrostatic transformer: controllable coupling of two charge qubits Variable electrostatic transformer: controllable coupling of two charge qubits

2003-04-07

arxiv.org/abs/cond-mat/0304166v2

Phys. Rev. Lett. 91, 057003 (2003).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

final version, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.91.057003

We propose and investigate a novel method for the controlled coupling of two Josephson charge qubits by means of a variable electrostatic transformer. The value of the coupling capacitance is given by the discretized curvature of the lowest energy band of a Josephson junction, which can be positive, negative, or zero. We calculate the charging diagram of the two-qubit system that reflects the transition from positive to negative through vanishing coupling. We also discuss how to construct a phase gate making use of the controllable coupling.

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