Tunable coupling of superconducting qubits

Details Tunable coupling of superconducting qubits Tunable coupling of superconducting qubits

2002-07-03

arxiv.org/abs/cond-mat/0207112v3

Phys. Rev. Lett._90_, 127901 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

To appear in Phys. Rev. Lett., 3 figures

Scientific paper

10.1103/PhysRevLett.90.127901

We study an LC-circuit implemented using a current-biased Josephson junction (CBJJ) as a tunable coupler for superconducting qubits. By modulating the bias current, the junction can be tuned in and out of resonance and entangled with the qubits coupled to it. One can thus implement two-qubit operations by mediating entanglement. We consider the examples of CBJJ and charge--phase qubits. A simple recoupling scheme leads to a generalization to arbitrary qubit designs.

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