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Phys. Rev. Lett. 90, 127901 (2003) [4 pages]

Tunable Coupling of Superconducting Qubits

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Alexandre Blais1,*, Alexander Maassen van den Brink2,†, and Alexandre M. Zagoskin2,3,‡
1Département de Physique and Centre de Recherche sur les Propriétés Électroniques de Matériaux Avancés, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1
2D-Wave Systems Inc., 320-1985 West Broadway, Vancouver, British Columbia, Canada V6J 4Y3
3Physics and Astronomy Department, The University of British Columbia, 6224 Agricultural Road, Vancouver, British Columbia, Canada V6T 1Z1

Received 13 July 2002; published 24 March 2003

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.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.127901
DOI:
10.1103/PhysRevLett.90.127901
PACS:
03.67.Lx, 73.23.Hk, 74.50.+r

*Electronic address: alexandre.blais@yale.edu

Present address: Department of Physics, Yale University, P.O. Box 208120, New Haven, CT 06520-8120.

†Electronic address: alec@dwavesys.com

‡Electronic address: zagoskin@dwavesys.com

 
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