Coupling superconducting qubits via a cavity bus

J. Majer (), J. M. Chow, J. M. Gambetta, Jens Koch, B. R. Johnson, J. A. Schreier, L. Frunzio, D. I. Schuster, A. A. Houck, A. Wallraff, A. Blais, M. H. Devoret, S. M. Girvin and R. J. Schoelkopf ()
Additional contact information
J. Majer: Yale University, New Haven, Connecticut 06520, USA
J. M. Chow: Yale University, New Haven, Connecticut 06520, USA
J. M. Gambetta: Yale University, New Haven, Connecticut 06520, USA
Jens Koch: Yale University, New Haven, Connecticut 06520, USA
B. R. Johnson: Yale University, New Haven, Connecticut 06520, USA
J. A. Schreier: Yale University, New Haven, Connecticut 06520, USA
L. Frunzio: Yale University, New Haven, Connecticut 06520, USA
D. I. Schuster: Yale University, New Haven, Connecticut 06520, USA
A. A. Houck: Yale University, New Haven, Connecticut 06520, USA
A. Wallraff: Yale University, New Haven, Connecticut 06520, USA
A. Blais: Yale University, New Haven, Connecticut 06520, USA
M. H. Devoret: Yale University, New Haven, Connecticut 06520, USA
S. M. Girvin: Yale University, New Haven, Connecticut 06520, USA
R. J. Schoelkopf: Yale University, New Haven, Connecticut 06520, USA

Nature, 2007, vol. 449, issue 7161, 443-447

Abstract: Catching the quantum bus Microfabricated superconducting circuit elements can harness the power of quantum behaviour for information processing. Unlike classical information bits, quantum information bits (qubits) can form superpositions or mixture states of ON and OFF, offering a faster, natural form of parallel processing. Previously, direct qubit–qubit coupling has been achieved for up to four qubits, but now two independent groups demonstrate the next crucial step: communication and exchange of quantum information between two superconducting qubits via a quantum bus, in the form of a resonant cavity formed by a superconducting transmission line a few millimetres long. Using this microwave cavity it is possible to store, transfer and exchange quantum information between two quantum bits. It can also perform multiplexed qubit readout. This basic architecture lends itself to expansion, offering the possibility for the coherent interaction of many superconducting qubits. The cover illustrates a zig-zag-shaped resonant cavity or quantum bus linking two superconducting phase qubits.

Date: 2007
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DOI: 10.1038/nature06184

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