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Science 4 May 2007:
Vol. 316. no. 5825, pp. 723 - 726
DOI: 10.1126/science.1141324
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Reports

Quantum Coherent Tunable Coupling of Superconducting Qubits

A. O. Niskanen,1,4 K. Harrabi,1 F. Yoshihara,2 Y. Nakamura,1,2,3* S. Lloyd,5 J. S. Tsai1,2,3

To do large-scale quantum information processing, it is necessary to control the interactions between individual qubits while retaining quantum coherence. To this end, superconducting circuits allow for a high degree of flexibility. We report on the time-domain tunable coupling of optimally biased superconducting flux qubits. By modulating the nonlinear inductance of an additional coupling element, we parametrically induced a two-qubit transition that was otherwise forbidden. We observed an on/off coupling ratio of 19 and were able to demonstrate a simple quantum protocol.

1 CREST, Japan Science and Technology Institute, Kawaguchi, Saitama 332-0012, Japan.
2 The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan.
3 NEC Fundamental and Environmental Research Laboratories, Tsukuba, Ibaraki 305-8501, Japan.
4 VTT Technical Research Centre of Finland, Sensors, Post Office Box 1000, 02044 VTT, Finland.
5 Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

* To whom correspondence should be addressed. E-mail: yasunobu{at}ce.jp.nec.com

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Observation of Berry's Phase in a Solid-State Qubit.
P. J. Leek, J. M. Fink, A. Blais, R. Bianchetti, M. Goppl, J. M. Gambetta, D. I. Schuster, L. Frunzio, R. J. Schoelkopf, and A. Wallraff (2007)
Science 318, 1889-1892
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Science. ISSN 0036-8075 (print), 1095-9203 (online)