Quantum oscillations in two coupled charge qubits

Yu. A. Pashkin, T. Yamamoto, O. Astafiev, Y. Nakamura, D. V. Averin and J. S. Tsai ()
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Yu. A. Pashkin: The Institute of Physical and Chemical Research (RIKEN)
T. Yamamoto: The Institute of Physical and Chemical Research (RIKEN)
O. Astafiev: The Institute of Physical and Chemical Research (RIKEN)
Y. Nakamura: The Institute of Physical and Chemical Research (RIKEN)
D. V. Averin: SUNY Stony Brook
J. S. Tsai: The Institute of Physical and Chemical Research (RIKEN)

Nature, 2003, vol. 421, issue 6925, 823-826

Abstract: Abstract A practical quantum computer1, if built, would consist of a set of coupled two-level quantum systems (qubits). Among the variety of qubits implemented2, solid-state qubits are of particular interest because of their potential suitability for integrated devices. A variety of qubits based on Josephson junctions3,4 have been implemented5,6,7,8; these exploit the coherence of Cooper-pair tunnelling in the superconducting state5,6,7,8,9,10. Despite apparent progress in the implementation of individual solid-state qubits, there have been no experimental reports of multiple qubit gates—a basic requirement for building a real quantum computer. Here we demonstrate a Josephson circuit consisting of two coupled charge qubits. Using a pulse technique, we coherently mix quantum states and observe quantum oscillations, the spectrum of which reflects interaction between the qubits. Our results demonstrate the feasibility of coupling multiple solid-state qubits, and indicate the existence of entangled two-qubit states.

Date: 2003
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DOI: 10.1038/nature01365

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