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Science 3 May 2002:
Vol. 296. no. 5569, pp. 886 - 889
DOI: 10.1126/science.1069372
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Reports

Manipulating the Quantum State of an Electrical Circuit

D. Vion,* A. Aassime, A. Cottet, P. Joyez, H. Pothier, C. Urbina,dagger D. Esteve, M. H. Devoretddagger

We have designed and operated a superconducting tunnel junction circuit that behaves as a two-level atom: the "quantronium." An arbitrary evolution of its quantum state can be programmed with a series of microwave pulses, and a projective measurement of the state can be performed by a pulsed readout subcircuit. The measured quality factor of quantum coherence Qphiv congruent  25,000 is sufficiently high that a solid-state quantum processor based on this type of circuit can be envisioned.

Quantronics Group, Service de Physique de l'Etat Condensé, Direction des Sciences de la Matière, Commissariat à l'Energie Atomique-Saclay, 91191 Gif-sur-Yvette, France.
*   To whom correspondence should be addressed. E-mail: vion{at}drecam.saclay.cea.fr

dagger    Member of CNRS.

ddagger    Present address: Applied Physics Department, Yale University, New Haven, CT 06520, USA.

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