Manipulating the Quantum State of an Electrical Circuit

Details Manipulating the Quantum State of an Electrical Circuit Manipulating the Quantum State of an Electrical Circuit

2002-05-16

arxiv.org/abs/cond-mat/0205343v2

Science 296, 886-889 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 figures included

Scientific paper

10.1126/science.1069372

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 sub-circuit. The measured quality factor of quantum coherence Qphi=25000 is sufficiently high that a solid-state quantum processor based on this type of circuit can be envisioned.

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