Coherent Quantum Dynamics of a Superconducting Flux Qubit

Details Coherent Quantum Dynamics of a Superconducting Flux Qubit Coherent Quantum Dynamics of a Superconducting Flux Qubit

2003-05-20

arxiv.org/abs/cond-mat/0305461v1

Science, vol. 299, p. 1869 (2003) ; on-line at http://www.sciencemag.org/cgi/content/abstract/299/5614/1869

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

submitted 2 December 2002; accepted 4 February 2003

Scientific paper

10.1126/science.1081045

We have observed coherent time evolution between two quantum states of a superconducting flux qubit comprising three Josephson junctions in a loop. The superposition of the two states carrying opposite macroscopic persistent currents is manipulated by resonant microwave pulses. Readout by means of switching-event measurement with an attached superconducting quantum interference device revealed quantum-state oscillations with high fidelity. Under strong microwave driving it was possible to induce hundreds of coherent oscillations. Pulsed operations on this first sample yielded a relaxation time of 900 nanoseconds and a free-induction dephasing time of 20 nanoseconds. These results are promising for future solid-state quantum computing.

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