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Article Dans Une Revue Physical Review Letters Année : 2009

Quantum dynamics in a camel-back potential of a dc SQUID

Résumé

We investigate a quadratic-quartic anharmonic oscillator formed by a potential well between two potential barriers. We realize this novel potential shape with a superconducting circuit comprised of a loop interrupted by two Josephson junctions (dc SQUID), with near-zero current bias and flux bias near half a flux quantum. We investigate escape out of the central well, which can occur via tunneling through either of the two barriers, and find good agreement with a generalized double-path macroscopic quantum tunneling theory. We also demonstrate that this system exhibits an ''optimal line'' in current and flux bias space along which the oscillator, which can be operated as a phase qubit, is insensitive to decoherence due to low-frequency current fluctuations.
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Dates et versions

hal-00352538 , version 1 (13-01-2009)

Identifiants

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Emile Hoskinson, Florent Lecocq, Nicolas Didier, Aurélien Fay, Frank. W. J. Hekking, et al.. Quantum dynamics in a camel-back potential of a dc SQUID. Physical Review Letters, 2009, 102, pp.097004. ⟨10.1103/PhysRevLett.102.097004⟩. ⟨hal-00352538⟩
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