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

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

2008-10-14

arxiv.org/abs/0810.2372v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevLett.102.097004

We investigate the quantum dynamics of 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, 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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