Macroscopic tunnel splittings in superconducting phase qubits

Details Macroscopic tunnel splittings in superconducting phase qubits Macroscopic tunnel splittings in superconducting phase qubits

2004-11-24

arxiv.org/abs/quant-ph/0411181v3

Phys. Rev. Lett. 94, 187004 (2005)

Physics

Quantum Physics

4 pages (3 figures); accepted version

Scientific paper

10.1103/PhysRevLett.94.187004

Prototype Josephson-junction based qubit coherence times are too short for quantum computing. Recent experiments probing superconducting phase qubits have revealed previously unseen fine splittings in the transition energy spectra. These splittings have been attributed to new microscopic degrees of freedom (microresonators), a previously unknown source of decoherence. We show that macroscopic resonant tunneling in the extremely asymmetric double well potential of the phase qubit can have observational consequences that are strikingly similar to the observed data.

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