Phys. Rev. Lett. 94, 187004 (2005) [4 pages]Macroscopic Tunnel Splittings in Superconducting Phase QubitsSee Also: Erratum Received 23 November 2004; published 13 May 2005 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. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.187004
DOI:
10.1103/PhysRevLett.94.187004
PACS:
74.50.+r, 03.65.Xp, 03.67.Lx, 85.25.Cp
See AlsoErratum: Philip R. Johnson, William T. Parsons, Frederick W. Strauch, J. R. Anderson, Alex J. Dragt, C. J. Lobb, and F. C. Wellstood, Erratum: Macroscopic Tunnel Splittings in Superconducting Phase Qubits [Phys. Rev. Lett. 94, 187004 (2005)], Phys. Rev. Lett. 95, 049901 (2005). |
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