Macroscopic tunnel splittings in superconducting phase qubits

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...

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Bibliographic Details
Published in:Physical review letters 2005-05, Vol.94 (18), p.187004.1-187004.4, Article 187004
Main Authors: JOHNSON, Philip R, PARSONS, William T, STRAUCH, Frederick W, ANDERSON, J. R, DRAGT, Alex J, LOBB, C. J, WELLSTOOD, F. C
Format: Article
Language:English
Subjects:
Applied sciences
Classical and quantum physics: mechanics and fields
Electronics
Exact sciences and technology
Physics
Quantum computation
Quantum information
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Superconducting devices
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.94.187004