Phys. Rev. Lett. 92, 117904 (2004) [4 pages]Energy Relaxation Time between Macroscopic Quantum Levels in a Superconducting Persistent-Current QubitReceived 28 October 2003; published 18 March 2004 We measured the intrawell energy relaxation time τd≃24 μs between macroscopic quantum levels in the double well potential of a Nb persistent-current qubit. Interwell population transitions were generated by irradiating the qubit with microwaves. Zero population in the initial well was then observed due to a multilevel decay process in which the initial population relaxed to lower energy levels during the driven transitions. The decoherence time, estimated from τd within the spin-boson model, is about 20 μs for this configuration with a Nb superconducting qubit. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.117904
DOI:
10.1103/PhysRevLett.92.117904
PACS:
03.67.Pp, 03.65.Yz, 85.25.Cp, 85.25.Dq
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