Energy Relaxation Time between Macroscopic Quantum Levels in a Superconducting Persistent Current Qubit

Details Energy Relaxation Time between Macroscopic Quantum Levels in a Superconducting Persistent Current Qubit Energy Relaxation Time between Macroscopic Quantum Levels in a Superconducting Persistent Current Qubit

2003-11-12

arxiv.org/abs/cond-mat/0311289v2

Physics

Condensed Matter

Superconductivity

18 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.92.117904

We measured the intrawell energy relaxation time \tau_{d} 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 multi-level decay process in which the initial population relaxed to the lower energy levels during transitions. The qubit's decoherence time, determined from \tau_{d}, is longer than 20 microseconds, holding the promise of building a quantum computer with Nb-based superconducting qubits.

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