Energy Relaxation Time between Macroscopic Quantum Levels in a Superconducting Persistent Current Qubit
Yang Yu, D. Nakada, Janice C. Lee, Bhuwan Singh, D. S. Crankshaw, T. P. Orlando, William D. Oliver, Karl K. Berggren
Abstract
We measured the intrawell energy relaxation time τd 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 τd, is longer than 20 microseconds, holding the promise of building a quantum computer with Nb-based superconducting qubits.
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