Nanosecond quantum state detection in a current biased dc SQUID

Details Nanosecond quantum state detection in a current biased dc SQUID Nanosecond quantum state detection in a current biased dc SQUID

2007-02-20

arxiv.org/abs/cond-mat/0702453v1

Physics

Condensed Matter

Superconductivity

10 pages, 8 figures

Scientific paper

10.1103/PhysRevB.76.024508

This article presents our procedure to measure the quantum state of a dc SQUID within a few nanoseconds, using an adiabatic dc flux pulse. Detection of the ground state is governed by standard macroscopic quantum theory (MQT), with a small correction due to residual noise in the bias current. In the two level limit, where the SQUID constitutes a phase qubit, an observed contrast of 0.54 indicates a significant loss in contrast compared to the MQT prediction. It is attributed to spurious depolarization (loss of excited state occupancy) during the leading edge of the adiabatic flux measurement pulse. We give a simple phenomenological relaxation model which is able to predict the observed contrast of multilevel Rabi oscillations for various microwave amplitudes.

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