Impact of time-ordered measurements of the two states in a niobium superconducting qubit structure

Details Impact of time-ordered measurements of the two states in a niobium superconducting qubit structure Impact of time-ordered measurements of the two states in a niobium superconducting qubit structure

2003-02-26

arxiv.org/abs/cond-mat/0302553v1

Phys. Rev. B 67, 220506 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

14 pages, 4 figures

Scientific paper

10.1103/PhysRevB.67.220506

Measurements of thermal activation are made in a superconducting, niobium Persistent-Current (PC) qubit structure, which has two stable classical states of equal and opposite circulating current. The magnetization signal is read out by ramping the bias current of a DC SQUID. This ramping causes time-ordered measurements of the two states, where measurement of one state occurs before the other. This time-ordering results in an effective measurement time, which can be used to probe the thermal activation rate between the two states. Fitting the magnetization signal as a function of temperature and ramp time allows one to estimate a quality factor of 10^6 for our devices, a value favorable for the observation of long quantum coherence times at lower temperatures.

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