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Measurements of thermal activation are made in a superconducting, niobiumPersistent-Current (PC) qubit structure, which has two stable classical statesof equal and opposite circulating current. The magnetization signal is read outby ramping the bias current of a DC SQUID. This ramping causes time-orderedmeasurements of the two states, where measurement of one state occurs beforethe other. This time-ordering results in an effective measurement time, whichcan be used to probe the thermal activation rate between the two states.Fitting the magnetization signal as a function of temperature and ramp timeallows one to estimate a quality factor of 10^6 for our devices, a valuefavorable for the observation of long quantum coherence times at lowertemperatures.Comment: 14 pages, 4 figure

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