Superconducting qubit manipulated by fast pulses: experimental observation of distinct decoherence regimes

Details Superconducting qubit manipulated by fast pulses: experimental observation of distinct decoherence regimes Superconducting qubit manipulated by fast pulses: experimental observation of distinct decoherence regimes

2011-10-07

arxiv.org/abs/1110.1508v1

New J. Phys. 14 (2012) 023031

Physics

Condensed Matter

Superconductivity

16 pages, 9 figures

Scientific paper

A particular superconducting quantum interference device (SQUID)qubit, indicated as double SQUID qubit, can be manipulated by rapidly modifying its potential with the application of fast flux pulses. In this system we observe coherent oscillations exhibiting non-exponential decay, indicating a non trivial decoherence mechanism. Moreover, by tuning the qubit in different conditions (different oscillation frequencies) by changing the pulse height, we observe a crossover between two distinct decoherence regimes and the existence of an "optimal" point where the qubit is only weakly sensitive to intrinsic noise. We find that this behaviour is in agreement with a model considering the decoherence caused essentially by low frequency noise contributions, and discuss the experimental results and possible issues.

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