Robust quantum control against clock noises in multiqubit systems Article Swipe
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· 2019
· Open Access
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· DOI: https://doi.org/10.1103/physreva.100.022302
· OA: W2924611848
High-precision manipulation of multi-qubit quantum systems requires strictly\nclocked and synchronized multi-channel control signals. However, practical\nArbitrary Waveform Generators (AWGs) always suffer from random signal jitters\nand channel latencies that induces non-ignorable state or gate operation\nerrors. In this paper, we analyze the average gate error caused by clock\nnoises, from which an estimation formula is derived for quantifying the control\nrobustness against clock noises. This measure is then employed for finding\nrobust controls via a homotopic optimization algorithm. We also introduce our\nrecently proposed stochastic optimization algorithm, b-GRAPE, for training\nrobust controls via randomly generated clock noise samples. Numerical\nsimulations on a two-qubit example demonstrate that both algorithms can greatly\nimprove the control robustness against clock noises. The homotopic algorithm\nconverges much faster than the b-GRAPE algorithm, but the latter can achieve\nmore robust controls against clock noises.\n
