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Non-Markovian memory in IBMQX4

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arxiv 1902.07980 v1 pith:K6WD6BKV submitted 2019-02-21 quant-ph

classification quant-ph
keywords non-markoviangatememoryeffectsgatesperformancesizeaccounting
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We measure and quantify non-Markovian effects in IBM's Quantum Experience. Specifically, we analyze the temporal correlations in a sequence of gates by characterizing the performance of a gate conditioned on the gate that preceded it. With this method, we estimate (i) the size of fluctuations in the performance of a gate, i.e., errors due to non-Markovianity; (ii) the length of the memory; and (iii) the total size of the memory. Our results strongly indicate the presence of non-trivial non-Markovian effects in almost all gates in the universal set. However, based on our findings, we discuss the potential for cleaner computation by adequately accounting the non-Markovian nature of the machine.

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  1. Experimental investigation of Markovian and non-Markovian channel addition

    quant-ph 2019-08 conditional novelty 6.0 of 10

    First photonic experiment demonstrating that mixing two Markovian channels can produce a non-Markovian channel, and that mixing two non-Markovian channels can appear Markovian under the distinguishability criterion.

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