Non-Markovian memory in IBMQX4

Abstract

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.

8 pages

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Cited by in corpus (9)

• Quantum Crosstalk Robust Quantum Control
• Machine learning classification of non-Markovian noise disturbing quantum dynamics
• Semi-device-independent certification of quantum non-Markovianity using sequential Random Access Codes
• Entanglement-breaking channels are a quantum memory resource
• Hamiltonian characterisation of multi-time processes with classical memory
• Multi-time quantum process tomography on a superconducting qubit
• A de Finetti theorem for quantum causal structures
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• Blind-spots of Randomized Benchmarking Under Temporal Correlations