Experimental Bayesian estimation of quantum state preparation, measurement, and gate errors in multi-qubit devices

• URL: http://arxiv.org/abs/2108.10686v3
• Date: Thu, 10 Mar 2022 15:23:08 GMT
• Title: Experimental Bayesian estimation of quantum state preparation, measurement, and gate errors in multi-qubit devices
• Authors: Haggai Landa, Dekel Meirom, Naoki Kanazawa, Mattias Fitzpatrick, Christopher J. Wood
• Abstract summary: We self-consistently estimate up to seven parameters of each qubit's state preparation, readout, and gate errors. We demonstrate easily implemented approaches for mitigating different errors before a quantum experiment.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We introduce a Bayesian method for the estimation of single qubit errors in quantum devices, and use it to characterize these errors on three 27-qubit superconducting qubit devices. We self-consistently estimate up to seven parameters of each qubit's state preparation, readout, and gate errors, analyze the stability of these errors as a function of time, and demonstrate easily implemented approaches for mitigating different errors before a quantum computation experiment. On the investigated devices we find non-negligible qubit reset errors that cannot be parametrized as a diagonal mixed state, but manifest as a coherent phase of a superposition with a small contribution from the qubit's excited state. We are able to mitigate such errors by applying pre-rotations on the initialized qubits, which we demonstrate with multi-qubit entangled states. Our results demonstrate that Bayesian estimation can resolve small parameters - including those pertaining to quantum gate errors - with a high relative accuracy, at a lower measurement cost as compared with standard characterization approaches.

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