Mitigation of Crosstalk Errors in a Quantum Measurement and Its Applications

• URL: http://arxiv.org/abs/2112.10651v1
• Date: Mon, 20 Dec 2021 16:20:49 GMT
• Title: Mitigation of Crosstalk Errors in a Quantum Measurement and Its Applications
• Authors: Seungchan Seo, Jiheon Seong, and Joonwoo Bae
• Abstract summary: We present a framework for mitigating measurement errors, for both individual and crosstalk errors. The mitigation protocol is realized in IBMQ Sydney and applied to the certification of entanglement-generating circuits.
• Score: 1.433758865948252
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: In practical realizations of quantum information processing, there may exist noise in a measurement readout stage where errors appear not only on individual qubits but also on multiple ones collectively, the latter of which is called crosstalk errors. In this work, we present a framework for mitigating measurement errors, for both individual and crosstalk errors. The mitigation protocol consists of two steps, firstly quantum pre-processing, which applies local unitary transformations before a measurement, and classical post-processing that manipulates measurement outcomes to recover noiseless data. The local unitaries in quantum pre-processing can be constructed by characterizing a noisy measurement via quantum detector tomography. We show that the mitigation protocol can maintain a measurement error on multiple qubits as much as that in a single-qubit readout, i.e., the error rates for measurements on multiple qubits are suppressed up to a percent level. The mitigation protocol is realized in IBMQ Sydney and applied to the certification of entanglement-generating circuits. It is demonstrated that the mitigation protocol can successfully eliminate measurement errors so that entanglement-generation circuits can be efficiently certified.

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