Multi-qubit noise deconvolution and characterization

• URL: http://arxiv.org/abs/2207.12386v2
• Date: Tue, 13 Sep 2022 09:53:21 GMT
• Title: Multi-qubit noise deconvolution and characterization
• Authors: Simone Roncallo, Lorenzo Maccone, Chiara Macchiavello
• Abstract summary: We present a noise deconvolution technique for obtaining noiseless expectation values of noisy observables at the output of n-qubits quantum channels. Our protocol applies to any noise model and for any number of qubits, also in presence of correlations.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We present a noise deconvolution technique for obtaining noiseless expectation values of noisy observables at the output of n-qubits quantum channels. Our protocol applies to any noise model and for any number of qubits, also in presence of correlations. For a generic observable affected by Pauli noise it provides a quadratic speed up, always producing a rescaling of its Pauli basis components. It is possible to achieve the deconvolution while experimentally estimating the noise parameters, whenever these are unknown (bypassing resource-heavy techniques like process tomography). We provide several examples and a simulation.

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