Multi-exponential error extrapolation and combining error mitigation techniques for NISQ applications

نویسندگان

چکیده

Noise in quantum hardware remains the biggest roadblock for implementation of computers. To fight noise practical application near-term computers, instead relying on error correction which requires large qubit overhead, we turn to mitigation, make use extra measurements. Error extrapolation is an mitigation technique that has been successfully implemented experimentally. Numerical simulation and heuristic arguments have indicated exponential curves are effective circuit limit with expected count around unity. In this article, extend multi-exponential provide more rigorous proof its effectiveness under Pauli noise. This further validated via our numerical simulations, showing orders magnitude improvements estimation accuracy over single-exponential extrapolation. Moreover, develop methods combine two other techniques: quasi-probability symmetry verification, through exploiting features these individual techniques. As shown simulation, combined method can achieve low bias a sampling cost multiple times smaller than while without needing be able adjust rate as required canonical

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ژورنال

عنوان ژورنال: npj Quantum Information

سال: 2021

ISSN: ['2056-6387']

DOI: https://doi.org/10.1038/s41534-021-00404-3