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- W4286981833 abstract "The inevitable accumulation of errors in near-future quantum devices represents a key obstacle in delivering practical quantum advantages, motivating the development of various quantum error-mitigation methods. Here, we derive fundamental bounds concerning how error-mitigation algorithms can reduce the computation error as a function of their sampling overhead. Our bounds place universal performance limits on a general error-mitigation protocol class. We use them to show (1) that the sampling overhead that ensures a certain computational accuracy for mitigating local depolarizing noise in layered circuits scales exponentially with the circuit depth for general error-mitigation protocols and (2) the optimality of probabilistic error cancellation among a wide class of strategies in mitigating the local dephasing noise on an arbitrary number of qubits. Our results provide a means to identify when a given quantum error-mitigation strategy is optimal and when there is potential room for improvement." @default.
- W4286981833 created "2022-07-25" @default.
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- W4286981833 date "2022-09-22" @default.
- W4286981833 modified "2023-10-15" @default.
- W4286981833 title "Fundamental limits of quantum error mitigation" @default.
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- W4286981833 doi "https://doi.org/10.1038/s41534-022-00618-z" @default.
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