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- W4282917726 abstract "Recently, several noise benchmarking algorithms have been developed to characterize noisy quantum gates on today's quantum devices. A well-known issue in benchmarking is that not everything about quantum noise is learnable due to the existence of gauge freedom, leaving open the question of what information about noise is learnable and what is not, which has been unclear even for a single CNOT gate. Here we give a precise characterization of the learnability of Pauli noise channels attached to Clifford gates, showing that learnable information corresponds to the cycle space of the pattern transfer graph of the gate set, while unlearnable information corresponds to the cut space. This implies the optimality of cycle benchmarking, in the sense that it can learn all learnable information about Pauli noise. We experimentally demonstrate noise characterization of IBM's CNOT gate up to 2 unlearnable degrees of freedom, for which we obtain bounds using physical constraints. In addition, we give an attempt to characterize the unlearnable information by assuming perfect initial state preparation. However, based on the experimental data, we conclude that this assumption is inaccurate as it yields unphysical estimates, and we obtain a lower bound on state preparation noise." @default.
- W4282917726 created "2022-06-16" @default.
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- W4282917726 date "2022-06-13" @default.
- W4282917726 modified "2023-09-27" @default.
- W4282917726 title "The learnability of Pauli noise" @default.
- W4282917726 doi "https://doi.org/10.48550/arxiv.2206.06362" @default.
- W4282917726 hasPublicationYear "2022" @default.
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