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In a recent work a quantum error mitigation protocol was applied to the expectation values obtained from circuits on the IBM Eagle quantum processor with up $127$ - qubits with up to $60 \; - \; \mbox{CNOT}$ layers.
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2022
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We note that the bra and ket legs of the operator must be evolved together, without truncation in between. If not, evolution of a Pauli string under a non-trivial Clifford circuit is not guaranteed to yield a single Pauli string
Cited in the paper.
We simply evaluate the expectation value of the doubled operator Z ⊗ Z Z\otimes Z using the vectorized MPO as an MPS
Cited in the paper.
2023
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