Robust Error Accumulation Suppression
arxiv(2024)
摘要
We present an advanced quantum error suppression technique, which we dub
robust error accumulation suppression (REAS). Our method reduces the
accumulation of errors in any circuit composed of single- or two-qubit gates
expressed as e^-i σθ for Pauli operators σ and θ∈ [0,π); since such gates form a universal gate set, our results apply to
a strictly larger class of circuits than those comprising only Clifford gates,
thereby generalizing previous results. In the case of coherent errors – which
include crosstalk – we demonstrate a reduction of the error scaling in an
L-depth circuit from O(L) to O(√(L)). Crucially, REAS makes no
assumption on the cleanness of the error-suppressing protocol itself and is,
therefore, truly robust, applying to situations in which the newly inserted
gates have non-negligible coherent noise. Furthermore, we show that REAS can
also suppress certain types of decoherence noise by transforming some gates to
be robust against such noise, which is verified by the demonstration of the
quadratic suppression of error scaling in the numerical simulation. Our
results, therefore, present an advanced, robust method of error suppression
that can be used in conjunction with error correction as a viable path toward
fault-tolerant quantum computation.
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