Error rate reduction of single-qubit gates via noise-aware decomposition into native gates

In the current era of Noisy Intermediate-Scale Quantum (NISQ) technology, the practical use of quantum computers remains inhibited by our inability to aptly decouple qubits from their environment to mitigate computational errors. In this paper, we introduce an approach by which knowledge of a qubit’...

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Vydané v:	Scientific reports Ročník 12; číslo 1; s. 6379 - 10
Hlavní autori:	Maldonado, Thomas J., Flick, Johannes, Krastanov, Stefan, Galda, Alexey
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	London Nature Publishing Group UK 16.04.2022 Nature Publishing Group Nature Portfolio
Predmet:	639/705/258 639/766/25 639/766/259 639/766/483/1139 639/766/483/2802 639/766/483/481 applied physics CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS Computer applications Computers Decomposition Gates Humanities and Social Sciences information technology information theory and computation multidisciplinary Noise Noise levels quantum information quantum mechanics qubits Science Science (multidisciplinary)
ISSN:	2045-2322, 2045-2322
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Shrnutí:	In the current era of Noisy Intermediate-Scale Quantum (NISQ) technology, the practical use of quantum computers remains inhibited by our inability to aptly decouple qubits from their environment to mitigate computational errors. In this paper, we introduce an approach by which knowledge of a qubit’s initial quantum state and the standard parameters describing its decoherence can be leveraged to mitigate the noise present during the execution of a single-qubit gate. We benchmark our protocol using cloud-based access to IBM quantum processors. On ibmq_rome, we demonstrate a reduction of the single-qubit error rate by 38%, from 1.6 × 10 - 3 to 1.0 × 10 - 3 , provided the initial state of the input qubit is known. On ibmq_bogota, we prove that our protocol will never decrease gate fidelity, provided the system’s T 1 and T 2 times have not drifted above 100 times their assumed values. The protocol can be used to reduce quantum state preparation errors, as well as to improve the fidelity of quantum circuits for which some knowledge of the qubits’ intermediate states can be inferred. This paper presents a pathway to using information about noise levels and quantum state distributions to significantly reduce error rates associated with quantum gates via optimized decomposition into native hardware gates.
Bibliografia:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23 AC02-06CH11357 USDOE
ISSN:	2045-2322 2045-2322
DOI:	10.1038/s41598-022-10339-0