Millisecond Coherence in a Superconducting Qubit.

Autor:	Somoroff A; Department of Physics, Joint Quantum Institute, and Quantum Materials Center, University of Maryland, College Park, Maryland 20742, USA., Ficheux Q; Department of Physics, Joint Quantum Institute, and Quantum Materials Center, University of Maryland, College Park, Maryland 20742, USA., Mencia RA; Department of Physics, Joint Quantum Institute, and Quantum Materials Center, University of Maryland, College Park, Maryland 20742, USA., Xiong H; Department of Physics, Joint Quantum Institute, and Quantum Materials Center, University of Maryland, College Park, Maryland 20742, USA., Kuzmin R; Department of Physics, Joint Quantum Institute, and Quantum Materials Center, University of Maryland, College Park, Maryland 20742, USA., Manucharyan VE; Department of Physics, Joint Quantum Institute, and Quantum Materials Center, University of Maryland, College Park, Maryland 20742, USA.; École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.
Jazyk:	angličtina
Zdroj:	Physical review letters [Phys Rev Lett] 2023 Jun 30; Vol. 130 (26), pp. 267001.
DOI:	10.1103/PhysRevLett.130.267001
Abstrakt:	Improving control over physical qubits is a crucial component of quantum computing research. Here we report a superconducting fluxonium qubit with uncorrected coherence time T_{2}^{*}=1.48±0.13  ms, exceeding the state of the art for transmons by an order of magnitude. The average gate fidelity was benchmarked at 0.99991(1). Notably, even in the millisecond range, the coherence time is limited by material absorption and could be further improved with a more rigorous fabrication. Our demonstration may be useful for suppressing errors in the next generation quantum processors.
Databáze:	MEDLINE
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