Millisecond coherence in a superconducting qubit

Increasing the degree of control over physical qubits is a crucial component of quantum computing research. We report a superconducting qubit of fluxonium type with the Ramsey coherence time reaching \(T_2^*= 1.48 \pm 0.13 \mathrm{~ms}\), which exceeds the state of the art value by an order of magni...

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Bibliographic Details
Published in:arXiv.org 2021-03
Main Authors: Somoroff, Aaron, Ficheux, Quentin, Mencia, Raymond A, Xiong, Haonan, Kuzmin, Roman V, Manucharyan, Vladimir E
Format: Article
Language:English
Subjects:
Coherence
Elementary excitations
Forbidden transitions
Gates (circuits)
Quantum computing
Quantum theory
Qubits (quantum computing)
Superconductivity
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Summary:Increasing the degree of control over physical qubits is a crucial component of quantum computing research. We report a superconducting qubit of fluxonium type with the Ramsey coherence time reaching \(T_2^*= 1.48 \pm 0.13 \mathrm{~ms}\), which exceeds the state of the art value by an order of magnitude. As a result, the average single-qubit gate fidelity grew above \(0.9999\), surpassing, to our knowledge, any other solid-state quantum system. Furthermore, by measuring energy relaxation of the parity-forbidden transition to second excited state, we exclude the effect of out-of-equilibrium quasiparticles on coherence in our circuit. Combined with recent demonstrations of two-qubit gates on fluxoniums, our result paves the way for the next generation of quantum processors.
ISSN:2331-8422