Millisecond coherence in a superconducting qubit

• URL: http://arxiv.org/abs/2103.08578v1
• Date: Mon, 15 Mar 2021 17:47:02 GMT
• Title: Millisecond coherence in a superconducting qubit
• Authors: Aaron Somoroff, Quentin Ficheux, Raymond A. Mencia, Haonan Xiong, Roman V. Kuzmin, Vladimir E. Manucharyan
• Abstract summary: We report a superconducting qubit of fluxonium type with the Ramsey coherence time reaching $T*= 1.48 pm 0.13 mathrmms$. Average single-qubit gate fidelity grew above $0.9999$, surpassing any other solid-state quantum system.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

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