Universal Stabilization of a Parametrically Coupled Qubit

Physical Review Letters
Yao LuDavid I Schuster

Abstract

We autonomously stabilize arbitrary states of a qubit through parametric modulation of the coupling between a fixed frequency qubit and resonator. The coupling modulation is achieved with a tunable coupling design, in which the qubit and the resonator are connected in parallel to a superconducting quantum interference device. This allows for quasistatic tuning of the qubit-cavity coupling strength from 12 MHz to more than 300 MHz. Additionally, the coupling can be dynamically modulated, allowing for single-photon exchange in 6 ns. Qubit coherence times exceeding 20  μs are maintained over the majority of the range of tuning, limited primarily by the Purcell effect. The parametric stabilization technique realized using the tunable coupler involves engineering the qubit bath through a combination of photon nonconserving sideband interactions realized by flux modulation, and direct qubit Rabi driving. We demonstrate that the qubit can be stabilized to arbitrary states on the Bloch sphere with a worst-case fidelity exceeding 80%.

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Citations

Feb 27, 2018·Physical Review Letters·Eliot Kapit
Feb 8, 2019·Nature·Ruichao MaDavid I Schuster
May 15, 2018·Physical Review Letters·N EarnestD I Schuster
May 31, 2019·Physical Review Letters·Michele C CollodoChristopher Eichler
Apr 10, 2021·Physical Review Letters·Léa BresqueAlexia Auffèves
May 27, 2021·Nature Communications·Takuma MakiharaJunichiro Kono
Oct 13, 2021·Nature Communications·Yu ZhouShengyu Zhang

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