Demonstration of Protection of a Superconducting Qubit from Energy Decay

Physical Review Letters
Yen-Hsiang LinVladimir E Manucharyan

Abstract

Long-lived transitions occur naturally in atomic systems due to the abundance of selection rules inhibiting spontaneous emission. By contrast, transitions of superconducting artificial atoms typically have large dipoles, and hence their lifetimes are determined by the dissipative environment of a macroscopic electrical circuit. We designed a multilevel fluxonium artificial atom such that the qubit's transition dipole can be exponentially suppressed by flux tuning, while it continues to dispersively interact with a cavity mode by virtual transitions to the noncomputational states. Remarkably, energy decay time T_{1} grew by 2 orders of magnitude, proportionally to the inverse square of the transition dipole, and exceeded the benchmark value of T_{1}>2  ms (quality factor Q_{1}>4×10^{7}) without showing signs of saturation. The dephasing time was limited by the first-order coupling to flux noise to about 4  μs. Our circuit validated the general principle of hardware-level protection against bit-flip errors and can be upgraded to the 0-π circuit [P. Brooks, A. Kitaev, and J. Preskill, Phys. Rev. A 87, 052306 (2013)PLRAAN1050-294710.1103/PhysRevA.87.052306], adding protection against dephasing and certain gate errors.

References

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May 15, 2018·Physical Review Letters·N EarnestD I Schuster

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Citations

May 1, 2019·Nature Materials·Lukas GrünhauptIoan M Pop
Sep 19, 2019·Nature Communications·Youngkyu SungWilliam D Oliver
Apr 24, 2019·Physical Review Letters·T M HazardA A Houck
Apr 2, 2019·Physical Review Letters·Tongxing YanDapeng Yu
May 15, 2018·Physical Review Letters·N EarnestD I Schuster
Aug 17, 2020·Physical Review Letters·T W LarsenC M Marcus

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