Autonomous Stabilization of Fock States in an Oscillator against Multiphoton Losses

Abstract

Fock states with a well-defined number of photons in an oscillator have shown a wide range of applications in quantum information science. Nonetheless, their usefulness has been marred by single and multiple photon losses due to unavoidable environment-induced dissipation. Though several dissipation engineering methods have been developed to counteract the leading single-photon loss error, averting multiple photon losses remains elusive. Here, we experimentally demonstrate a dissipation engineering method that autonomously stabilizes multi-photon Fock states against losses of multiple photons using a cascaded selective photon-addition operation in a superconducting quantum circuit. Through measuring the photon-number populations and Wigner tomography of the oscillator states, we observe a prolonged preservation of nonclassical Wigner negativities for the stabilized Fock states $|N⟩$ with $N=1,2,3$ for a duration of about 10 ms. Furthermore, the dissipation engineering method demonstrated here also facilitates the implementation of a non-unitary operation for resetting a binomially-encoded logical qubit. These results highlight potential applications in error-correctable quantum information processing against multi-photon-loss errors.

Main text: 6 pages, 4 figures; Supplementary material: 7 pages, 5 figures, 4 tables

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• Clifford operations and homological codes for rotors and oscillators
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• Benchmarking the performance of a high-Q cavity qudit using random unitaries
• Arbitrary high-fidelity binomial codes from multiphoton spin-boson interactions