Autonomous Stabilization of Fock States in an Oscillator against Multiphoton Losses

• Published in: arXiv.org
• Main Authors: Li, Sai, Ni, Zhongchu, Zhang, Libo, Cai, Yanyan, Mai, Jiasheng, Wen, Shengcheng, Pan, Zheng, Deng, Xiaowei, Liu, Song, Xu, Yuan, Yu, Dapeng
• Format: Paper Journal Article
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 17.05.2024
• Subjects: Circuits; Coherence; Data processing; Dissipation; Error correction; Fock state; Oscillators; Photons; Physics - Quantum Physics; Quantum phenomena; Qubits (quantum computing)
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.2308.08296

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 \(\vert N\rangle\) 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.