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  • Open Access

Universal squeezing-enhanced readout approach for bosonic qubits

Yuan Qiu1, Yiming Yu1, Ye-Hong Chen1,2,*, and Yan-Xia1,†

  • 1Fujian Key Laboratory of Quantum Information and Quantum Optics, College of Physics and Information Engineering, Fuzhou University, Fuzhou 350108, China
  • 2Quantum Information Physics Theory Research Team, Center for Quantum Computing, RIKEN, Wako-shi, Saitama 351-0198, Japan

  • *Contact author: yehong.chen@fzu.edu.cn
  • †Contact author: xia-208@163.com
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Phys. Rev. Research 8, 033365 – Published 28 September, 2026

DOI: https://doi.org/10.1103/xv37-xwmk

Abstract

In this article, we propose a squeezing-enhanced protocol for the efficient readout of bosonic qubits, whose encoding states can be first mapped onto a multilevel atom and then read out via dispersive coupling. We demonstrate that by simultaneously applying intracavity and external squeezing for the readout of this multilevel atom, the measurement signal-to-noise ratio between adjacent energy levels can be exponentially enhanced. We begin by examining this enhancement in a three-level system and subsequently extend the framework to multilevel systems, proving that the signal-to-noise ratio between any adjacent energy levels can achieve a similar exponential improvement. This dual-squeezing approach leads to an exponential enhancement in both the dispersive coupling strength and the signal-to-noise ratio. As a result, the single-shot readout time is exponentially shortened and the single-shot measurement error is exponentially reduced, ultimately improving the single-shot readout fidelity of bosonic qubits by more than an order of magnitude. This method provides an effective pathway for high-fidelity readout based on bosonic encoding.

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Phys. Rev. Research 8, 033365– Published 28 September, 2026
  • Received 13 April 2026
  • Accepted 5 September 2026
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