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  • Letter
  • Open Access

Fast generation of high-fidelity mechanical non-Gaussian states via additional amplifier and photon subtraction

Dong-Long Hu1, Jia-Jin Zou1, Feng-Xiao Sun2, Jie-Qiao Liao3, Qiongyi He2, and Ze-Liang Xiang1,*

  • 1School of Physics, Sun Yat-sen University, Guangzhou 510275, China
  • 2State Key Laboratory for Mesoscopic Physics, School of Physics, Frontiers Science Center for Nano-Optoelectronics, and Collaborative Innovation Center of Quantum Matter, Peking University, Beijing 100871, China
  • 3Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Key Laboratory for Matter Microstructure and Function of Hunan Province, Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha 410081, China

  • *xiangzliang@mail.sysu.edu.cn
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Phys. Rev. Research 5, L032031 – Published 6 September, 2023

DOI: https://doi.org/10.1103/PhysRevResearch.5.L032031

Abstract

Non-Gaussian states (NGSs) with higher-order correlation properties have wide-range applications in quantum information processing. However, the generation of such states with high quality still faces practical challenges. Here, we propose a protocol to faithfully generate two types of mechanical NGSs, i.e., Schrödinger cat states and Fock states, in open optomechanical systems, even when the cooperativity is smaller than one (g2/κγ<1). In contrast to the usual scheme, a short squeezed field is pumped to rapidly entangle with a mechanical resonator via a beam-splitter-like optomechanical interaction, effectively reducing the mechanical decoherence. Furthermore, by performing an additional amplifier and a following multiphoton subtraction on the entangled optical field, one can selectively obtain the high-fidelity mechanical cat and Fock states. This protocol is robust to various imperfections, allowing it to be implemented with state-of-the-art experimental systems with close to unit fidelity. Moreover, it can be extended to generate a four-component cat state and provide possibilities for future quantum applications of NGSs.

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Phys. Rev. Research 5, L032031– Published 6 September, 2023
  • Received 12 November 2022
  • Accepted 25 August 2023
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