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Nonreciprocal multiphoton bundle emission in a spinning resonator

Xue Gao, Jun Xu*, and Xiangming Hu†

  • *Contact author: junxu@ccnu.edu.cn
  • †Contact author: xmhu@ccnu.edu.cn
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Phys. Rev. Research 8, 033090 – Published 22 July, 2026

DOI: https://doi.org/10.1103/n1pp-vwbg

Abstract

We propose a scheme to realize nonreciprocal multiphoton bundle emission in a spinning resonator. The system consists of a rotating two-mode cavity directly coupled to a two-level atom, enabling efficient excitation of the desired multiphoton bundle states. These photon bundles originate from leapfrog transitions between dressed states, established through the coherent atom-cavity coupling under multiphoton resonance conditions. When the rotating resonator is driven in different directions, it generates opposite Sagnac-Fizeau shifts, making the resonant conditions dependent on the direction. As a consequence, distinct multiphoton transition channels can be selectively activated by tuning the driving direction and frequency. The nonreciprocal two-photon or three-photon bundle emission with the same and different modes can be implemented with a high tunability. This scheme provides a feasible route toward direction-controlled multiphoton emitters with potential applications in chiral quantum information processing.

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Phys. Rev. Research 8, 033090– Published 22 July, 2026
  • Received 3 February 2026
  • Accepted 8 July 2026
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