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Generation of squeezed optical states via stored classical pulses in a Bose gas

Sevilay Sevinçli1, Dennis Rätzel2,3,4, Markus Krutzik5,6, Mehmet Özgür Oktel1, and Mustafa Gündoğan5,*

  • *Contact author: mustafa.guendogan@physik.hu-berlin.de
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Phys. Rev. Research 8, 033016 – Published 6 July, 2026

DOI: https://doi.org/10.1103/89xy-86yz

Abstract

We propose and analyze a scheme to generate squeezed light by storing a classical probe pulse in a Bose-Einstein condensate (BEC) and exploiting the nonlinear evolution caused by atom-atom collisions during the storage time. A Λ-type optical memory interface maps a chosen temporal probe mode onto a single phase-matched collective spin wave; for a coherent input, this prepares a tunable coherent spin state of a two-component BEC, with its initial spin orientation set by the stored mean excitation number and the phase relation between the probe and control fields. Collisional interactions during storage then implement one-axis-twisting dynamics and generate spin squeezing in the atomic ensemble. We account for realistic loss and finite memory and retrieval efficiencies, and model readout as a single-mode beam-splitter mapping that transfers the atomic quadrature squeezing onto a propagating optical mode. The model identifies optimal storage times and predicts that, under realistic conditions, several decibels of squeezing can be transferred to the retrieved light.

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Phys. Rev. Research 8, 033016– Published 6 July, 2026
  • Received 26 February 2026
  • Accepted 4 June 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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