Cavity Optomechanical Quantum Memory for Twisted Photons Using a Ring BEC

• URL: http://arxiv.org/abs/2506.06651v1
• Date: Sat, 07 Jun 2025 04:09:17 GMT
• Title: Cavity Optomechanical Quantum Memory for Twisted Photons Using a Ring BEC
• Abstract summary: We propose a quantum memory platform based on an atomic Bose-Einstein condensate confined in a ring trap and placed inside a Fabry-Perot cavity driven by Laguerre-Gaussian beams.<n>In contrast to electromagnetically induced transparency-based protocols, our memory does not require change of internal atomic levels.<n>The optical states are instead stored in the large Hilbert space of topologically protected and long-lived motional states (persistent currents) of the condensate, yielding a storage time three orders of magnitude better than presently available.
• Score: 14.293556887039504
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We theoretically propose a photonic orbital angular momentum (OAM) quantum memory platform based on an atomic Bose-Einstein condensate confined in a ring trap and placed inside a Fabry-Perot cavity driven by Laguerre-Gaussian beams. In contrast to electromagnetically induced transparency-based protocols, our memory does not require change of internal atomic levels. The optical states are instead stored in the large Hilbert space of topologically protected and long-lived motional states (persistent currents) of the condensate, yielding a storage time three orders of magnitude better than presently available. Further, the use of a cavity provides orders of magnitude more resonances, and hence bandwidth, for reading and writing than internal atomic transitions. Finally, the analogy to cavity optomechanics suggests a natural path to wavelength conversion, OAM transduction, and nondestructive readout of the memory.

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