Pump-probe cavity optomechanics with a rotating atomic superfluid in a ring

Atomic superfluids confined in a ring provide a remarkable paradigm for quantized circulation. Very recently, a technique based on cavity optomechanics has been proposed [Kumar et al., Phys. Rev. Lett. 127, 113601 (2021)] for sensing and manipulating the rotation of a bosonic ring condensate with minimal destruction, in situ and in real time. Here, we theoretically investigate other coherent interference effects that can be supported by the proposed configuration. Specifically, in the presence of a strong control beam, we analyze the influence of atomic rotation on the transmission spectrum of a weak probe laser through a cavity containing a ring condensate. We present a detailed study of the resulting narrow probe transmission profiles and group delay and show that they can be tuned by means of persistent currents. Our results explore a facet of rotating matter waves and are relevant to applications such as atomtronics, sensing, and information processing.

Automated summary

A recent proposal based on cavity optomechanics enables the sensing and manipulation of rotation in a bosonic ring condensate, with minimal destruction and in real time. In this study, we investigate coherent interference effects supported by this configuration and analyze the influence of atomic rotation on the transmission spectrum of a weak probe laser. Our results show that the narrow probe transmission profiles and group delay can be tuned by persistent currents, offering potential applications in atomtronics, sensing, and information processing.