Squeezed-light generation from multilevel atoms

Sotirios A. Hadjiagapiou

В. Н. Горбачев, Andrew I. Trubilko

E. Giacobino

Zhan Shi-chang

Based on the scheme for generation of dark squeezed states for two-level atoms proposed by J. I. Cirac et al., the generation principle of dark squeezed states for multilevel atoms is investigated in this paper. It has been shown that for multilevel atomic systems, laser cooling can also be conducted on trapped atoms to generate dark squeezed states. Consequently, a scheme for generation of squeezed states for multilevel atomic systems is put forward.

Bhuvanesh Sundar, Diego Barberena, Ana María Rey +1 more

We utilize multilevel atoms trapped in a driven resonant optical cavity to produce scalable multimode squeezed states for quantum sensing and metrology. While superradiance or collective dissipative emission by itself has been typically a detrimental effect for entanglement generation in optical cavities, in the presence of additional drives it can also be used as an entanglement resource. In a recent work [B. Sundar, D. Barberena, A. M. Rey, and A. Pi\~neiro Orioli, companion paper, Phys. Rev. Lett. 132, 033601 (2024)], we described a protocol for the dissipative generation of two-mode squeezing in the dark state of a six-level system with only one relevant polarization. There we showed that up to two quadratures can be squeezed. Here, we develop a generalized analytic treatment to calculate the squeezing in any multilevel system where atoms can collectively decay by emitting light into two polarization modes in a cavity. We show that in this more general system up to four spin squeezed quadratures can be obtained. We study how finite-size effects constrain the reachable squeezing, and analytically compute the scaling with $N$. Our findings are readily testable in current optical cavity experiments with alkaline-earth-like atoms.

M. Arif