Speaker
Description
We report the first experimental realization of cold atoms interacting with an optical frequency comb (OFC) inside a high-finesse Fabry-Perot cavity in the dispersive regime. This is achieved by leveraging the narrow optical transition of the cold atoms, with a linewidth much smaller than the free spectral range of the cavity, allowing all cavity modes to be detuned far from atomic resonance and simultaneously excited by a multiple of frequency comb modes.
In the linear dispersive regime of light-matter interaction, we observe a collective frequency shift of multiple cavity modes in the spectrum of the transmitted OFC. In the nonlinear regime, we study bistability in the transmission of a single comb mode, induced by optical pumping in Zeeman ground states.
These results introduce a new approach to controlling light-matter interactions with multiple OFC modes in cavity-enhanced setups, paving the way for the implementation of recent proposals in cavity cooling [1], quantum annealing [2, 3], and quantum simulations [4].
References:
[1] Torggler, I. Krešić, T. Ban, and H. Ritsch, New Journal of Physics 22, 063003 (2020).
[2] V. Torggler, S. Krämer, and H. Ritsch, Phys. Rev. A 95, 032310 (2017).
[3] Torggler, P. Aumann, H. Ritsch, and W. Lechner, Quantum 3, 149 (2019).
[4] N. Masalaeva, H. Ritsch, and F. Mivehvar, Phys. Rev. Lett. 131, 173401 (2023).
