Murad Abuzarli
University of Vienna
website
Non-Hermitian dynamics and nonreciprocity of two optically coupled nanoparticles
Abstract: Optical levitation of dielectric objects in vacuum is a promising platform for the exploration of the mechanical quantum and nonequilibrium phenomena in the mesoscopic regime. In our experiment we aim at employing the tunable light induced nonreciprocal interaction between the particles in a tweezer array for the exploration of their collective dynamics in the quantum regime. I will first present the nonhermitian and nonlinear dynamics of two nanoparticles coupled by stationary antireciprocal interaction [1]: a mechanical lasing transition once a threshold coupling rate, as well as the motional correlations revealed by a strong mechanical phase locking, both supported by our nonlinear theory model. I will then present our preliminary results with two particles coupled by the time modulated interactions, stemming from the optically detuned tweezers. Using different interaction reciprocities and the modulation frequencies, we realize and characterize the beamsplitter, single-mode squeezing and two-mode squeezing type interactions.
[1]: M. Reisenbauer, H. Rudolph, L. Egyed, K. Hornberger, A. V. Zasedatelev, M. Abuzarli, B. A. Stickler, and U. Delić, “Non-hermitian dynamics and nonreciprocity of optically coupled nanoparticles.”, Nature Physics 2024, ArXiv.2310.02610 (2023)
