You are cordially invited to the SCL seminar of the Center for the Study of Complex Systems, which will be held on Monday, 13 May 2024 at 14:00 in the library reading room “Dr. Dragan Popović" of the Institute of Physics Belgrade. The talk entitled

Angular Bloch oscillations and their applications

will be given by Dr. Maxim Efremov (German Aerospace Center - DLR, Institute of Quantum Technologies, Ulm, Germany). The abstract of the talk:

To advance precise inertial navigation, in this talk we will introduce a compact quantum sensor which is based on novel quantum phenomenon of the angular Bloch oscillations [1] and measures solely the angular acceleration of slow external rotation. We will present a study of the dynamics of ultracold atoms confined in a toroidal trap with a ring-lattice along the azimuth angle, realized with the superposition of two co-propagating Laguerre-Gaussian beams. In the presence of external rotation of small angular acceleration, or prescribed linear chirp between the two beams, the measured angular momentum of trapped atoms displays a specific periodic behavior in time, which we name as the angular Bloch oscillations. This discovered quantum phenomenon is shown to be a key element of fruitful applications for an efficient transfer of quantized angular momentum from light field to atoms, and realization of compact quantum sensor to measure exclusively the angular acceleration of external rotation.

[1] B. Konrad and M. Efremov, arXiv:2402.12826 (2024).

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