CQuIC Seminars
Harnessing the atom-light interaction for quantum memory and novel quantum states
Presented by Lindsay LeBlanc (University of Alberta)
Cold and ultracold atoms are effective and versatile as a quantum medium: their intrinsic identicality and interactivity across the electromagnetic spectrum give them advantages in several applications. One application of this light-matter interaction is in quantum memory, where we store and manipulate photonic signals using laser-cooled rubidium atoms. Here, we study two memory protocols in an ultracold (sometimes Bose-condensed) sample of atoms to develop broadband light storage -- the Autler-Townes splitting (ATS) [1,2] and superradiant [3] approaches -- which result in high-performance memory, along with an increase in storage time associated with the lower temperatures and reduction in thermal diffusion. Another application of harnessing the light-matter interactions in atoms is in creating novel quantum states. Recently, we have created qutrits [4] -- the three-state generalization of the qubit -- in ultracold atoms using coherent control with microwave pulses. We are also exploring holonomic operations in BECs to realize states with nontrivial topological character, achieved via engineered degeneracies in a Floquet-driven system.
[1] E.Saglamyurek, T. Hrushevskyi, A. Rastogi, K. Heshami, and L. J. LeBlanc. Nature Photonics, 12, 774–782 (2018).
[2] E. Saglamyurek, T. Hrushevskyi, A. Rastogi, L. W. Cooke, B. D. Smith, and L. J. LeBlanc. New J. Phys. 23 043028 (2021).
[3] A. Rastogi, E Saglamyurek, T Hrushevskyi, L. J. LeBlanc. Phys. Rev. Lett. 129, 120502 (2022)
[4] J. Lindon, A. Tashchilina, L. W. Cooke, L. J. LeBlanc. arXiv:2208.00045
3:30 pm, Thursday, December 15, 2022
PAIS-2540, PAIS
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