SAMOP 2023 – scientific programme

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SYQR: Symposium Quantum Optics and Quantum Information with Rigid Rotors

SYQR 2: Quantum Optics and Quantum Information with Rigid Rotors 2

SYQR 2.4: Invited Talk

Friday, March 10, 2023, 16:00–16:30, E415

Full control over randomly oriented quantum rotors: controllability analysis and application to chiral observables — •Monika Leibscher — Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, Berlin, Germany

Full quantum control over randomly oriented molecules requires complete breaking of the rotational symmetry by external fields. We present a graphical method to analyze the controllability of quantum asymmetric tops and determine the number, polarization and frequencies of the external fields which are required to fully control the rotational dynamics [1,2]. The results of the controllability analysis allow us to design pulse sequences which drive the molecules to the desired target states. We apply this strategy to observe and control chiral properties in randomly rotating molecules [1]. As an example, we discuss the creation of chiral wavepackets in achiral molecules. Planar molecules can become temporarily chiral upon coherent excitation of the out-of-plane vibration [3]. With the help of controllability analysis, we identify different excitation schemes that result in a net chiral signal and simulate the resulting ro-vibrational dynamics.

[1] M. Leibscher, E. Pozzoli, C. Pérez, M. Schnell, M. Sigalotti, U. Boscain, C. P. Koch, Commun. Phys. 5, 110 (2022). [2] E. Pozzoli, M. Leibscher, M. Sigalotti, U. Boscain and C. P. Koch, J. Phys. A: Math. Theor. 55, 215301 (2022). [3] D. S. Tikhonov, A. Blech, M. Leibscher, L. Greeman, M. Schnell, and C. P. Koch, Science Advances in press (2022).