Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 30: Quantum Sensing: Applications I

FM 30.4: Talk

Dienstag, 24. September 2019, 15:00–15:15, Aula

The photonic Bose–Einstein condensate as a precision quantum sensor — •Stefan Yoshi Buhmann^1,2 and Robert Bennett^1,2 — ¹University of Freiburg, Germany — ²Freiburg Institute for Advanced Studies (FRIAS), Germany

Photonic Bose–Einstein condensates have recently been realised as a new quantum state of light. Here, the photons inside a driven dye-filled cavity macroscopically occupy the ground state. We demonstrate that this extreme selectivity of the ground state can be exploited to construct a quantum sensor for the intra-cavity medium.

We propose to monitor the polarisation degree of freedom of the photonic Bose–Einstein condensate signal emerging from the cavity [2]. When introducing anisotropic or chiral molecules into the cavity, this polarisation will be governed by the handedness or the orientation of these molecules, respectively. In this way, enantiomeric excess or molecular anisotropy can be monitored in real time with unprecedented precision [3].

• [1] J. Klaers, J. Schmitt, F. Vewinger, M. Weitz, Nature 468, 545 (2010).
• [2] R. I. Moodie, P. Kirton, J. Keeling, Phys. Rev. A 96, 043844 (2017).
• [3] R. Bennett, Y. Gorbachev, S. Y. Buhmann, preprint arXiv:1905.07590 (2019).