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Sci Rep. 2018 Oct 3;8(1):14740. doi: 10.1038/s41598-018-32989-9.

Creating a switchable optical cavity with controllable quantum-state mapping between two modes.

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Faculty of Physics, Adam Mickiewicz University, PL-61-614, Poznań, Poland.
Faculty of Physics, Adam Mickiewicz University, PL-61-614, Poznań, Poland.
RCPTM, Joint Laboratory of Optics of Palacký University and Institute of Physics of Academy of Sciences of the Czech Republic, 17. listopadu 12, 772 07, Olomouc, Czech Republic.
National Centre for Nanotechnology and Advanced Materials, KACST, P.O. Box 6086, Riyadh, 11442, Saudi Arabia.
Quantum Optics and Engineering Division, Institute of Physics, University of Zielona Góra, Szafrana 4a, Zielona Góra, 65-516, Poland.


We describe how an ensemble of four-level atoms in the diamond-type configuration can be applied to create a fully controllable effective coupling between two cavity modes. The diamond-type configuration allows one to use a bimodal cavity that supports modes of different frequencies or different circular polarisations, because each mode is coupled only to its own transition. This system can be used for mapping a quantum state of one cavity mode onto the other mode on demand. Additionally, it can serve as a fast opening high-Q cavity system that can be easily and coherently controlled with laser fields.

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