+++Online Kolloquium+++ Quantum Light from Four-Wave Mixing with a Dark Atom (M. Sc. Bo Wang)

Datum: 14.07.2020
Uhrzeit: 14:30
Vortragende(r): M. Sc. Bo Wang
Quantum Dynamics Division, MPQ
Ort: +++ONLINE KOLLOQUIUM+++

Single photons can be generated from a single atom strongly coupled to a optical cavity via a stimulated Raman adiabatic passage between two atomic ground states [1]. During the generation of the photon, the atom stays within the dark state of electromagnetically induced transparency(EIT) avoiding spontaneous decay from the excited state.

In contrast to this well-know scenario, here we present the theory and experimental result about generating quantum light continuously from an atom in the dark state via a four-wave mixing process. A coherent coupling is added between the atomic ground states to allow the coherent generation of multiple photons. This would usually result in the destruction of the dark state and the reappearance of spontaneous decay. However, in the dark states of the strongly coupled cavity EIT, two atomic ground states are entangled with different photonic states [2]. Such dark states are preserved from the local coupling that is applied only within the atomic Hilbert space, like the added coupling in four-wave mixing process. Additionally, the nonlinearity of the system allows us to control the quantum fluctuations of the generated light via a quantum Zeno effect.

^[1]Kuhn, A et al., Phys. Rev. Lett. 89(6), 067901 (2002)

^[2]Souza, J.A. et al., Phys. Rev. Lett. 111, 113602 (2013).

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