Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 60: Quantum Effects (Cavity QED)
Q 60.7: Talk
Friday, March 13, 2020, 12:30–12:45, f442
Continuous Quantum Light from a Dark Atom: Theory — •Bo Wang1, Christopher Ianzano1, Nicolas Tolazzi1, Celso Villas-Boas2, and Gerhard Rempe1 — 1Max Planck Institute for Quantum Optics — 2Universidade Federal de Sao Carlo
Single photons can be generated from a single atom strongly coupled to an 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-known scenario, here we present the theoretical result to generate quantum light continuously from an atom in the dark state. 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, the dark states of the strongly coupled cavity EIT result from the interference between two atomic ground states entangled with different photonic states [2]. Such dark states are preserved from the local coupling that is applied only within the atomic Hilbert space. 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).