Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 60: Quantum Effects (Cavity QED)
Q 60.8: Talk
Friday, March 13, 2020, 12:45–13:00, f442
Continuous Quantum Light from a Dark Atom: Experiment — •Christopher Ianzano1, Nicolas Tolazzi1, Bo Wang1, Celso Villas-Boas2, and Gerhard Rempe1 — 1Max Planck Institute for Quantum Optics — 2Universidade Federal de Sao Carlo
Cavity QED has been shown to be a powerful tool in atomic physics and quantum optics experiments. In a conventional lambda-type cavity EIT system, a ladder of dark states that are harmonic in intracavity photon number is generated. By Closing the lambda system with a field (or in our case a Raman pair) that directly couples the two ground states, transitions are driven between these dark states. We demonstrate experimentally a four-wave-mixing scheme where the field emitted from the cavity shifts frequency as the sum-difference frequency of the three input fields. Additionally, the output photon statistics are analyzed as a function of input field strengths, and a Zeno-blockade effect is observed. For weak driving, the system is constrained very well to the ground state and the first dark state, but as the driving strength is increased, the blockade is lifted and higher photon number dark states are accessed. Additionally, because the transitions driven are all dark states, the atomic excited state is not populated. In the high-driving limit, we show a field that is increasingly coherent without significantly increasing the average photon number, allowing us to tune the output photon statistics without changing the intracavity field.