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Q: Fachverband Quantenoptik und Photonik
Q 22: Posters: Quantum Optics and Photonics II
Q 22.30: Poster
Dienstag, 10. März 2020, 16:30–18:30, Empore Lichthof
Climbing the Dark State Ladder of Cavity EIT — •Bo Wang1, Christopher Ianzano1, Nicolas Tolazzi1, Celso Villas-Boas2, and Gerhard Rempe1 — 1Max Planck Institute for Quantum Optics — 2Universidade Federal de Sao Carlo
Dark states in atomic physics are a well-known phenomenon where normally resonant transitions are rendered *dark.* One of the most common examples of this is in a lambda-type electromagnetically induced transparency system, where laser fields drive two transitions with the same excited state. The transition amplitudes interfere destructively, preventing excitation and forming a superposition of ground states. This dark state is fragile, and is typically destroyed by additional resonant fields. Adding a strongly-coupled cavity makes the dark state more robust to perturbations and generates an infinite harmonic ladder of dark states separated by one cavity photon. A coupling field between the ground states of the lambda system accesses higher rungs of the dark state ladder by driving transitions between dark states while generating photons as the system climbs and decays from states in the ladder. Because higher lying photon number states experience both a weaker driving and an increased decay, for weak driving the system cannot surpass the one-photon dark state. An increase in the driving strength will lift this blockade and higher states will become more accessible. We demonstrate the existence of this dark-state ladder, which can be seen by a change in photon statistics between the weak- and strong-driving regimes, as well as a significantly lower population in the excited state compared to a free space atom.