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Q: Fachverband Quantenoptik und Photonik

Q 20: Quantum Gases: Bosons II

Q 20.8: Vortrag

Dienstag, 7. März 2023, 12:45–13:00, F342

An Atomic Mode Parametric Amplifier Mediated by Cavity Photons — •Fabian Finger, Rodrigo Rosa-Medina, Nicola Reiter, Panagiotis Christodoulou, Tobias Donner, and Tilman Esslinger — Institute for Quantum Electronics, ETH Zürich, 8093 Zürich, Switzerland

Parametric amplification is a fundamental concept of nonlinear dynamics, occurring in fields so diverse as mechanics, electronics, and atomic physics. In the past, ultracold quantum gases exhibiting short-range contact interactions have been used to demonstrate parametric amplification of atomic modes. Here, we make use of global-range interactions in an optical cavity to realize a fast parametric amplifier producing atomic pairs in specific spin and momentum modes. Our implementation relies on Raman scattering between spin levels in a spinor Bose-Einstein condensate, induced by the interplay of a running-wave transverse laser and the vacuum field of the cavity. Detuned from Raman resonance, a four-photon process gives rise to effective spin-mixing dynamics. We observe pair production of signal and idler atoms in tens of microseconds and demonstrate its nonlinear character by varying the number of atoms in the pump reservoir. We extend our results to a regime exhibiting two concurring pair production channels and observe correlated momenta between the highly fluctuating signal and idler modes, verifying the phase matching condition of the parametric amplifier. Our results demonstrate a new experimental platform for fast atomic parametric amplification and provide prospects for matter-wave interferometry using entangled motional states.