The Budapest Quantum Optics Group

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Subrecoil cavity cooling towards degeneracy: a numerical study

Raimar Sandner

(Institute for Theoretical Physics, University of Innsbruck)

Time: Tue Oct 8 14:00:00 2013
Location: Building 1, Room 114, Auditorium

We present a detailed numerical analysis of the temperature limit and timescale of cavity cooling of an ultracold dilute gas in the quantum regime for particles and light. For a cavity with a linewidth smaller than the recoil frequency, efficient cooling towards quantum degeneracy is facilitated by applying a tailored sequence of laser pulses transferring the particles towards lower momenta. Two-particle Monte Carlo wave function simulations reveal strongly improved cooling properties for a ring versus a standing wave geometry. Distinct quantum correlations and cooling limits for bosons and fermions demonstrate quantum statistical effects. In particular, in ring cavities, the photon-mediated long-range interaction favours momentum space pairing of bosons, while fermion pairs exhibit anti-correlated or uncorrelated momenta. The results are in good agreement with recent experiments and give encouraging prospects to replace evaporation by cavity cooling to achieve condensation of an enlarged class of species of polarisable particles.