Abstract
We propose a novel cooling scheme for realising single photon sideband cooling on particles trapped in a state-dependent optical potential. We develop a master rate equation from an ab-initio model and find that in experimentally feasible conditions it is possible to drastically reduce the average occupation number of the vibrational levels by applying a frequency sweep on the cooling laser that sequentially cools all the motional states. Notably, this cooling scheme works also when a particle experiences a deeper trap in its internal ground state than in its excited state, a condition for which conventional single photon sideband cooling does not work. In our analysis, we consider two cases: a two-level particle confined in an optical tweezer and Li atoms confined in an optical lattice, and find conditions for efficient cooling in both cases. The results from the model are confirmed by a full quantum Monte Carlo simulation of the system Hamiltonian. Our findings provide an alternative cooling scheme that can be applied in principle to any particle, e.g. atoms, molecules or ions, confined in a state-dependent optical potential.
Highlights
Optical potentials are widely used for confining and controlling particles such as atoms [1,2], molecules [3,4], and, more recently, ions [5,6]
Laser cooling of particles confined in optical potentials is challenging, since the trap depth is typically comparable to the Doppler temperature associated
We have presented a cooling scheme based on singlephoton sideband cooling of trapped particles in a nonharmonic optical potential with a state-dependent trap depth
Summary
Optical potentials are widely used for confining and controlling particles such as atoms [1,2], molecules [3,4], and, more recently, ions [5,6]. Sideband cooling is based on the selective laser excitation of motional quantum states of a trapped particle [10] This is possible when the energy separation between the motional levels is larger than the recoil energy associated with the cooling transition, a condition that is fulfilled in the so-called Lamb-Dicke regime. We propose a scheme for implementing single-photon sideband cooling in optical traps that surpasses current limitations by making it possible to cool particles in any optical potential, and in particular for αg > αe This scheme is based on sweeping the frequency of the cooling laser that ensures the cooling of all motional levels, leading to a final energy close to the potential ground state. IV, we investigate sideband cooling of Li atoms loaded in an optical lattice by addressing the D1 transition and by considering the whole multilevel structure of both electronic ground and excited states
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