Ground state cooling of atoms in optical lattices

TL;DR

This paper introduces two innovative schemes for ground state cooling of atoms in optical lattices, utilizing quantum algorithms and tunneling, without needing single-site addressing, and analyzes their efficiency via entropy reduction.

Contribution

It presents novel, fast filtering-based cooling protocols for bosonic and fermionic atoms in optical lattices, expanding the toolkit for quantum state preparation.

Findings

Both schemes effectively reduce entropy in optical lattices.

The methods do not require single-site addressing.

Theoretical analysis confirms high cooling efficiency.

Abstract

We propose two schemes for cooling bosonic and fermionic atoms that are trapped in a deep optical lattice. The first scheme is a quantum algorithm based on particle number filtering and state dependent lattice shifts. The second protocol alternates filtering with a redistribution of particles by means of quantum tunnelling. We provide a complete theoretical analysis of both schemes and characterize the cooling efficiency in terms of the entropy. Our schemes do not require addressing of single lattice sites and use a novel method, which is based on coherent laser control, to perform very fast filtering.