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arXiv:1003.4443 · Journal of Physics B Atomic Molecular and Optical Physics

Atom-number filter in an optical lattice

Georgios M. Nikolopoulos, David Petrosyan

Published Jun 17, 2010• 7 citations
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Abstract

We present an efficient procedure to filter out from an optical lattice, having an inhomogeneous site occupation number, only a preselected number of bosonic atoms per site and place them into another internal atomic state, thereby creating a lattice with a desired site occupation number.
DOI
10.1088/0953-4075/43/13/131001

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We present a simple and efficient scheme to reduce atom-number fluctuations in optical lattices. The interaction-energy difference for atoms in different vibrational states is used to remove excess atomic occupation. The remaining vacant sites are then filled with atoms by merging adjacent wells, for which we implement a protocol that circumvents the constraints of unitarity. The preparation of large regions with precisely one atom per lattice site is discussed for both bosons and fermions. The resulting low-entropy Mott-insulating states may serve as high-fidelity register states for quantum computing and as a starting point for investigations of many-body physics.
We propose and analyse several schemes for cooling bosonic and fermionic atoms in an optical lattice potential close to the ground state of the no-tunnelling regime. Some of the protocols rely on the concept of algorithmic cooling, which combines occupation number filtering with ideas from ensemble quantum computation. We also design algorithms that create an ensemble of defect-free quantum registers. We study the efficiency of our protocols for realistic temperatures and in the presence of a harmonic confinement. We also propose an incoherent physical implementation of filtering which can be operated in a continuous way.