Coherence and Raman sideband cooling of a single atom in an optical tweezer

Abstract

We investigate quantum control of a single atom in an optical tweezer trap created by a tightly focused optical beam. We show that longitudinal polarization components in the dipole trap arising from the breakdown of the paraxial approximation give rise to significant internal-state decoherence. We show that this effect can be mitigated by appropriate choice of magnetic bias field, enabling Raman sideband cooling of a single atom close to its three-dimensional ground state in an optical trap with a beam waist as small as $w=900$ nm. We achieve vibrational occupation numbers of ${\bar{n}}_r=0.01$ and ${\bar{n}}_a=8$ in the radial and axial directions of the trap, corresponding to an rms size of the atomic wavepacket of 24 nm and 270 nm, respectively. This represents a promising starting point for future hybrid quantum systems where atoms are placed in close proximity to surfaces.

5 pages, 4 figures

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• Cooling a single atom in an optical tweezer to its quantum ground state
• Energy distribution and cooling of a single atom in an optical tweezer
• Analysis of dephasing mechanisms in a standing wave dipole trap
• Fabrication and heating rate study of microscopic surface electrode ion traps
• Fast Quantum State Control of a Single Trapped Neutral Atom
• Interfacing light and single atoms with a lens
• Long-distance atom-photon entanglement
• 3D Projection Sideband Cooling

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