Suppression of single cesium atom heating in a microscopic optical dipole trap for demonstration of an 852nm triggered single-photon source

Abstract

We investigate single cesium (Cs) atom heating owing to the momentum accumulation process induced by the resonant pulsed excitation in a microscopic optical dipole trap formed by a strongly focused 1064 nm laser beam. The heating depends on the trap frequency which restricts the maximum repetition rate of pulsed excitation. We experimentally verify the heating of a single atom and then demonstrate how to suppress it with an optimized pulsed excitation/cooling method. The typical trap lifetime of single Cs atom is extended from 108 +/- 6 us to 2536 +/- 31 ms, and the corresponding number of excitation increases from ~ 108 to ~ 360000. In applying this faster cooling method, we use the trapped single Cs atom as a triggered single-photon source at an excitation repetition rate of 10 MHz. The second-order intensity correlations of the emitted single photons are characterized by implementing Hanbury Brown and Twiss setup, and clear anti-bunching effect has been observed.

10 pages, 7 figures

References in corpus (6)

• Quantum State Engineering and Precision Metrology using State-Insensitive Light Traps
• 'Designer atoms' for quantum metrology
• Energy distribution and cooling of a single atom in an optical tweezer
• Fast Quantum State Control of a Single Trapped Neutral Atom
• Achieving very long lifetimes in optical lattices with pulsed cooling
• Hong-Ou-Mandel interference between triggered and heralded single photons from separate atomic systems

Cited by in corpus (3)

• Measurement of magic-wavelength optical dipole trap by using the laser-induced fluorescence spectra of trapped single cesium atoms
• Two-way single-photon-level frequency conversion between 852nm and 1560nm for connecting cesium D2 line with the telecom C-band
• Amplification of nanosecond laser pulse chain via dynamic injection locking of laser diode