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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 4 — Feb. 13, 2012
  • pp: 3711–3724

Combining red and blue-detuned optical potentials to form a Lamb-Dicke trap for a single neutral atom

Xiaodong He, Shi Yu, Peng Xu, Jin Wang, and Mingsheng Zhan  »View Author Affiliations

Optics Express, Vol. 20, Issue 4, pp. 3711-3724 (2012)

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We propose and demonstrate a scheme for strong radial confinement of a single 87Rb atom by a bichromatic far-off resonance optical dipole trap (BFORT). The BFORT is composed of a blue-detuned Laguerre-Gaussian L G 0 1 beam and a red-detuned Gaussian beam. The atomic oscillation frequency measurement shows that the effective trapping dimension is much sharper than that from a diffraction-limited microscopic objective. Theory shows that the added scattering rate due to imposing blue-detuned light is negligible when the temperature of the single atoms is close to ground state temperature. By carrying out sub-Doppler cooling, the mean energy of single atoms trapped in the BFORT is reduced to 15 ± 1 μK. The corresponding mean quantum number of radial vibration n is about 1.65, which satisfies the Lamb-Dicke regime. We conclude that the BFORT is a suitable Lamb-Dicke trap for further cooling a single neutral atom down to the ground state and for further application in quantum information processing.

© 2012 OSA

OCIS Codes
(020.7010) Atomic and molecular physics : Laser trapping
(090.2890) Holography : Holographic optical elements
(270.5585) Quantum optics : Quantum information and processing
(020.3320) Atomic and molecular physics : Laser cooling

ToC Category:
Atomic and Molecular Physics

Original Manuscript: December 5, 2011
Revised Manuscript: January 18, 2012
Manuscript Accepted: January 24, 2012
Published: January 31, 2012

Xiaodong He, Shi Yu, Peng Xu, Jin Wang, and Mingsheng Zhan, "Combining red and blue-detuned optical potentials to form a Lamb-Dicke trap for a single neutral atom," Opt. Express 20, 3711-3724 (2012)

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