Hannover 2010 – wissenschaftliches Programm
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SYSA: Symposium Single Atoms
SYSA 1: Single Atoms I
SYSA 1.3: Hauptvortrag
Donnerstag, 11. März 2010, 11:30–12:00, A 320
Substantial interaction between a singe atom and a focused light beam — •Gleb Maslennikov1, Syed Abdullah Aljunid1, Brenda Chng1, Florian Huber2, Meng Khoon Tey3, Timothy Liew4, Valerio Scarani1, and Christian Kurtsiefer1 — 1Centre for Quantum Technologies / Physics Dept., Nat. Univ. Singapore — 2Harvard University — 3IQOQI Innsbruck — 4EPFL Neuchatel
We investigate both theoretically and experimentally the near-resonant interaction between a single atom in an optical dipole trap and a focused coherent light beam. We have demonstrated that even for a moderate focusing strength, a single atom localized at the focus of a simple aspheric lens can scatter a significant fraction of light [1,2], impose a phase shift [3], and partially reflect a probe beam. With our current experimental system, we observe an extinction of 10%, a phase shift of about 1∘ and a reflectivity of 0.17%. For an optimal focusing geometry, we expect an extinction up to 92% and a phase shift of 30∘.
The strength of the observed effect suggests that an fficient interface between atoms and photons for quantum information purposes can be established – either without cavities, or by enhancing the electrical field in in a low-finesse cavity simply by strong focusing. We report on our experimental progress towards this goal.
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[1] M. K. Tey, et al., Nature Physics 4, 924 (2008)
[2] M. K. Tey et. al., New J. Phys. 11, 043011 (2009)
[3] S.A. Aljunid et al., Phys. Rev. Lett. 103, 153601 (2009)