Hamburg 2009 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 42: Quanteninformation: Atome und Ionen II
Q 42.2: Vortrag
Donnerstag, 5. März 2009, 10:45–11:00, Audi-B
Sub microsecond, highly efficient ionisation detection of single 87Rb atoms — •Florian Henkel1, Michael Krug1, Norbert Ortegel1, Julian Hofmann1, Wenjamin Rosenfeld1, Markus Weber1, and Harald Weinfurter1,2 — 1Department für Physik der LMU, Schellingstrasse 4/III, 80799 München — 2Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching
Fast and efficient state detection of qubits stored in single atoms represents an integral part regarding future implementations of quantum computation with neutral atoms [1].
In order to realise such a readout, single neutral 87Rb atoms are ionised out of the background gas in a two-photon process (λ1=780 nm, λ2=473 nm). The charged ionisation fragments (e− and 87Rb+) are accelerated into two channel electron multipliers. Observing both fragments we are able to detect single 87Rb atoms with an absolute efficiency of ∼93.7 % within 460 ns after ionisation being considerably faster than conventional fluorecence detection schemes.
This technique is a promising approach as an atomic readout unit for a final, loophole-free test of Bells inequality [2]. In principle, this detection should also be applicable to atomic arrays [3] or atoms in optical lattices [4].
[1] D. P. DiVincenzo, Fortschritte der Physik 48, 771-784 (2000)
[2] J. Volz et al., Phys. Rev. Lett. 96, (2006)
[3] Y. Miroshnychenko et al., Nature 442, 151 (2006)
[4] I. Bloch, Nature 453, 1016-1022 (2008)