EGAS41 - Swansea University
EGAS41 - Swansea University
EGAS41 - Swansea University
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41 st EGAS CP 120 Gdańsk 2009<br />
Dipole-dipole interaction of several cold Rb Rydberg atoms<br />
I.I. Beterov 1,∗ , D.B. Tretyakov 1 , V.M. Entin 1 , I.I. Ryabtsev 1 , P.L. Chapovsky 2<br />
1 Institute of Semiconductor Physics SB RAS, Novosibirsk,Russia<br />
2 Institute of Automation and Electrometry SB RAS, Novosibirsk, Russia<br />
∗ Corresponding author: beterov@isp.nsc.ru<br />
Transition probability [rel.un.]<br />
0.10<br />
S5<br />
0.08<br />
0.06<br />
0.04<br />
0.10 1.6 1.7 1.8 1.9 2.0 2.1 2.2<br />
0.08<br />
0.06<br />
0.04<br />
0.101.6 1.7 1.8 1.9 2.0 2.1 2.2<br />
0.08<br />
0.06<br />
0.04<br />
0.101.6 1.7 1.8 1.9 2.0 2.1 2.2<br />
0.08<br />
0.06<br />
0.04<br />
0.101.6 1.7 1.8 1.9 2.0 2.1 2.2<br />
0.08<br />
S4<br />
S3<br />
S2<br />
S1<br />
0.06<br />
0.04<br />
1.6 1.7 1.8 1.9 2.0 2.1 2.2<br />
Electric field [V/cm]<br />
Long-range interactions of Rydberg<br />
atoms can be used to implement quantum<br />
logic gates of a quantum computer<br />
based on neutral atoms. We studied the<br />
dipole-dipole interaction of a small definite<br />
number of cold rubidium Rydberg atoms<br />
trapped in a MOT [1].<br />
The initial 37P Rydberg state was excited<br />
by two pulsed lasers in a crossedbeam<br />
geometry. The laser beams were focused<br />
inside of the cold atom cloud and intersected<br />
at right angles, providing a small<br />
excitation volume of 30 µm in size. Each<br />
laser pulse excited several Rydberg atoms,<br />
which were detected using the selective<br />
field ionization technique and a channeltron,<br />
which provided a single-atom resolution<br />
of up to 5 atoms.<br />
We observed the Förster resonance<br />
transitions driven by dipole-dipole interaction:<br />
Figure 1: Spectra of the resonant dipole-dipole<br />
interaction.<br />
Rb(37P)+Rb(37P) → Rb(37S)+Rb(38S)<br />
Exact resonance for this energy-exchange process was achieved by Stark tuning of the<br />
Rydberg energy levels. The atomic signals were sorted over the number of detected<br />
atoms. The spectra of the resonant dipole-dipole interaction for selectively detected 1 to<br />
5 Rydberg atoms are shown in Fig. 1. The red lines indicate the calculated positions of the<br />
resonances. The dependences of the peak heights and widths on the number of Rydberg<br />
atoms are analyzed and compared with theory using a many-particle Monte-Carlo model<br />
for definite number of Rydberg atoms randomly positioned in the excitation volume.<br />
Acknowledgment<br />
This work was supported by the Russian Academy of Science and Russian Foundation for Basic<br />
Research.<br />
References<br />
[1] D.B. Tretyakov, I.I. Beterov, V.M. Entin, I.I. Ryabtsev, P.L. Chapovsky, JETP 108<br />
374, (2009); http://arxiv.org/abs/0810.5427<br />
180
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