Echo experiments in a strongly interacting Rydberg gas |
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Authors: | Raitzsch Ulrich Bendkowsky Vera Heidemann Rolf Butscher Björn Löw Robert Pfau Tilman |
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Institution: | 5. Physikalisches Institut, Universit?t Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany. u.raitzsch@physik.uni-stuttgart.de |
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Abstract: | When ground state atoms are excited to a Rydberg state, van der Waals interactions among them can lead to a strong suppression of the excitation. Despite the strong interactions the evolution can still be reversed by a simple phase shift in the excitation laser field. We experimentally prove the coherence of the excitation in the strong blockade regime by applying an "optical rotary echo" technique to a sample of magnetically trapped ultracold atoms, analogous to a method known from nuclear magnetic resonance. We additionally measured the dephasing time due to the interaction between the Rydberg atoms. |
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