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Echo experiments in a strongly interacting Rydberg gas.

Ulrich Raitzsch1, Vera Bendkowsky, Rolf Heidemann

  • 15. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany. u.raitzsch@physik.uni-stuttgart.de

Physical Review Letters
|February 1, 2008
PubMed
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Ultracold atoms excited to Rydberg states experience strong interactions that suppress excitation. An optical rotary echo technique proved this excitation coherence is reversible, even in the strong blockade regime.

Area of Science:

  • Atomic physics
  • Quantum optics
  • Ultracold atoms

Background:

  • Exciting ground state atoms to Rydberg states leads to strong van der Waals interactions.
  • These interactions can cause significant suppression of excitation, a phenomenon known as Rydberg blockade.

Purpose of the Study:

  • To experimentally demonstrate the coherence of excitation in the strong Rydberg blockade regime.
  • To investigate the reversibility of excitation dynamics despite strong interatomic interactions.

Main Methods:

  • Utilizing magnetically trapped ultracold atoms.
  • Applying an "optical rotary echo" technique, analogous to nuclear magnetic resonance methods.
  • Measuring the dephasing time influenced by Rydberg atom interactions.

Related Experiment Videos

Main Results:

  • Experimental proof of excitation coherence in the strong blockade regime.
  • Demonstration that excitation evolution is reversible via a phase shift in the laser field.
  • Quantification of dephasing time due to Rydberg atom interactions.

Conclusions:

  • The coherence of Rydberg excitation is robust and reversible, even under strong blockade conditions.
  • The optical rotary echo technique is effective for probing coherence in ultracold atomic systems.
  • Understanding dephasing times is crucial for controlling Rydberg interactions.