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RySQ : Results

Results of the project.

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Format: 2024-07-16
Format: 2024-07-16
Format: 2024-07-16
26th Jul 2016

Difference-frequency combs in cold atom physics
Optical frequency combs provide the clockwork to relate optical frequencies
to radio frequencies. Hence, combs allow to measure optical frequencies
with respect to a radio frequency where the accuracy is limited
only by the reference signal. In order to provide a stable link between the
radio and optical frequencies, the two parameters of the frequency comb
must be fixed: the carrier envelope offset frequency fceo and the pulse
6th Jul 2016

Rydberg dressing of a one-dimensional Bose-Einstein condensate

We study the influence of Rydberg dressed interactions in a one-dimensional (1D) Bose-Einstein Condensate (BEC). We show that 1D is advantageous over 3D for observing BEC Rydberg dressing. The effects of dressing are studied by investigating collective BEC dynamics after a rapid switch-off of the Rydberg dressing interaction. The results can be interpreted as an effective modification of the $s$-wave scattering length.
6th Jul 2016

Raman transitions between hyperfine clock states in a magnetic trap

We present our experimental investigation of an optical Raman transition between the magnetic clock states of $^87$Rb in an atom chip magnetic trap. The transfer of atomic population is induced by a pair of diode lasers which couple the two clock states off-resonantly to an intermediate state manifold.
6th Jul 2016

Electromagnetically induced transparency with Rydberg atoms across the Breit-Rabi regime

We present experimental results on the influence of magnetic fields and laser polarization on electromagnetically induced transparency (EIT) using Rydberg levels of $^87$Rb atoms. The measurements are performed in a room temperature vapor cell with two counter-propagating laser beams at 480nm and 780nm in a ladder-type energy level scheme.
18th Mar 2016

Driven-dissipative many-body systems with mixed power-law interactions: Bistabilities and temperature-driven non-equilibrium phase transitions

We investigate the non-equilibrium dynamics of a driven-dissipative spin ensemble with competing power-law interactions. We demonstrate that dynamical phase transitions as well as bistabilities can emerge for asymptotic van der Waals interactions, but critically rely on the presence of a slower decaying potential-core.
18th Mar 2016

Nonlinear quantum optics mediated by Rydberg interactions

By mapping the strong interaction between Rydberg excitations in ultra-cold atomic ensembles onto single photons via electromagnetically induced transparency it is now possible to realize a nonlinear optical medium which can modify light on the level of individual photons.
11th Mar 2016

Non-equilibrium fluctuations and metastability in the dynamics of dissipative multi-component Rydberg gases

11th Mar 2016

Emergent kinetic constraints in open quantum systems

11th Mar 2016

On the non-equilibrium dynamics of dissipative Rydberg gases in the presence of dephasing noise

11th Mar 2016

Absorbing state phase transition with competing quantum and classical fluctuations

11th Mar 2016

Enhancement of Rydberg-mediated single-photon nonlinearities by electrically tuned Förster Resonances

11th Mar 2016

Experimental observation of controllable kinetic constraints in a cold atomic gas

11th Mar 2016

Coherence in a cold atom photon switch

11th Mar 2016

Dynamic Nuclear Polarization as Kinetically Constrained Diffusion

11th Mar 2016

Strongly correlated growth of Rydberg aggregates in a vapor cell

 

 

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