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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
22nd Jun 2017

Characterizing the local vectorial electric field near an atom chip using Rydberg-state spectroscopy

We use the sensitive response to electric fields of Rydberg atoms to characterize all three vector components of the local electric field close to an atom-chip surface. We measured Stark-Zeeman maps of S and D Rydberg states using an elongated cloud of ultracold Rubidium atoms (T ~2.5 µK) trapped magnetically 100 µm from the chip surface. The spectroscopy of S states yields a calibration for the generated local electric field at the position of the atoms.
22nd Jun 2017

A medium-finesse optical cavity for the stabilization of Rydberg lasers

11th May 2017

Quantum theory of Kerr nonlinearity with Rydberg slow light polaritons

3rd May 2017

Contactless nonlinear optics mediated by long-range Rydberg interactions

In conventional nonlinear optics, linear quantum optics
3rd May 2017

Single-photon interference due to motion in an atomic collective excitation

Quantum-state engineering is of critical importance to the development of quantum technologies. One promising platform is thermal atomic vapours, because they offer long coherence times with reproducible and scalable hardware. However, the inability to address isolated atomic states in a controlled manner, due to multi-level degeneracy and motional broadening, is a major obstacle to their wider application.
3rd May 2017

ARC: An open-source library for calculating properties of alkali Rydberg atoms

We present an object-oriented Python library for computation of properties of highly-excited Rydberg states of alkali atoms.
3rd May 2017

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

We investigate the nonequilibrium 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.
3rd May 2017

Probing interactions of thermal Sr Rydberg atoms using simultaneous optical and ion detection

We demonstrate a method for probing interaction effects in a thermal beam of strontium atoms using simultaneous measurements of Rydberg EIT and spontaneously created ions or electrons. We present a Doppler-averaged optical Bloch equation model that reproduces the optical signals and allows us to connect the optical coherences and the populations.
2nd May 2017

Optical techniques for Rydberg physics in lattice geometries

We address the technical challenges when performing quantum information experiments with ultracold Rydberg atoms in lattice geometries. We discuss the following key aspects: (i) the coherent manipulation of atomic ground states, (ii) the coherent excitation of Rydberg states, and (iii) spatial addressing of individual lattice sites.
2nd May 2017

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 a 1D geometry offers several advantages over a three-dimensional geometry 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.
28th Apr 2017

A sensitive electrometer based on a Rydberg atom in a Schrödinger-cat state

Fundamental quantum fluctuations caused by the Heisenberg principle limit measurement precision.
24th Apr 2017

Rydberg-induced optical nonlinearities from a cold atomic ensemble trapped inside a cavity

We experimentally characterize the optical nonlinear response of a cold atomic medium placed inside an optical cavity, and excited to Rydberg states. The excitation to S and D Rydberg levels is carried out via a two-photon transition in an electromagnetically induced transparency configuration, with a weak (red) probe beam on the lower transition, and a strong (blue) coupling beam on the upper transition. The observed optical nonlinearities induced by S states for the probe beam can be explained using a semi-classical model with van der Waals' interactions.
24th Apr 2017

Inelastic Photon Scattering via the Intracavity Rydberg Blockade

Electromagnetically induced transparency (EIT) in a ladder system involving a Rydberg level is known to yield giant optical nonlinearities for the probe field, even in the few-photon regime. This enhancement is due to the strong dipole-dipole interactions between Rydberg atoms and the resulting excitation blockade phenomenon. In order to study such highly correlated media, ad hoc models or low-excitation assumptions are generally used to tackle their dynamical response to optical fields.
24th Apr 2017

Nonlinear optical susceptibility of EIT systems with a degenerate Rydberg level

It has been demonstrated that very large optical nonlinearities can arise in cold Rydberg gases from strong Rydberg–Rydberg interactions. The interactions between atoms excited to a degenerate Rydberg level are described by a large number of molecular potentials which greatly complicates the theoretical treatment of these systems. We here present a method for very accurate calculation of the third order interaction-induced optical nonlinearities that fully includes the angle-dependent mixing of molecular states by the control optical field.
24th Apr 2017

Quantum-optical nonlinearities induced by Rydberg-Rydberg interactions: A perturbative approach

In this article, we theoretically study the quantum statistical properties of the light transmitted through or reflected from an optical cavity, filled by an atomic medium with strong optical nonlinearity induced by Rydberg-Rydberg van der Waals interactions. Atoms are driven on a two-photon transition from their ground state to a Rydberg level via an intermediate state by the combination of a weak signal field and a strong control beam.

 

 

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