RySQ

IARPA’s workshop on Multi-Qubit Coherent Operations, New-York City, 3–6 February 2015

Talk by Thierry Lahaye: "Quantum engineering in arrays of single Rydberg atoms".

QIPC Conference, Leeds, 14-18 September 2015

Talk by Rajiv Boddeda

ICQT 2015, Third International Conference on Quantum Technologies, Moscow, 13-17 July 2015

Talk by Philippe Grangier: "Quantum Optics and Quantum Communications with non-Gaussian States of Light".

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

Date: 
2015-12-28
Author(s): 

Rajiv Boddeda, Imam Usmani, Erwan Bimbard, Andrey Grankin, Alexei Ourjoumtsev, Etienne Brion, and Philippe Grangier

Reference: 

arXiv:1512.08480 [quant-ph], to appear in J. Phys. B special issue on Rydberg atoms

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 EIT (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.

Measurement of the angular dependence of the dipole-dipole interaction between two individual Rydberg atoms at a Förster resonance

Date: 
2015-08-25
Author(s): 

Sylvain Ravets, Henning Labuhn, Daniel Barredo, Thierry Lahaye, and Antoine Browaeys

Reference: 

Phys. Rev. A 92, 020701(R)

We measure the angular dependence of the resonant dipole-dipole interaction between two individual Rydberg atoms with controlled relative positions. By applying a combination of static electric and magnetic fields on the atoms, we demonstrate the possibility to isolate a single interaction channel at a Förster resonance, that shows a well-defined angular dependence.

Correlated Exciton Transport in Rydberg-Dressed-Atom Spin Chains

Date: 
2016-03-07
Author(s): 

H. Schempp, G. Günter, S. Wüster, M. Weidemüller and S. Whitlock

Reference: 

Phys. Rev. Lett. 115, 093002 (2015)

We investigate the transport of excitations through a chain of atoms with nonlocal dissipation introduced through coupling to additional short-lived states. The system is described by an effective spin-1/2 model where the ratio of the exchange interaction strength to the reservoir coupling strength determines the type of transport, including coherent exciton motion, incoherent hopping, and a regime in which an emergent length scale leads to a preferred hopping distance far beyond nearest neighbors.

Two-body interactions and decay of three-level Rydberg-dressed atoms

Date: 
2016-03-07
Author(s): 

S. Helmrich, A. Arias, N. Pehoviak and S. Whitlock

Reference: 

Journal of Physics B: Atomic, Molecular and Optical Physics 49, 03LT02 (2016)

We theoretically analyze the interactions and decay rates for atoms dressed by multiple laser fields to strongly interacting Rydberg states using a quantum master equation approach. In this framework a comparison of two-level and three-level Rydberg-dressing schemes is presented. We identify a resonant enhancement of the three-level dressed interaction strength which originates from cooperative multiphoton couplings as well as small distance dependent decay rates.

From the classical to the quantum Kibble-Zurek scaling

Date: 
2015-10-27
Author(s): 

P. Silvi, G. Morigi, T. Calarco, S. Montangero

Reference: 

arXiv:1510.07941

The Kibble-Zurek (KZ) hypothesis identifies the relevant time scales in out-of-equilibrium dynamics of critical systems employing concepts valid at equilibrium: It predicts the scaling of the defect formation immediately after quenches across classical and quantum phase transitions as a function of the quench speed. Here we study the crossover between the scaling dictated by a slow quench, which is ruled by the critical properties of the quantum phase transition, and the excitations due to a faster quench, where the dynamics is often well described by the classical model.

Optimal control of complex atomic quantum systems

Date: 
2015-11-06
Author(s): 

S. van Frank, M. Bonneau, J. Schmiedmayer, S. Hild, C. Gross, M. Cheneau, I. Bloch, T. Pichler, A. Negretti, T. Calarco, S. Montangero

Reference: 

arXiv:1511.02247

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