## From Rotating Atomic Rings to Quantum Hall States

Date:
2011-07-25
Author(s):

M. Roncaglia, M. Rizzi, J. Dalibard

Reference:

M. Roncaglia, M. Rizzi & J. Dalibard
From rotating atomic rings to quantum Hall states
Scientific Reports 1, 43 (2011)

Considerable efforts are currently devoted to the preparation of ultracold neutral atoms in the strongly correlated quantum Hall regime. However, the necessary angular momentum is very large and in experiments with rotating traps this means spinning frequencies extremely near to the deconfinement limit; consequently, the required control on parameters turns out to be too stringent. Here we propose instead to follow a dynamic path starting from the gas initially confined in a rotating ring.

## Quantum Walks with Non-Abelian Anyons

Date:
2011-06-17
Author(s):

L. Lehman, V. Zatloukal, G.K. Brennen, J.K. Pachos, and Z. Wang

Reference:

Phys. Rev. Lett. 106, 230404 (2011).

We study the single particle dynamics of a mobile non-Abelian anyon hopping around many pinned anyons on a surface, by modeling it with a discrete time quantum walk. During the evolution, the spatial degree of freedom of the mobile anyon becomes entangled with the fusion degrees of freedom of the collective system. Each quantum trajectory makes a closed braid on the world lines of the particles establishing a direct connection between statistical dynamics and quantum link invariants.

## International Workshop on Nanowire Superconducting Single-Photon Detectors

Summary:

Eindhoven University of Technology, a partner in Q-ESSENCE consortium, organizes the International Workshop on Nanowire Superconducting Single-Photon Detectors.

This one-day workshop on the physics, technology and application of single-photon detectors based on superconducting nanowires will take place on Friday September 23, 2011, in Eindhoven, The Netherlands. It will be a satellite workshop of the EUCAS 2011 - Superconductivity Centennial Conference (The Hague, September 18-23).

## A new product by ID Quantique awarded with CLEO Innovation Award

Summary:
ID Quantique is developing a new single photon detection module called id210, already awarded with CLEO/Laser Focus World Innovation Award 2011 Honorable Mention.

ID Quantique, a partner in the Q-ESSENCE consortium, is developing a new product – new single photon detection module called id210. The development of this module is possible partly due to Q-ESSENCE support. The first version of id210 was already presented at CLEO - Laser Focus World, and Laser - World of Photonics, winning the CLEO/Laser Focus World Innovation Award 2011 Honorable Mention.
The id210 brings a major breakthrough for single photon detection at telecom wavelengths. Its

## 1st International Conference on Quantum Technologies

Date:
2011-07-13 - 2011-07-17
Place:
Moscow
Website:

The 1st International Conference on Quantum Technologies will take place in Moscow on July 13-17, 2011. It is planned as a kick-off meeting of the fresh born Russian Quantum Center. This interdisciplinary meeting will bring together about 60-80 experts from various fields of physics exploring frontiers of quantum technologies and will include sessions on

• mesoscopic physics,
• quantum optics,
• ultra-cold atoms and molecules,
• quantum information,
• quantum communication.

## Workshop on "Entanglement in Solid State Systems"

Summary:

Workshop on "Entanglement in Solid State Systems" will be held on Sept. 20-22 2011 in Lecce, Italy.

http://www.wesss.nano.cnr.it/

The aim of this workshop is to bring together experts in different fields to compare experiences, approaches and strategies to control entanglement in different solid state quantum systems, such as nuclear & electronic spins, quantum dots & wires, superconducting & hybrid structures, impurities in solids, polaritons, etc. More specifically,
topics involved are:
-control, generation, robustness and transfer of entanglement;
-measurement of entanglement.

## Spin Self-Rephasing and Very Long Coherence Times in a Trapped Atomic Ensemble

Date:
2010-07-06
Author(s):

C. Deutsch, F. Ramirez-Martinez, C. Lacroûte, F. Reinhard, T. Schneider, J.N. Fuchs, F. Piéchon, F. Laloë, J. Reichel, P. Rosenbush

Reference:

Phys. Rev. Lett. 105 020401 (2010)

## Single-Spin Addressing in an Atomic Mott Insulator

Date:
2011-03-17
Author(s):

C. Weitenberg et al.

Reference:

Nature 471, 319 (2011)

Ultracold atoms in optical lattices provide a versatile tool with which to investigate fundamental properties of quantum many-body systems. In particular, the high degree of control of experimental parameters has allowed the study of many interesting phenomena, such as quantum phase transitions and quantum spin dynamics. Here we demonstrate how such control can be implemented at the most fundamental level of a single spin at a specific site of an optical lattice.

## Ground-state-cooling vibrations of suspended carbon nanotubes with constant electron current

Date:
2010-05-07
Author(s):

S. Zippilli, A. Bachtold, G. Morigi

Reference:

Phys. Rev. B 82 205408 (2010)

## The excitation of a two level atom with a propagating light pulse

Date:
2010-10-22
Author(s):

Y. Wang, L. Sheridan, V. Scarani

Reference:

arXiv:1010.4661v1

State mapping between atoms and photons, and photon-photon interactions play an important role in scalable quantum information processing. We consider the interaction of a two-level atom with a quantized \textit{propagating} pulse in free space and study the probability $P_e(t)$ of finding the atom in the excited state at any time $t$. This probability is expected to depend on (i) the quantum state of the pulse field and (ii) the overlap between the pulse and the dipole pattern of the atomic spontaneous emission.