Quantum Technologies

Quantum Information Classification Scheme updated

Summary: 

Version 1.2 of the QICS is available.

The on-line version of the document can be browsed here.
A pdf of the full document will be generated following this link.
Old versions of the QICS are archived here.

QIPC cluster review meeting

Date: 
2012-04-18 - 2012-04-20
Place: 
NH Hotel Bingen, Museumstrasse 3, D-55411 Bingen (Mainz) Germany

This is the traditional QIPC cluster reviews. The program is as follows:

Q-ESSENCE highlights

The EU sponsored research initiative QESSENCE (Quantum Interfaces, Sensors, and Communication based on Entanglement) with a 3-year budget of €4.7 million to explore quantum entanglement, is in its final year. The research outcomes are expected to make significant impact on future disruptive technologies and provide enabling physics for larger scale quantum computers in the longer-term.

Just to name a few, the recent highlights of research within the consortium include:

Call For Conference Proposals published

Summary: 

A call for proposals for the next QUIE2T sponsored QIPC conference has been published.

A call for proposals for the next QUIE2T sponsored QIPC conference has been published.

Demonstration of UV-written waveguides, Bragg gratings and cavities at 780nm, and an original experimental measurement of group delay

Date: 
2011-11-22
Author(s): 

G. Lepert, M. Trupke, E.A. Hinds, H. Rogers, J.C. Gates, P.G.R. Smith

Reference: 

Optics Express, 19 (2011)
http://dx.doi.org/10.1364/OE.19.024933

We present direct UV-written waveguides and Bragg gratings operating at 780 nm. By combining two gratings into a Fabry-Perot cavity we have devised and implemented a novel and practical method of measuring the group delay of Bragg gratings.

Quantum Information Team, LTCI, Telecom ParisTech

Website: 
Research Type: 
Theory
Experiment

 - Quantum key distribution with continuous variables: theoretical and experimental work on long-distance system performance and side channel induced attacks

- Quantum cryptographic primitives: theoretical and experimental work on secret sharing, coin flipping, entanglement verification in the presence of adversaries

- Theory of Quantum Computation and Quantum Information including measurement-based quantum computing, entanglement theory and foundations of physics

Leader: 
Romain Alléaume, Eleni Diamanti, Damian Markham, Isabelle Zaquine

Electric-field sensing using single diamond spins

Date: 
2011-04-17
Author(s): 

F. Dolde, H. Fedder, M. Doherty, T. Nöbauer, F. Rempp, G. Balasubramanian, T. Wolf, F. Reinhard, L. Hollenberg, F. Jelezko, J. Wrachtrup

Reference: 

Nature Physics, 7 (2011), pp 459 - 463
doi:10.1038/nphys1969

The ability to sensitively detect individual charges under ambient conditions would benefit a wide range of applications across disciplines. However, most current techniques are limited to low-temperature methods such as single-electron transistors, single-electron electrostatic force microscopy and scanning tunnelling microscopy. Here we introduce a quantum-metrology technique demonstrating precision three-dimensional electric-field measurement using a single nitrogen-vacancy defect centre spin in diamond. An a.c.

Cavity QED with Magnetically Coupled Collecitve Spin States

Date: 
2011-08-03
Author(s): 

R. Amsüss, C. Koller, T. Nöbauer, S. Putz, S. Rotter, K. Sandner, S. Schneider, M. Schramböck, G. Steinhauser, H. Ritsch, H.-J. Schmiedmayer, J. Majer

Reference: 

Physical Review Letters, 107 (2011)
doi: 10.1103/PhysRevLett.107.060502

We report strong coupling between an ensemble of nitrogen-vacancy center electron spins in diamond and a superconducting microwave coplanar waveguide resonator. The characteristic scaling of the collective coupling strength with the square root of the number of emitters is observed directly. Additionally, we measure hyperfine coupling to 13C nuclear spins, which is a first step towards a nuclear ensemble quantum memory.

Quantum zigzag transition in ion chains

Date: 
2011-01-19
Author(s): 

E. Shimshoni, G. Morigi, S. Fishman

Reference: 

Phys. Rev. Lett 106, 010401 (2011)

A string of trapped ions at zero temperature exhibits a structural phase transition to a zigzag structure, tuned by reducing the transverse trap potential or the interparticle distance. The transition is driven by transverse, short wavelength vibrational modes. We argue that this is a quantum phase transition, which can be experimentally realized and probed.

Feedback Cooling of a Single Neutral Atom

Date: 
2010-10-21
Author(s): 

M. Koch, C. Sames, A. Kubanek, M. Apel, M. Balbach, A. Ourjoumtsev, P.W.H. Pinkse, G. Rempe

Reference: 

Physical Review Letters 105, 173003 (2010)
doi: 10.1103/PhysRevLett.105.173003

We demonstrate feedback cooling of the motion of a single rubidium atom trapped in a high-finesse optical resonator to a temperature of about 160  μK. Time-dependent transmission and intensity-correlation measurements prove the reduction of the atomic position uncertainty. The feedback increases the 1/e storage time into the 1 s regime, 30 times longer than without feedback.

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