Quantum Computation

AQUTE Flagchip box

This highlight contains a small video and the accompanying poster displaying what is know as the AQUTE Flagchip, the wondrous box containing the state-of-the-art atomic chips that has been displayed in several ICT events (the last one having been ICT 2010 Digitally Driven in Brussels). Enjoy!

Intel Labs Europe, ExaScience – High Performance Computing – imec

Imec performs world-leading research in nano-electronics and nano-technology. Its staff of more than 1,750 people includes over 550 industrial residents and guest researchers. Imec’s research is applied in better healthcare, smart electronics, sustainable energy, and safer transport.

Frontiers in Quantum Information, Computing & Communication (QICC)-2011 Meeting

Date: 
2011-09-26 - 2011-09-27
Place: 
In Between Massachusetts Institute of Technology & Harvard University Campuses on 777 Memorial Drive at Courtyard Marriott, Cambridge, Massachusetts 02139 USA

Quantum Chemistry, Single Quantum Dot Tracking, Semiconductor Nanocrystals, Caron Nanotubes for the study of DNA, Light-driven Molecular Machines, Energy Transfer Pr

Quantum Science Symposium-2011

Date: 
2011-09-26 - 2011-09-27
Place: 
In Between Massachusetts Institute of Technology & Harvard University Campuses on 777 Memorial Drive at Courtyard Marriott, Cambridge, Massachusetts 02139 USA

 QICC-Key Sessions:

Entanglement of two individual atoms using the Rydberg blockade

Date: 
2010-06-07 - 2010-06-12
Author(s): 

A. Browaeys, A. Gaetan, T. Wilk, C. Evellin, J. Wolters, Y. Miroshnychenko, P. Grangier, P. Pillet, D. Comparat, A. Chotia, and M. Viteau

Reference: 

19th International Conference on Laser Spectroscopy, Kussharo, JAPAN, JUN 07-12, 2009, in:Laser Spectroscopy, 63-73 (2010)

We report on our recent progress on the manipulation of single rubidium atoms trapped in optical tweezers and the generation of entanglement between two atoms, each individually trapped in neighboring tweezers. To create an entangled state of two atoms in their ground states, we make use of the Rydberg blockade mechanism. The degree of entanglement is measured using global rotations of the internal states of both atoms. Such internal state rotations on a single atom are demonstrated with a high fidelity.

Analysis of the entanglement between two individual atoms using global Raman rotations

Date: 
2010-06-28
Author(s): 

A. Gaetan, C. Evellin, J. Wolters, P. Grangier, T. Wilk, and A. Browaeys

Reference: 

New Journal of Physics, 12, 12 (2010)

Making use of the Rydberg blockade, we generate entanglement between two atoms individually trapped in two optical tweezers. In this paper we detail the analysis of the data and show that we can determine the amount of entanglement between the atoms in the presence of atom losses during the entangling sequence. Our model takes into account states outside the qubit basis and allows us to perform a partial reconstruction of the density matrix describing the two atom state.

Phase space tweezers for tailoring cavity fields by quantum Zeno dynamics

Date: 
2010-11-16
Reference: 

J.M. Raimond, C. Sayrin, S. Gleyzes, I. Dotsenko, M. Brune, S. Haroche, P. Facchi, S. Pascazio
Phys. Rev. Lett. 105, 213601 (2010)

Topological matter with collective encoding and Rydberg blockade

Date: 
2010-11-23
Author(s): 

Anne E. B. Nielsen, K. Mølmer

Reference: 

Phys Rev A 82, 052326 (2010)
http://arxiv.org/abs/1006.5664

We propose to use a permutation symmetric sample of multi-level atoms to simulate the properties of topologically ordered states. The Rydberg blockade interaction is used to prepare states of the sample which are equivalent to resonating valence bond states, Laughlin states, and string-net condensates and to create and study the properties of their quasi-particle-like fundamental excitations.

Speeding up critical system dynamics through optimized evolution

Date: 
2011-07-12
Author(s): 

T. Caneva, T. Calarco, R. Fazio, G. E. Santoro, S. Montangero

Reference: 

Phys. Rev. A 84, 012312 (2011)

The number of defects which are generated upon crossing a quantum phase transition can be minimized by choosing properly designed time-dependent pulses. In this work we determine what are the ultimate limits of this optimization. We discuss under which conditions the production of defects across the phase transition is vanishing small.

Fast and robust quantum computation with ionic Wigner crystals

Date: 
2011-04-15
Author(s): 

J. D. Baltrusch, A. Negretti, J. M. Taylor, T. Calarco

Reference: 

Phys. Rev. A 83, 042319 (2011).

We present a detailed analysis of the modulated-carrier quantum phase gate implemented with Wigner crystals of ions confined in Penning traps. We elaborate on a recent scheme, proposed by two of the authors, to engineer two-body interactions between ions in such crystals. We analyze for the first time the situation in which the cyclotron (w_c) and the crystal rotation (w_r) frequencies do not fulfill the condition w_c=2w_r.

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