Quantum Computation

"Quantum simulators" revealed in fresh detail


Researchers locate individual particles in an optical lattice

Physicists in Germany have used fluorescence imaging to identify individual particles in an optical lattice for the first time. The breakthrough could allow researchers to create more advanced simulations of quantum phenomena and it might help in the quest for practical quantum computing.

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Call for FET-Flagship Pilots


Announcing the call for FET Flagship Pilots in the Commission ICT Work-Programme 2011-2012

In the new Commission ICT Work Programme 2011-2012 there is a new call (with deadline December the 2nd 2010) for Coordination and Support Actions designed to identify FET-Flagship Candidate (if you don't know what a FET-Flagship is a good place to start from is here).

International cooperation on FET research


Announcing FET-Open Objective ICT-2011.9.4: International cooperation on FET research

The Commission ICT Work-Programme 2011-2012 feature an interesting Objective under FET-Open, namely "Objective ICT-2011.9.4: International cooperation on FET research". This consist in a funding scheme that provides additional funding to existing grant for on-going FET IPs and STREPs ending at least 18 months after the submission date of the proposal (click on the tab below to access the full Objective text as published in the WP).

QIPC in the ICT Work-Programme 2011-2013


The new ICT Work Programme 2011-2012 has been published, featuring QIPC as a FET Proactive Objective.

The new ICT Work Programme 2011-2012 has been published on the CORDIS website (a copy for download is available also here), and QIPC is contemplated again amongst the FET Proactive Initiatives. 

The WP features the objective ICT-2011 9.9 "Quantum ICT including ERA-NET Plus" (click on the tab below to read the full text)

P is not equal to NP?


HP Labs' researcher Vinay Deolalikar claims to have solved the problem. His answer is that the two classes do not coincide: P is a proper subset of NP.

On August 6 HP Labs' researcher Vinay Deolalikar sent the following letter to his fellows researchers in HP Labs:

"Dear Fellow Researchers,
I am pleased to announce a proof that P is not equal to NP, which is attached in 10pt and 12pt fonts

The proof required the piecing together of principles from multiple areas within mathematics. The major effort in constructing this proof was uncovering a chain of conceptual links between various fields and viewing them through a common lens. Second to this were the technical hurdles faced at each stage in the proof.

This work builds upon fundamental contributions many esteemed researchers have made to their fields. In the presentation of this paper, it was my intention to provide the reader with an understanding of the global framework for this proof. Technical and computational details within chapters were minimized as much as possible.

Correcting errors in a quantum gate with pushed ions via optimal control


U. V. Poulsen, S. Sklarz, D. Tannor, T. Calarco


Phys. Rev. A 82, 012339 (2010).

We analyze in detail the so-called pushing gate for trapped ions, introducing a time-dependent harmonic approximation for the external motion. We show how to extract the average fidelity for the gate from the resulting semiclassical simulations. We characterize and quantify precisely all types of errors coming from the quantum dynamics and reveal that slight nonlinearities in the ion-pushing force can have a dramatic effect on the adiabaticity of gate operation.

QOLS - Quantum Optics and Laser Science

Research Type: 
  • Quantum Optics and Quantum Information
  • Novel Laser Phenomena And Non Linear Atom And Photon Optics
  • Cold Matter Non-Linear Optics In A Coherently Prepared Molecular Medium
  • Ion Traps and Laser Cooling
  • Confined Atoms And Atoms In External Fields
  • Strong Field Theory
  • Laser Development And Modelling
  • Shaping Of High Intensity Laser Pulses
  • Molecules In Strong Fields
  • High Intensity Laser Interactions With Nanoparticles
Edward A. Hinds

Entangling photons with electricity


'Entangled' LED could help make quantum computer

Researchers in Cambridge in the UK have succeeded in generating entangled photons using electricity alone, with a new device called an "entangled light-emitted diode" (ELED). The device converts electrical current directly into entangled light rather than relying on laser power as in previous technology. The technique could be a practical way to integrate many entangled light sources together on a single chip – something that will be crucial for making a real-world optical quantum computer.

Atom chip for BEC interferometry


A. E. Hinds et al.
J. Phys. B: At. Mol. Opt. Phys. 43 (2010) 051003

We have fabricated and tested an atom chip that operates as a matter wave interferometer. In this communication we describe the fabrication of the chip by ion-beam milling of gold evaporated onto a silicon substrate. We present data on the quality of the wires, on the current density that can be reached in the wires and on the smoothness of the magnetic traps that are formed. We demonstrate the operation of the interferometer, showing that we can coherently split and recombine a Bose–Einstein condensate with good phase stability.

A single atom detector integrated on an atom chip: fabrication, characterization and application


D. Heine, W. Rohringer, D. Fischer, M. Wilzbach, T. Raub, S. Loziczky, XiYuan Liu, S. Groth, B. Hessmo, J. Schmiedmayer
New J. Phys., 12, 095005 (2010)

We describe a robust and reliable fluorescence detector for single atoms
that is fully integrated into an atom chip. The detector allows spectrally and
spatially selective detection of atoms, reaching a single atom detection efficiency
of 66 %. It consists of a tapered lensed single-mode fiber for precise delivery of
excitation light and a multi-mode fiber to collect the fluorescence. The fibers are
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