QUROPE Quantum Information Processing and Communication in Europe

The reliable detection of single quantum particles has revolutionized the field of quantum optics and quantum information processing. For several years, researchers have aspired to extend such detection possibilities to larger scale strongly correlated quantum systems, in order to record in-situ images of a quantum fluid in which each underlying quantum particle is detected. Here we report on fluorescence imaging of strongly interacting bosonic Mott insulators in an optical lattice with single-atom and single-site resolution.

 We present a fault-tolerant semi-global control strategy for universal quantum computers. We show that N-dimensional array of qubits where only (N-1)-dimensional addressing resolution is available is compatible with fault-tolerant universal quantum computation. What is more, we show that measurements and individual control of qubits are required only at the boundaries of the fault-tolerant computer, i.e. holographic fault-tolerant quantum computation.

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).

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.

We introduce a new approach to assess the error of control problems we aim to optimize. The method offers a strategy to define new control pulses that are not necessarily optimal but still able to yield an error not larger than some fixed a priori threshold, and therefore provide control pulses that might be more amenable for an experimental implementation. The formalism is applied to an exactly solvable model and to the Landau–Zener model, whose optimal control problem is solvable only numerically.

• 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

FUTURE AND EMERGING TECHNOLOGIES QIFT OPEN DAY will take place on 15th April 2011 at University of Warsaw.
 

The purpose of the Open Day is to promote European research in Quantum Information Foundations and Technologies (QIFT) on a broad forum involving government, academia, media, and industry. The event will also provide an opportunity to discuss forthcoming initiatives in Future and Emerging Technologies.