New results in quantum cryptography show that the original protocol based on Bell's inequality is so powerful that it extends beyond the quantum realm. In the recent issue of Physics World Artur Ekert traces it all back to Einstein's considerations about physical reality.

Post-Doctoral fellowships at the Institute for Quantum Computing

The Institute for Quantum Computing is inviting applications for postdoctoral positions in all aspects of quantum information processing, bridging areas from fundamental theory to physical implementations.

Researchers in Austria, Germany and the US, proposed a scheme to couple the motion of a single atom with a crystal membrane. This scheme could be used to observe quantum-mechanical effects on a larger scale than ever before.

Researchers at the National Institute of Standards and Technology (NIST) in Boulder, CO, have demonstrated multiple computing operations on quantum bits--a crucial step toward building a practical quantum computer.

Professor (W2) in Theoretical Physics

The successful candidate is expected to do research in quantum information theory, the dynamics of large complex quantum systems, or the space-time aspects of quantum dynamics.

The position will be based at the Institute for Theoretical Physics, and is associated with the research cluster QUEST (Centre for Quantum Engineering and Space-Time Research).
Close collaboration with QUEST and with the quantum information group of R. F. Werner is expected.

Screening will begin on September 15th.

A PhD studentship in Theoretical Condensed Matter Physics/Semiconductor Optics is available in the School of Physics at Trinity College Dublin, in the area of many-body phenomena in coupled light-matter systems (such as quantum dots and semiconductor microcavities). The project will explore many-particle effects in decoherence, using radiatively coupled quantum dots as a model system.

Precise control of quantum effects is vital to the realization of entirely new technologies. For example, a computer based on quantum physical principles is expected to outperform today's classical computers. In communication technology, quantum devices are already commercially available which allow secure transmission of data. Controlling the properties of photons down to the quantum level is at the heart of these technologies. In recent years, scientists in the group of Prof.

ArXiv identifier: 

0906.2731

Speakers: 

Masaki Owari

Authors: 

Miguel Navascues, Masaki Owari, Martin B. Plenio

In this paper, we present new progress on the study of the symmetric extension criterion for separability. First, we show that a perturbation of order O(1/N) is sufficient and, in general, necessary to destroy the entanglement of any state admitting an N Bose symmetric extension. On the other hand, the minimum amount of local noise necessary to induce separability on states arising from N Bose symmetric extensions with Positive Partial Transpose (PPT) decreases at least as fast as O(1/N^2).

Single atoms have been spotted doing the quantum version of the random walk by physicists in Germany. This sighting of a “quantum walk” could help in the design of quantum search algorithms, or in the understanding of the transition from the quantum, microscopic world to the classical, macroscopic world.

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