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.

The QI group at the University of Leeds is launching a new taught MSc programme in Quantum Technologies this year.

The Department of Applied Mathematics at H.I.T. – Holon Institute of Technology (Holon, Israel) invites applications for a postdoctoral position in Mathematical Physics. The successful candidate is expected to be involved into a research at the crossroad of the Random Matrix Theory, Quantum Chaotic Systems, and the Theory of Integrable Hierarchies. Previous research record in one of those fields is an advantage, strong analytical skills is a must.

Quantum Information Theory is the study of information-processing tasks such as storage and transmission of information, or manipulation of entanglement, using quantum-mechanical systems. Until very recently, the study of these processes was limited to the case in which the required resources, e.g. information sources, communication channels or entanglement resources, were assumed to be available for an infinite number of independent uses.

ArXiv identifier: 

0903.0543

Speakers: 

Giulio Chiribella

Authors: 

A. Bisio, G. Chiribella, G. M. D'Ariano, S. Facchini, P. Perinotti

We prove that the optimal strategy to store an unknown group transformation into a quantum memory is to apply the available uses in parallel on a suitable entangled state. The optimal retrieving strategy is the incoherent, ``measure-and-rotate'' strategy, in which the quantum memory is measured and a unitary depending on the outcome is performed. The same result holds for approximate re-alignment of reference frames for quantum communication.

The National Quantum Information Centre of Gdansk (NQuantIC), together with the University of Gdansk is seeking an experimentalist interested in a position (professor or senior researcher) in experimental quantum optics and/or quantum information technology.

The Quantum Information Theory Group QUIT in Pavia (www.qubit.it) is searching for highly motivated postdoctoral scientists to join the young and dynamic research team led by Giacomo M. D'Ariano at the "A. Volta" Physics Department of the University of Pavia (www.unipv.it)

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