# Preventing Plagiarism University of Bergen style!

University of Bergen has explained the problem, and consequences, of plagiarism with Hollywood-level production values in this grand video. This should be must viewed by every wanna-be research student. This was posted by Andrew Gelman

P.S. Press CC for subtitles in English.

# (Belated) Turing Centennial Series from ‘in Theory’ blog

I have highly enjoyed reading the series of posts on the blog of Luca Trevisan in honor of Alan Turing’s 100th birthday. The series of post has academic people who are gay or lesbian in the fields of Theoretical Computing and Cryptography. There have been a total of 8 posts starting from 0. Check them below:

I forgot to post these (despite having draft ready), hence the belated title.

# Upcoming Summer and Winter Quantum Schools

### 5TH WINTER SCHOOL ON PRACTICAL QUANTUM COMMUNICATIONS

Les Diablerets, Switzerland
January 21-24, 2013

This program will deal with quantum cryptography, quantum computing and quantum repeaters. The goal of this event is to introduce this exciting topic in a relaxed and stimulating atmosphere to a general audience of physicists and computer scientists with little or no background in practical quantum communications. Special emphasis will be placed on practical aspects of quantum communications, such as the implementation of Quantum Key distribution systems and quantum repeaters, as well as concrete steps towards a quantum computer. The emerging applications of these promising technologies will also be discussed.

By including hands-on tutorials, the Winter School will offer participants the unique opportunity to learn to operate a real quantum cryptography system, as well as single-photon detectors.

In order to maximize the possibility to interact with instructors and to allow intensive hands-on tutorials, the number of participants is limited to 16. Applications will be accepted on a first come, first served basis.

### 1st Summer School of Physics and Technology of Matter

Otranto, Italy
September 16-22, 2012

This school aims to

• To broaden and deepen the background knowledge of young researchers, mainly PhD students and post-docs, in the general areas of superfluidity, quantum optical interference, quantum information and coherence, laser physics, magnetism and spintronics, superconductivity, Bose-Einstein Condensation, through a series of advanced lectures given by recognized experts in these fields.
• to provide a perspective of the latest research and future trends in these areas.

# Research in Quantum Computing and Information

While searching for information about the groups and universities that conduct studies in Quantum Computation and Quantum information science I stumbled across this excellent maintained list

## Research in Quantum Computing and Information

This would certainly be useful for choosing graduate school.

# Q+ Hangout: Francesco Buscemi

Details of upcoming Q+ Hangout

Date: 28th August 2012

Time: 2pm British Summer Time; 6.30pm Indian Standard Time

Speaker: Francesco Buscemi (Nagoya University)

Title: All entangled quantum states are nonlocal: equivalence between locality and separability in quantum theory

Abstract:

In this talk I will show how, by slightly modifying the rules of nonlocal games, one can prove that all entangled states violate local realism.

As it is well known, Bell inequalities, which are used to test the violation of local realism, can be equivalently reformulated in terms of nonlocal games (namely, cooperative games with incomplete information) played between one referee and two (or more) players, these latter being separated so to make any form of communication between them impossible during the game. Quantum nonlocality is that property of quantum states that allows players sharing them to win nonlocal games more frequently than the assumption of local realism would imply.

However, as Werner proved in 1989, not all quantum states enable such a violation of local realism. In particular, Werner showed the existence of quantum states that cannot be created locally (the so-called “entangled” states) and, yet, do not allow any violation of local realism in nonlocal games. This fact has been since then considered an unsatisfactory gap in the theory, attracting a considerable amount of attentions in the literature.

In this talk I will present a simple proof of the fact that all entangled states indeed violate local realism. This will be done by considering a new larger class of nonlocal games, which I call “semiquantum,” differing from the old ones merely in that the referee can now communicate with the players through quantum channels, rather than being restricted to use classical ones, as it was tacitly assumed before. I will then prove that one quantum state always provides better payoffs than another quantum state, in semiquantum nonlocal games, if and only if the latter can be obtained from the former, by local operations and shared randomness (LOSR). The main claim will then follow as a corollary.

The new approach not only provides a clear theoretical picture of the relation between locality and separability, but also suggests, thanks to its simplicity, new experimental tests able in principle to verify the violation of local realism in situations where previous experiments would fail.

Based on http://arxiv.org/abs/1106.6095

To view the seminar live, go to http://gplus.to/qplus at the appointed hour.

To stay up to date on future Q+ hangouts, follow us on:

# Around the web

• A nice and beautiful article titled ‘Why Quantum mechanics has to be complex and linear…‘ by Luboš Pilsen, a Czech Physicist. It is a must read for everyone
• People from the Institute for Quantum Information and Mattter @ Caltech, now have a blog : Quantum Frontiers. The blog already has some excellent articles like ‘How to build a teleportation machine: Intro to qubits
• There’s an interview with CERN Director here.
• The ATLAS Collaboration at LHC have released series of papers here. Apparently there is no deviation from Standard Model, I think.
• Two more collaborators CDF and D0 from Tevatron at Fermilab have combined data of their searches for Higgs Boson and have reported evidence of new particle. For full report check here.

# Quantum Routers

Recently, a team of physicists from Tsinghau University in China has succeeded in creating a device that is capable of routing quantum information. The device is capable of routing one qubit, for now. While the paper does not claim to be a solution for quantum internet, it certainly proves that routing the quantum data is possible and indeed bring dream of quantum internet one step close to reality.

Experimental demonstration of an entanglement-based quantum router

ABSTRACT

We report an experiment that demonstrates full function of a quantum router using entangled photons, where the paths of a single-photon pulse are controlled in a coherent fashion by polarization of another single photon. Through a projective measurement, we prepare the polarization of the control photon in arbitrary superposition states, leading to coherent routing of the target photon in quantum superposition of different paths. We demonstrate quantum nature of this router through optical measurements based on quantum state tomography and show an average fidelity of $(93.24\pm 0.23)%$ for the quantum routing operation.

arXiv.org

via Phys.org