The intrinsic rotation of electrons - the "spin" - remains unused by modern electronics. If use as an information carrier were possible, the processing power of electronic components would suddenly increase to a multiple of the present capacity. In cooperation with colleagues from Dortmund, St. Petersburg and Washington, Bochum physicists have now succeeded in aligning electron spin, bringing it to a controlled "waver" and reading it out. The electron spin can also be realigned as required at any time using optical pulses.

ArXiv identifier: 
0901.4454
Speakers: 
Martin Plenio
Authors: 
Filippo Caruso, Alex W. Chin, Animesh Datta, Susana F. Huelga, Martin B. Plenio

Transport of excitations through networked systems plays an important role in many areas of physics, chemistry, and biology. The uncontrollable interaction of the transmission network with a noisy environment is usually assumed to deteriorate its transport capacity, especially so when the system is fundamentally quantum mechanical. Here we identify key mechanisms through which dephasing noise, contrary to expectation, may actually aid transport through a dissipative network.

ArXiv identifier: 
0903.0612
Speakers: 
Daniel Burgarth
Authors: 
Daniel Burgarth, Koji Maruyama

Identifying the nature of interactions in a quantum system is essential in understanding any physical phenomena. Acquiring information on the Hamiltonian can be a tough challenge in many-body systems because it generally requires access to all parts of the system. We show that if the coupling topology is known, the Hamiltonian identification is indeed possible indirectly even though only a small gateway to the system is used. Surprisingly, even a degenerate Hamiltonian can be estimated by applying an extra field to the gateway.

ArXiv identifier: 
0807.2444
Speakers: 
Alvaro Feito Boirac
Authors: 
J.S. Lundeen, A. Feito, H. Coldenstrodt-Ronge, K.L. Pregnell, Ch. Silberhorn, T.C. Ralph, J. Eisert, M.B. Plenio, I.A. Walmsley

Measurement connects the world of quantum phenomena to the world of classical events. It plays both a passive role, observing quantum systems, and an active one, preparing quantum states and controlling them. Surprisingly - in the light of the central status of measurement in quantum mechanics - there is no general recipe for designing a detector that measures a given observable. Compounding this, the characterization of existing detectors is typically based on partial calibrations or elaborate models. Thus, experimental specification (i.e.

We are pleased to inform that Quantiki has a new functionality. We introduce Quantiki Video Abstracts - a place where you can upload video abstracts of your papers. If you want to promote your paper just make a short video in which you introduce it and upload it on Quantiki and share it with Quantum Information community. You can also subscribe YouTube channel with Quantiki video abstracts.

Scientists in the UK and US have shown how to increase photovoltaic efficiencies by attaching nanocrystal quantum dots to patterned semiconductor layers. The approach exploits the phenomenon of non-radiative energy transfer and could, say the researchers, lead to a new generation of more efficient solar cells.

HP Labs - Post-Doctoral Researcher in Experimental QKD

The Quantum Information Processing (QIP) Group is based in HP Labs Bristol UK, and is part of the Information and Quantum Systems Laboratory (IQSL). The QIP group is seeking applicants for a fixed-term research appointment for two years, to work on the next stages of the implementation of "consumer quantum key distribution", HP's most advanced quantum information technology. The appointee will carry out research and development on short-range, free-space QKD for consumer applications.

Application deadline: 
Thursday, March 19, 2009

Quantum computation was a highly speculative enterprise facing serious technological obstacles until a shy young physicist came along. Dave Bacon tells the story of Alexei Kitaev’s big idea. Read more at PhysicsWorld.

Physicists have teleported quantum information between two atoms separated by a significant distance, for the first time. Until now this feat had only been achieved between photons, and between two nearby atoms through the intermediary action of a third. “Our system has the potential to form the basis for a large-scale ‘quantum repeater’ that can network quantum memories over vast distances” said group leader Christopher Munroe of the University of Maryland.

We're setting up a small Quantiki Workshop!!! If you're interested in getting to know the team, learning more about how Quantiki works, or would like to contribute and work with us - why don't you come along? It is also a good time to tell us how we could improve Quantiki or develope some new ideas and directions for this international non-profit project. Get back to us through the contact form at the top of this page!