The EU Integrated Project Qubit Applications (or QAP) is a
partnership of 40
academic and industrial groups at the cutting edge of quantum information
research. Initiated in 2005, QAP’s mission is to develop and implement novel
applications for quantum information processing, and to explore theoretical
concepts of quantum information. QAP partners have published over 1205 papers
in a variety of journals to date, including prestigious titles such as
Nature, Science, Physical Review Letters, Nature Photonics among others.
These papers mark a significant contribution to the worldwide effort to
understand, control and utilize quantum systems, and reflect the diverse
range of interests within the collaboration.
[read more]
'Technologies that exploit
the unique weirdness of
quantum mechanics could
debut in the very near
future, thanks to the
groundbreaking work of a
huge European research
consortium'.
'A huge
consortium of European researchers is solving some of the
fundamental obstacles blocking real quantum computing
applications in the short term. At the same time, it is helping
to pave the way to a quantum computer'.
(ICT Results is an editorial service created for the
European Commission to showcase EU-funded ICT research and
activities.
Information Causality - a new
principle of physics?
The
principle of Information
Causality, states that
communication of m classical
bits causes information gain of
at most m bits. In a recent
Physical Review Letter, QAP
researchers show that this
principle is respected both in
classical and quantum physics,
and that all stronger than
quantum correlations violate it.
We suggest that Information
Causality, being a
generalization of no-signalling,
is one of the foundational
properties of Nature. [read more]
In a recent Physical Review Letter, two QAP researchers
derived the problem of unambiguous comparison of a pair of unknown qubit unitary
channels. Using the framework of process positive operator valued measures (PPOVM)
they characterize all solutions and identify the optimal ones. They prove that
the entanglement is the key ingredient in designing the optimal experiment for
comparison of unitary channels. Without entanglement the optimality can not be
achieved. The proposed scheme is also experimentally feasible. [read more]
