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The QuComm project, in the participants opinion, has been
highly successful. The project resulted in many technical breakthroughs in
quantum communication, and basically it has been setting the international
state-of-the-art in the area. Among technical highlights from the project
period we mention here the following, but as will be detailed in the report,
there are many other (equally) significant contributions:
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The first four entanglement quantum cryptography work
realised to date where all done within the QuComm consortium
GAP
(two systems), LANL/ILLINOIS, EXPUNIVIE and LMU).
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The first experimental demonstration of quantum
teleportation at telecom wavelengths (1310-1550nm) recently achieved by
GAP using time-bin entanglement, and the field experiments of EXPUNIVIE of
quantum state teleportation over 600 m (under the Danube river in Vienna).
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The realisation of multiphoton entanglement protocols, such
as quantum secret sharing using pseudo GHZ-states by GAP, four-photon
entangled state correlation by EXPUNIVIE, the work of OXFORD on
stimulated emission into
polarisation entangled modes “entangled photon laser” and the use of the
source in the first experimental demonstration of violation of a spin-1
Bell inequality. Furthermore,
the
demonstration by LMU of the “mean-king quantum game” forming the basis for
novel, secure quantum communication protocols.
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The work of GAP and LANL on the investigations of the
robustness of entanglement and entanglement purification. The work of
Oxford on quantum error filtering, and of KTH and GAP on multilevel
quantum cryptography.
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The free space quantum cryptography trials of LANL up to 10
km and DERA (now QinetiQ) up to 1.2 km (most of the DERA work falls within
EQCSPOT). While not yet using entanglement schemes the trials are very
important with respect to investigation quantum cryptography under field
like situations.
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The demonstration of third-order mode laser which is
phase-matched for down-conversion by TH LCR (THALES)
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The result of
Oxford about the realization of close-to-optimal quantum
cloning of single photons by stimulated emission in parametric
down-conversion. Very similar results, using a commercial Erbium doped
optical amplifier operating in the single-photon input regime, was also
demonstrated by GAP.
The work within QuComm has generated extensive media coverage
worldwide. A number of publications and conference presentations (invited
talks, regular talks, posters) where presented by QuComm members. Liaisons
were also created to the IST OPTIMIST project (with QuComm presented at ECOC
all three years of the project), as well as to the QUIPROCONE network.
Concerning the industrial take-up and use of results excellent industrial
liaisons exist both within the consortium (THALES and QinetiQ) as well as
with start-ups such as Geneva based idQuantique.
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