Highlights for the Virtual Institute of Quantum Communication

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Format: 2022-10-07
Format: 2022-10-07
Format: 2022-10-07

22nd Mar 2014

P. Jouguet, S. Kunz-Jaques, A. Leverrier, Ph. Grangier and E. Diamanti
Nature Photonics 7, 378-381 (2013)

Continuous-variable systems represent a valid alternative to QKD systems based on finite-dimensional
encodings. Their major advantage is that they only require standard telecommunication technology, and in
particular, that they do not use photon counters. However, these systems were considered up till now
unsuitable for long-distance communication.

In their work, Jouguet and colleagues overcome all previous limitations and demonstrate for the first time

22nd Mar 2014

B. Fröhlich, J. F. Dynes, M. Lucamarini, A. W. Sharpe, Z. Yuan and A. J. Shields
Nature 501, 69-72 (2013)

QKD guarantees secure communication against unbounded eavesdroppers and represents a mature quantum
technology. However, so far no convincing answer has been given to the question of how to extend the scope
of QKD beyond applications in dedicated high security networks.

In their work, Fröhlich and colleagues show that adopting simple and cost-effective telecommunication
technologies to form a quantum access network can greatly expand the number of users in quantum networks

22nd Mar 2014

S. Takeda, T. Mizuta, M. Fuwa, P. van Loock and A. Furusawa
Nature 500, 315 (2013)

7th Jan 2014

Bit commitment is a fundamental cryptographic primitive in which Bob wishes to commit a secret bit to Alice. Perfectly secure bit commitment between two mistrustful parties is impossible through asynchronous exchange of quantum information.

22nd Nov 2013

The Chalmers SOLID group recently published an article in Physical Review Letters in which they show, in the context of single-photon detection, that an atomic three-level model for a transmon in a transmission line does not support the predictions of the nonlinear polarizability model known as the cross-Kerr effect.

22nd Nov 2013

The Chalmers team led by Chris Wilson recently published a paper in Physical Review Letters in which they investigated the effective interaction between two microwave fields, mediated by a transmon-type superconducting artificial atom that is strongly coupled to a coplanar transmission line. The interaction between the fields and atom produces an effective cross–Kerr coupling.

22nd Nov 2013

The Quantronics group at SOLID partner CEA have recently published a paper in Physical Review Letters in wihch they measure the quantum fluctuations of a pumped nonlinear resonator using a superconducting artificial atom as an in situ probe. The qubit excitation spectrum provided access to the frequency and amount of excitation of the intracavity field fluctuations, from which we infer its effective temperature.

22nd Nov 2013

In a recent publication in Nature Communications the TU-Delft team including SOLID partner Leo Kouwenhoven demonstrated a semiconductor nanowire based single photon source with a near unity efficiency.  To do this, the group positioned single quantum dots on the axis of a tailored nanowire waveguide using bottom-up growth.

20th Feb 2013

As its last last deliverable, QUIE2T WP2 has submitted the final updates of the QIPC Strategic Report (v. 1.8) and the Quantum Information Classification scheme QICS (v. 1.3). A detailed report on the update is available from the WP2 deliverables page (deliverable D2.2.2).

9th Oct 2012

The Nobel Prize in Physics 2012 was awarded jointly to Serge Haroche and David J. Wineland "for ground-breaking experimental methods that enable measuring and manipulation of individual quantum systems".

Read the official announcement on nobelprize.org.

8th Oct 2012

Following QIPC2009 in Rome and QIPC2011 in Zurich we have the pleasure to announce another edition of the QUANTUM INFORMATION PROCESSING AND COMMUNICATION CONFERENCE – QIPC2013.

7th Oct 2012

The reports are available for public download at the WP2 deliverables page. They contain a detailed description of the features that are integrated in the qurope.eu web site, that allow a classification and analysis of the database material that is relevant to QIPC.

19th Mar 2012

The on-line version of the document can be browsed here.
A pdf of the full document will be generated following this link.
Old versions of the QICS are archived here.

22nd Aug 2011

Bit commitment is a fundamental cryptographic primitive with numerous applications. Quantum information allows for bit commitment schemes in the information theoretic setting where no dishonest party can perfectly cheat. The previously best-known quantum protocol by Ambainis achieved a cheating probability of at most 3/4, while Kitaev showed that no quantum protocol can have cheating probability less than 1/sqrt{2}. Closing this gap has since been an important and open question. In this paper, the authors provide the optimal bound for quantum bit commitment.

14th Feb 2011

The results of local measurements on some composite quantum systems cannot be reproduced classically. This impossibility, known as quantum nonlocality, represents a milestone in the foundations of quantum theory. Quantum nonlocality is also a valuable resource for information-processing tasks, for example, quantum communication, quantum key distribution, quantum state estimation or randomness extraction. Still, deciding whether a quantum state is nonlocal remains a challenging problem.

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