2016 Impact factor 2.787


Giving light a good squeeze

Multi-mode optical systems can improve precision measurements in the domain of quantum imaging and metrology. In this context, mastering quantum fluctuations and correlations in complex optical systems is crucial. In a recent EPJ D paper, the authors G. Patera, N. Treps, C. Fabre and G.J. de Valcárcel present the quantum model for an optical parametric oscillator synchronously pumped by a mode locked laser. To cope with the complexity of a system that usually involves about 100 000 modes, the authors introduce new physical objects that they call supermodes, which are proper combinations of standard modes. Their dynamics is studied from both a classical and a quantum point of view with respect to the experimental condition considered. This study shows that a synchronously pumped optical parametric oscillator is a suitable and malleable source of highly multimode non-classical light in the temporal domain.

To read the full paper "Quantum theory of synchronously pumped type I optical parametric oscillators: characterization of the squeezed supermodes" Eur. Phys. J. D 56, 123-140 (2010) click here

Athene Donald wins Glamour award

Athene Donald, the former editor in chief of EPJ E and current member of its advisory editorial board, has won the Science & Technology Award issued by women’s magazine Glamour.

Daan Frenkel becomes Editor in Chief of EPJ E

EPJ E welcomes Daan Frenkel as new Editor in Chief, next to Richard Jones and Frank Jülicher. Daan Frenkel is a computational physicist who's research focuses on numerical exploration of routes to design novel, self-assembling structures and materials. Currently he is a professor at the universities of Cambridge, Amsterdam, Utrecht and Beijing. He is a foreign member of the British Royal Society and he has many received prestigious awards such as the Aneesur Rahman Prize of the APS, the Spinoza Prize of the Dutch Research Council and the Berni J. Alder CECAM Prize.

Nigel Mason becomes Editor in Chief of EPJ D

We are pleased to announce that from January 2010 Nigel Mason, Professor of Physics at the Open University, UK, will be leading EPJ D, together with Kurt Becker and Claude Fabre. Nigel Mason brings to the journal an interdisciplinary approach to the AMOP field. His research covers a wide range of AMOP topics spanning physics and chemistry including astrochemistry, atmospheric science, surface science and spectroscopy. Since the 1990s he has studied the spectroscopy of over 100 molecules (mainly of atmospheric interest) using synchrotron radiation quantifying their photolysis rates and global warming potential. Research on the formation of molecules by irradiation of low temperature (20K) ices has led to a new research programme exploring processes on planetary systems and in the interstellar medium. Most recently his research has extended to study radiation damage processes within biomolecular systems including DNA.

First proton–proton collisions at the LHC as observed with the ALICE detector

Figure shows the first pp collision candidate by the event display in the ALICE counting room (3D view).

On 23rd November 2009, during the early commissioning of the CERN Large Hadron Collider (LHC), two counter-rotating proton bunches were circulated for the first time concurrently in the machine, at the LHC injection energy of 450 GeV per beam, allowing all LHC experiments to report first collision candidates.

284 such candidates were recorded by the ALICE experiment, allowing the events to be immediately reconstructed and analyzed. The results obtained by measuring the spatial distribution (specifically, the pseudorapidity density) of charged primary particles in the central region, were found to be consistent with previous measurements in proton-antiproton interactions at the same centre-of-mass energy at the CERN SppS collider (UA5 Collaboration, G.J. Alner et al., Z Phys. C 33 (1986), DOI 10.1007/BF01410446).

To read this paper click here

J Schukraft, the ALICE spokesman, said: This important benchmark test illustrates also the excellent functioning and rapid progress of the LHC accelerator, and of both the hardware and software of the ALICE experiment, in this early start-up phase.
The paper is published open access on SpringerLink.com and distributed under the Creative Commons Attribution Noncommercial License.

To read the full paper click here

Atom interferometry in free flight

Philippe Bouyer and co-workers in France performed a range of impressive experiments with an atom interferometer in free flight, onboard an Airbus aircraft making "micro-gravity jumps". These experiments successfully demonstrate that when atoms are sufficiently cooled and controlled, their wave properties can be used to perform interferometry in a way analogous to standard interferometry with light. This moves the field closer to the implementation of a range of sensors for e.g. gravity, rotation and inertia with unprecedented accuracy. Such devices will be potentially very useful in satellites and in space missions.

To read the full paper by Philippe Bouyer et al. on "Light-pulse atom interferometry in microgravity" click here

Tidal waves on liquid Helium-4

An analytical theory explains why a probe molecule such as Na2 on the surface of a liquid 4He droplet creates soft vibrations which can be used to study the dynamics of the droplet surface with optical spectroscopy.

To read the full paper by Hizhnyakov, Tehver and Benedek click here

Microscopic modeling of electronic quantum nanodevices reviewed in a Colloquium paper by D. Taj, R.C. Iotti and F. Rossi

Quantum devices represent an important topic of modern nanoscience, characterized by its multi-disciplinary flavor where condensed matter physics, quantum theory, and information technology merge into a unique body of knowledge. In this Colloquium paper Taj and co-workes review and discuss how to work out a microscopic modeling of state-of-the-art electronic quantum devices. The emphasis is on the description of energy-relaxation and decoherence phenomena. Finally, the authors propose an alternative formulation of the problem in terms of a generalized Fermi's Golden Rule.

Click here to view the full text: [D. Taj et al., Eur. Phys. J. B 72 (2009)]

The unusual electronic and transport properties of graphene-based nanostructures reviewed in a Colloqium paper by Dubois, Zanolli, Declerck, and Charlier in EPJ B

Graphene-based nanostructures are expected to display the extraordinary electronic, thermal and mechanical properties and are thus promising candidates for a wide range applications and opening alternatives to present silicon-based electronics devices. This paper reviews the electronic and quantum transport properties of these carbon nanomaterials in which confinement effects are playing a crucial role. After reviewing the transport properties of defect-free systems, doping and topological defects are also proposed as strategy to tailor quantum conductance in these materials.

Time stamping in Einstein-Podolsky-Rosen experiments

Using the time of detection of each single photon, the authors falsify a class of non-ergodic local models that have not been tested in previous experiments on the Bell inequality.

To read the full paper by M.B. Agüero, A.A. Hnilo, M.G. Kovalsky and M.A. Larotonda click here

Frank Schweitzer and Alessandro Vespignani

Conference announcements


Magnetic Island, Queensland, Australia, 22-24 July 2017