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University of Rome La Sapienza, University of Naples Federico II, ICFO - Institute of Photonic Sciences, Federal University of Rio de Janeiro and National University of Singapore | Date: 2014-12-10

The present invention concerns an ultra-sensitive photonic tiltmeter or goniometer utilizing a novel optical effect named photonic polarization gear effect, based on the orbital angular momentum of the light, to measure with high resolution and sensitivity the roll angle of a rotating object relative to a fixed measurement stage, or to perform related angular measurements. More in detail, the present invention concerns an optical system that uses a pair of photonic devices named q-plates in combination with suitable polarization optics to greatly enhance the measurement sensitivity and resolution of angular measurements based on the polarization of light. Our invention can be combined with all existing methods for the measurement of roll angles based on the polarization of light and results in an enhancement of the corresponding angular resolution and sensitivity.

Massignan P.,ICFO - Institute of Photonic Sciences | Zaccanti M.,University of Florence | Bruun G.M.,University of Aarhus
Reports on Progress in Physics | Year: 2014

In this review, we discuss the properties of a few impurity atoms immersed in a gas of ultracold fermions - the so-called Fermi polaron problem. On one hand, this many-body system is appealing because it can be described almost exactly with simple diagrammatic and/or variational theoretical approaches. On the other, it provides a quantitatively reliable insight into the phase diagram of strongly interacting population-imbalanced quantum mixtures. In particular, we show that the polaron problem can be applied to the study of itinerant ferromagnetism, a long-standing problem in quantum mechanics. © 2014 IOP Publishing Ltd.

Corning Inc., ICFO - Institute of Photonic Sciences, Catalan Institution for Research and Advanced Studies | Date: 2016-02-16

Described herein are improved dewetting methods and improved patterned articles produced using such methods. The improved methods and articles generally implement continuous ultra-thin metal-containing films or film stacks as the materials to be dewetted. For example, a method can involve the steps of providing a substrate that has a continuous ultra-thin metal-containing film or film stack disposed on a surface thereof, and dewetting at least a portion of the continuous ultra-thin metal-containing film or film stack to produce a plurality of discrete metal-containing dewetted islands on the surface of the substrate.

Corning Inc., ICFO - Institute of Photonic Sciences, Catalan Institution for Research and Advanced Studies | Date: 2015-02-18

A textured article that includes a transparent substrate having at least one primary surface and a glass, glass-ceramic or ceramic composition; a micro-textured surface on the primary surface of the substrate, the micro-textured surface comprising a plurality of hillocks; and a nano-structured surface on the micro-textured surface, the nano-structured surface comprising a plurality of nano-sized protrusions or a multilayer coating comprising a plurality of layers having a nano-scale thickness. Further, the hillocks have an average height of about 10 to about 1000 nm and an average longest lateral cross-sectional dimension of about 1 to about 100 m, and the nano-sized protrusions have an average height of about 10 to about 500 nm and an average longest lateral cross-sectional dimension of about 10 to about 500 nm. The substrate may be chemically strengthened with a compressive stress greater than about 500 MPa and a compressive depth-of-layer greater than about 15 m.

Baffou G.,Aix - Marseille University | Quidant R.,ICFO - Institute of Photonic Sciences | Quidant R.,Catalan Institution for Research and Advanced Studies
Chemical Society Reviews | Year: 2014

Noble metal nanoparticles supporting plasmonic resonances behave as efficient nanosources of light, heat and energetic electrons. Owing to these properties, they offer a unique playground to trigger chemical reactions on the nanoscale. In this tutorial review, we discuss how nanoplasmonics can benefit chemistry and review the most recent developments in this new and fast growing field of research. © 2014 the Partner Organisations.

Lakadamyali M.,ICFO - Institute of Photonic Sciences
ChemPhysChem | Year: 2014

Super-resolution microscopy is increasingly becoming an important tool for biological research, providing valuable information at the nanometer-length scales inside cells and tissues. In the past decade numerous technological advancements have transformed super-resolution microscopes into powerful tools of discovery. While the first super-resolution images took several hours to acquire, recent progress has led to tremendous improvement in acquisition speed, enabling researchers to probe dynamic processes in living cells with unprecedented spatiotemporal resolution. This minireview focuses on the recent developments in live-cell super-resolution microscopy and its biological applications. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Fritz T.,ICFO - Institute of Photonic Sciences
Reviews in Mathematical Physics | Year: 2012

Tsirelson's problem asks whether the set of nonlocal quantum correlations with a tensor product structure for the Hilbert space coincides with the one where only commutativity between observables located at different sites is assumed. Here it is shown that Kirchberg's QWEP conjecture on tensor products of C*-algebras would imply a positive answer to this question for all bipartite scenarios. This remains true also if one considers not only spatial correlations, but also spatiotemporal correlations, where each party is allowed to apply their measurements in temporal succession. We provide an example of a state together with observables such that ordinary spatial correlations are local, while the spatiotemporal correlations reveal nonlocality. Moreover, we find an extended version of Tsirelson's problem which, for each nontrivial Bell scenario, is equivalent to the QWEP conjecture. This extended version can be conveniently formulated in terms of steering the system of a third party. Finally, a comprehensive mathematical appendix offers background material on complete positivity, tensor products of C*-algebras, group C*-algebras, and some simple reformulations of the QWEP conjecture. © 2012 World Scientific Publishing Company.

Fritz T.,ICFO - Institute of Photonic Sciences
New Journal of Physics | Year: 2012

Bell's theorem witnesses that the predictions of quantum theory cannot be reproduced by theories of local hidden variables in which observers can choose their measurements independently of the source. Working out an idea of Branciard, Rosset, Gisin and Pironio, we consider scenarios which feature several sources, but no choice of measurement for the observers. Every Bell scenario can be mapped into such a correlation scenario, and Bell's theorem then discards those local hidden variable theories in which the sources are independent. However, most correlation scenarios do not arise from Bell scenarios, and we describe examples of (quantum) non-locality in some of these scenarios, while posing many open problems along the way. Some of our scenarios have been considered before by mathematicians in the context of causal inference. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.

Hildner R.,ICFO - Institute of Photonic Sciences | Brinks D.,ICFO - Institute of Photonic Sciences | Van Hulst N.F.,ICFO - Institute of Photonic Sciences
Nature Physics | Year: 2011

Quantum-mechanical phenomena, such as electronic coherence and entanglement, play a key role in several remarkably efficient natural processes including ultrafast electronic energy transfer and charge separation in photosynthetic light-harvesting. To gain insight into such dynamic processes of biomolecules it is vital to reveal relations between structural and quantum-mechanical properties. However, ensemble experiments targeting ultrafast coherences are hampered by the large intrinsic heterogeneity in these systems at physiological conditions, and single-molecule techniques have not been available until now. Here we show, by employing femtosecond pulse-shaping techniques, that quantum coherences in single organic molecules can be created, probed and manipulated at ambient conditions even in highly disordered solid environments. We find broadly distributed coherence decay times for different individual molecules giving direct insight into the structural heterogeneity of the local surroundings. Most importantly, we induce Rabi oscillations and control the coherent superposition state in a single molecule, thus carrying out a basic femtosecond single-qubit operation at room temperature. © 2011 Macmillan Publishers Limited. All rights reserved.

Eisert J.,Free University of Berlin | Friesdorf M.,Free University of Berlin | Gogolin C.,Free University of Berlin | Gogolin C.,ICFO - Institute of Photonic Sciences | Gogolin C.,Max Planck Institute of Quantum Optics
Nature Physics | Year: 2015

How do closed quantum many-body systems driven out of equilibrium eventually achieve equilibration? And how do these systems thermalize, given that they comprise so many degrees of freedom? Progress in answering these - and related - questions has accelerated in recent years - a trend that can be partially attributed to success with experiments performing quantum simulations using ultracold atoms and trapped ions. Here we provide an overview of this progress, specifically in studies probing dynamical equilibration and thermalization of systems driven out of equilibrium by quenches, ramps and periodic driving. In doing so, we also address topics such as the eigenstate thermalization hypothesis, typicality, transport, many-body localization and universality near phase transitions, as well as future prospects for quantum simulation. © 2015 Macmillan Publishers Limited.

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