Blog

Quantum Vision Project Accepted

Tue, 13 Dec 2016 09:32:00 +0000

Five groups, all from the University of Geneva, have been awarded a Sinergia multidisciplinary Swiss national project. The aim of this ambitious project is to investigate whether our senses, and especially our vision, are sensitive to purely quantum phenomena, like quantum interferences and photon entanglement.

Single Photon Path Entangled States for Quantum Communication

Fri, 14 Oct 2016 09:15:00 +0000

Fernando Monteiro Thesis Defence Pinchat, Seminar Room, 11:15am

Hybrid quantum technology in the presence of losses

Mon, 03 Oct 2016 08:00:00 +0000

Prof. Alex Lvovsky, University of Calgary, Canada, and the Russian Quantum Center, Moscow-Russia Lundi 3 octobre à 10:00, Salle de séminaire de Pinchat

Bar du GAP 2016

Fri, 23 Sep 2016 18:00:00 +0000

We are pleased to inform you that the bar du GAP 2016 will take place on Friday September 23 starting at 8:00PM! The theme of the party is Hollywood/cinema. Free entrance / we sell cheap drinks / one free drink if you are disguised.

Heralded quantum steering with no detection loophole over a high-loss quantum channel

Fri, 16 Sep 2016 09:30:00 +0000

Morgan Weston, Griffith University, Australia. Entanglement is a key resource to many quantum information protocols, making rigorous verification of remote shared entanglement highly sought after. We design and experimentally implement a new heralded quantum steering protocol in order to verify shared entanglement over a high loss quantum channel, with the detection loophole closed. Our scheme uses entanglement swapping with two high-performance telecom-wavelength, polarisation-entangled photon sources and highly efficient detectors. Our approach has demonstrated violation of the steering inequality by two standard deviations with 14.8 dB of added channel loss, equivalent to approximately 80km of telecom fibre.

A quantum Fredkin gate

Fri, 16 Sep 2016 09:00:00 +0000

Joseph Ho, Griffith University, Australia. While the salient features of a quantum computer have been shown in proof-of-principle experiments, e.g., single- and two-qubit gates forming a universal gate set, difficulties in scaling up the quantum systems to control multiple qubits have made demonstrations of mode complex operations intractable. This is exemplified by the classical Fredkin (or controlled-SWAP) gate for which, despite many theoretical proposals, a true quantum analogue has yet to be realised. Here, by directly adding control to the two qubit SWAP unitary, we use photonic qubit logic to report on one of the first experimental demonstration of a quantum Fredkin gate.

A quantum entropy source on an InP photonic integrated circuit for random number generation

Fri, 16 Sep 2016 08:30:00 +0000

Random number generators are essential to ensure performance in information technologies, including cryptography, stochastic simulations and massive data processing. The quality of random numbers ultimately determines the security and privacy that can be achieved, while the speed at which they can be generated poses limits to the utilisation of the available resources. In this work we propose and demonstrate a quantum entropy source for random number generation on an indium phosphide photonic integrated circuit made possible by a new design using two-laser interference and heterodyne detection. The resulting device offers high-speed operation with unprecedented security guarantees and reduced form factor. It is also compatible with complementary metal-oxide semiconductor technology, opening the path to its integration in computation and communication electronic cards, which is particularly relevant for the intensive migration of information processing and storage tasks from local premises to cloud data centres.

Microresonator based Optical Frequency Combs: from Soliton Physics to Coherent terabit communications

Wed, 22 Jun 2016 09:00:00 +0000

Prof. Tobias Kippenberg, EPFL, Salle de séminaire de Pinchat. Developments at EPFL will be reviewed, and results using silicon nitride photonic chip based resonators and ultra high Q crystalline MgF2 resonators presented. In particular low noise broadband comb operation will be discussed, their use in coherent telecommunications for terabit/second coherent data communication and the extension of these Kerr frequency combs to the mid-IR. Moreover the formation of dissipative temporal solitons discovered in microresonators will be discussed.

24th Journée du GAP

Thu, 26 May 2016 12:15:00 +0000

24th Journée du GAP, Jeudi 26 mai 2016. Université de Genève, L’Ecole de Physique, Le Grand Auditoire, 24, Quai Ernest-Ansermet, Genève

Experimental Quantum Communications in Space

Thu, 12 May 2016 09:15:00 +0000

Salle de séminaire de Pinchat, Prof. Paolo Villoresi, University of Padova (Italy)

Quantum Nonlinear Optics: Nonlinear Optics Meets the Quantum World

Thu, 28 Apr 2016 09:00:00 +0000

Bob Boyd Colloquium, Grand Amphitheatre, Ecole de Physique, 24 Quai Ansermat, 1205 Genève

Single photon interaction and entanglement

Tue, 05 Apr 2016 15:00:00 +0000

Thiago Guerreiro Thesis Defence, Pinchat, Seminar Room