Waveguide-based OPO source of entangled photon pairs (2009)
Pomarico, Enrico, Sanguinetti, Bruno, Gisin, Nicolas, Thew, Robert, Zbinden, Hugo, Schreiber, Gerhard, ...
In this paper we present a compact source of narrow-band energy-time entangled photon pairs in the telecom regime based on a Ti-indiffused Periodically Poled Lithium Niobate (PPLN) waveguide...
Practical fast gate rate InGaAs/InP single-photon avalanche photodiodes (2009)
Zhang, Jun, Thew, Rob, Barreiro, Claudio, Zbinden, Hugo
We present a practical and easy-to-implement method for high-speed near infrared single-photon detection based on InGaAs/InP single-photon avalanche photodiodes (SPADs), combining aspects of both...
Zhang, Jun, Thew, Rob, Gautier, Jean-Daniel, Gisin, Nicolas, Zbinden, Hugo
We present an active quenching application specific integrated circuit (ASIC), for use in conjunction with InGaAs/InP avalanche photodiodes (APDs), for 1550 nm single-photon detection. To evaluate...
High speed coherent one-way quantum key distribution prototype (2008)
Stucki, Damien, Barreiro, Claudio, Fasel, Sylvain, Gautier, Jean-Daniel, Gay, Olivier, Gisin, Nicolas, ...
We report the first real world implementation of a Quantum Key Distribution (QKD) system over a 43dB-loss transmission line in the Swisscom fibre optic network. The QKD system is capable of...
Deliverable D (report, Christian Kurtsiefer, Harald Weinfurter, Hugues De Riedmatten, Wolfgang Tittel, Hugo Zbinden, ...
This report summarises the ongoing work in QuComm on fiber based entanglement quantum cryptography. Report Version: 1 Report Preparation Date: 2002-01-05 Classification: Internal Project funded by...
Legre, Matthieu, Thew, Rob, Zbinden, Hugo, Gisin, Nicolas
We implement a photon-counting Optical Time Domain Reflectometer (OTDR) at 1.55um which exhibits a high 2-point resolution and a high accuracy. It is based on a low temporal-jitter photon-counting...
Phase noise measurements in long fiber interferometers for quantum repeaters applications (2007)
Minář, Jiří, De Riedmatten, Hugues, Simon, Christoph, Zbinden, Hugo, Gisin, Nicolas
Many protocols for long distance quantum communication require interferometric phase stability over long distances of optical fibers. In this paper we investigate the phase noise in long optical...
Jean-daniel Gautier, Jürgen Brendel, Hugo Zbinden, Nicolas Gisin, Bgn Bg
Time-of-flight chromatic dispersion measurement using photon counting.
High coherence photon pair source for quantum communication (2007)
Halder, Matthaeus, Beveratos, Alexios, Thew, Rob T, Jorel, Corentin, Zbinden, Hugo, Gisin, Nicolas
This paper reports a novel single mode source of narrow-band entangled photon pairs at telecom wavelengths under continuous wave excitation, based on parametric down conversion. For only 7 mW of pump...
Long-Distance Entanglement Distribution with Single-Photon Sources (2007)
Sangouard, Nicolas, Simon, Christoph, Minar, Jiri, Zbinden, Hugo, De Riedmatten, Hugues, Gisin, Nicolas
We present an efficient architecture for quantum repeaters based on single-photon sources in combination with quantum memories for photons. Errors inherent to previous repeater protocols using...
Entangling Independent Photons by Time Measurement (2007)
Halder, Matthaeus, Beveratos, Alexios, Gisin, Nicolas, Scarani, Valerio, Simon, Christoph, Zbinden, Hugo
A quantum system composed of two or more subsystems can be in an entangled state, i.e. a state in which the properties of the global system are well defined but the properties of each subsystem are...
Quantum Repeaters with Photon Pair Sources and Multi-Mode Memories (2007)
Simon, Christoph, De Riedmatten, Hugues, Afzelius, Mikael, Sangouard, Nicolas, Zbinden, Hugo, Gisin, Nicolas
We propose a quantum repeater protocol which builds on the well-known DLCZ protocol [L.M. Duan, M.D. Lukin, J.I. Cirac, and P. Zoller, Nature 414, 413 (2001)], but which uses photon pair sources in...
ASIC for High-Speed-Gating and Free Running Operation of SPADs (2007)
Rochas, Alexis, Guillaume-Gentil, Christophe, Gautier, Jean-Daniel, Pauchard, Alexandre, Ribordy, Gregoire;, Zbinden, Hugo, ...
Single photon detection at telecom wavelengths is of importance in many industrial applications ranging from quantum cryptography, quantum optics, optical time domain reflectometry, non-invasive...
Quantum teleportation over the Swisscom telecommunication network (2006)
Landry, Olivier, Beveratos, Alexios, Zbinden, Hugo, Gisin, Nicolas
We present a quantum teleportation experiment in the quantum relay configuration using the installed telecommunication network of Swisscom. In this experiment, the Bell state measurement occurs well...
Quantum superposition and entanglement of mesoscopic plasmons (2005)
Fasel, Sylvain, Halder, Matthaeus, Gisin, Nicolas, Zbinden, Hugo
Quantum superpositions and entanglement are at the heart of the quantum information science. There have been only a few investigations of these phenomena at the mesoscopic level, despite the fact...
Mid-Infrared Single Photon Counting (2005)
Temporao, Guilherme, Tanzilli, Sebastien, Zbinden, Hugo, Gisin, Nicolas, Aellen, Thierry, Giovannini, Marcella, ...
We report a procedure to detect mid-infrared single photons at 4.65 um via a two-stage scheme based on Sum Frequency Generation, using a Periodically Poled Lithium Niobate (PPLN) nonlinear crystal...
Legre, Matthieu, Zbinden, Hugo, Gisin, Nicolas
We demonstrate an implementation of quantum key distribution with continuous variables based on a go-&-return configuration over distances up to 14km. This configuration leads to self-compensation of...
A photonic quantum information interface (2005)
Tanzilli, Sebastien, Tittel, Wolfgang, Halder, Matthaeus, Alibart, Olivier, Baldi, Pascal, Gisin, Nicolas, ...
Quantum communication is the art of transferring quantum states, or quantum bits of information (qubits), from one place to another. On the fundamental side, this allows one to distribute...
Fast and simple one-way Quantum Key Distribution (2005)
Stucki, Damien, Brunner, Nicolas, Gisin, Nicolas, Scarani, Valerio, Zbinden, Hugo
We present and demonstrate a new protocol for practical quantum cryptography, tailored for an implementation with weak coherent pulses to obtain a high key generation rate. The key is obtained by a...
A Fabry-Perot like two-photon interferometer for high-dimensional time-bin entanglement (2005)
Stucki, Damien, Zbinden, Hugo, Gisin, Nicolas
We generate high-dimensional time-bin entanglement using a mode-locked laser and analyze it with a 2-photon Fabry-Perot interferometer. The dimension of the entangled state is limited only by the...
Towards practical and fast Quantum Cryptography (2004)
Gisin, Nicolas, Ribordy, Gregoire, Zbinden, Hugo, Stucki, Damien, Brunner, Nicolas, Scarani, Valerio
We present a new protocol for practical quantum cryptography, tailored for an implementation with weak coherent pulses. The key is obtained by a very simple time-of-arrival measurement on the data...
Energy-time entanglement preservation in plasmon-assisted light transmission (2004)
Fasel, Sylvain, Gisin, Nicolas, Zbinden, Hugo, Erni, Daniel, Moreno, Esteban, Robin, Frank
We report on experimental evidences of the preservation of energy-time entanglement for extraordinary plasmonic light transmission through sub-wavelength metallic hole arrays, and for long range...
High quality asynchronous heralded single photon source at telecom wavelength (2004)
Fasel, Sylvain, Alibart, Olivier, Beveratos, Alexios, Tanzilli, Sebastien, Zbinden, Hugo, Baldi, Pascal, ...
We report on the experimental realization and characterization of an asynchronous heralded single photon source based on spontaneous parametric down conversion. Photons at 1550nm are heralded as...
Four-photon correction in two-photon Bell experiments (2004)
Scarani, Valerio, De Riedmatten, Hugues, Marcikic, Ivan, Zbinden, Hugo, Gisin, Nicolas
Correlated photons produced by spontaneous parametric down-conversion are an essential tool for quantum communication, especially suited for long-distance connections. To have a reasonable count rate...
Fasel, Sylvain, Gisin, Nicolas, Ribordy, Grégoire, Zbinden, Hugo
We present a full implementation of a quantum key distribution system using energy-time entangled photon pairs and functioning with a 30km standard telecom fiber quantum channel. Two bases of two...
De Riedmatten, Hugues, Scarani, Valerio, Marcikic, Ivan, Acin, Antonio, Tittel, Wolfgang, Zbinden, Hugo, ...
We study the physics of four-photon states generated in spontaneous parametric down-conversion with a pulsed pump field. In the limit where the coherence time of the photons t_c is much shorter than...
Tailoring photonic entanglement in high-dimensional Hilbert spaces (2003)
De Riedmatten, Hugues, Marcikic, Ivan, Scarani, Valerio, Tittel, Wolfgang, Zbinden, Hugo, Gisin, Nicolas
We present an experiment where two photonic systems of arbitrary dimensions can be entangled. The method is based on spontaneous parametric down conversion with trains of d pump pulses with a fixed...
Stefanov, Andre, Zbinden, Hugo, Suarez, Antoine, Gisin, Nicolas
We present an experiment testing quantum correlations with frequency shifted photons. We test Bell inequality with 2-photon interferometry where we replace the beamsplitters by acousto-optic...
Femtosecond Time-Bin Entangled Qubits for Quantum Communication (2002)
Marcikic, Ivan, De Riedmatten, Hugues, Tittel, Wolfgang, Scarani, Valerio, Zbinden, Hugo, Gisin, Nicolas
We create pairs of non-degenerate time-bin entangled photons at telecom wavelengths with ultra-short pump pulses. Entanglement is shown by performing Bell kind tests of the Franson type with...
Creating high dimensional time-bin entanglement using mode-locked lasers (2002)
De Riedmatten, Hugues, Marcikic, Ivan, Zbinden, Hugo, Gisin, Nicolas
We present a new scheme to generate high dimensional entanglement between two photonic systems. The idea is based on parametric down conversion with a sequence of pump pulses generated by a...
Quantum cloning with an optical fiber amplifier (2002)
Fasel, Sylvain, Gisin, Nicolas, Ribordy, Gregoire, Scarani, Valerio, Zbinden, Hugo
It has been shown theoretically that a light amplifier working on the physical principle of stimulated emission should achieve optimal quantum cloning of the polarization state of light. We...
Nicolas Gisin, Grégoire Ribordy, Wolfgang Tittel, Hugo Zbinden
Quantum cryptography could well be the first application of quantum mechanics at the individual quanta level. The very fast progress in both theory and experiments over the recent years are reviewed,...
Quantum correlations versus Multisimultaneity: an experimental test (2001)
Stefanov, Andre, Gisin, Nicolas, Suarez, Antoine, Zbinden, Hugo
Multisimultaneity is a causal model of relativistic quantum physics which assigns a real time ordering to any set of events, much in the spirit of the pilot-wave picture. Contrary to standard quantum...
Photon counting for quantum key distribution with Peltier cooled InGaAs/InP APD's (2001)
Stucki, Damien, Ribordy, Grégoire, Stefanov, André, Zbinden, Hugo, Rarity, John G., Wall, Tom
The performance of three types of InGaAs/InP avalanche photodiodes is investigated for photon counting at 1550 nm in the temperature range of thermoelectric cooling. The best one yields a dark count...
Faint laser quantum key distribution: Eavesdropping exploiting multiphoton pulses (2001)
Felix, Stephane, Gisin, Nicolas, Stefanov, Andre, Zbinden, Hugo
The technological possibilities of a realistic eavesdropper are discussed. Two eavesdropping strategies taking profit of multiphoton pulses in faint laser QKD are presented. We conclude that, as long...
Gisin, Nicolas, Ribordy, Grégoire, Tittel, Wolfgang, Zbinden, Hugo
Quantum cryptography could well be the first application of quantum mechanics at the individual quanta level. The very fast progress in both theory and experiments over the recent years are reviewed,...
Nicolas Gisin Gre, Nicolas Gisin, Grégoire Ribordy, Wolfgang Tittel, Hugo Zbinden
This paper will show that in compensation for this "quantum noise," quantum mechanics allows us novel forms of coding without analogue in communication channels adequately described by...
Long distance entanglement based quantum key distribution (2000)
Ribordy, Gregoire, Brendel, Juergen, Gautier, Jean-Daniel, Gisin, Nicolas, Zbinden, Hugo
A detailled analysis of quantum key distribution employing entangled states is presented. We tested a system based on photon pairs entangled in energy-time optimized for long distance transmission....
The speed of quantum information and the preferred frame: analysis of experimental data (2000)
Scarani, Valerio, Tittel, Wolfgang, Zbinden, Hugo, Gisin, Nicolas
The results of EPR experiments performed in Geneva are analyzed in the frame of the cosmic microwave background radiation, generally considered as a good candidate for playing the role of preferred...
Optical Quantum Random Number Generator (1999)
Stefanov, André, Gisin, Nicolas, Guinnard, Olivier, Guinnard, Laurent, Zbinden, Hugo
A physical random number generator based on the intrinsic randomness of quantum mechanics is described. The random events are realized by the choice of single photons between the two outputs of a...
Fast and User-friendly Quantum Key Distribution (1999)
Ribordy, Gregoire, Gautier, Jean-Daniel, Gisin, Nicolas, Guinnard, Olivier, Zbinden, Hugo
Some guidelines for the comparison of different quantum key distribution experiments are proposed. An improved 'plug & play' interferometric system allowing fast key exchange is then introduced....
Testing the foundations of quantum mechanics (1999)
Quantum mechanics is certainly one of the most fascinating field of physics. In recent years, the new field of "quantum information processing" based on the most fundamental aspect of quantum...
Optical quantum random number generator (1999)
André Stefanov, Nicolas Gisin, Olivier Guinnard, Laurent Guinnard, Hugo Zbinden
A physical random number generator based on the intrinsic randomness of quantum mechanics is described. The random events are realized by the choice of single photons between the two outputs of a...
Automated plug and play quantum key distribution, Electron (1998)
Grégoire Ribordy, Jean-daniel Gautier, Nicolas Gisin, Olivier Guinnard, Hugo Zbinden
An improved « plug & play » interferometric system for quantum key distribution is presented. Self-alignment and compensation of birefringence remain, while limitations due to reflections are...
Optical excitation and spectroscopy of rare earth doped crystals and glasses / (1991)
Diss. Naturwiss. Bern (kein Austausch).