Xavier, G. B., Walenta, N., De Faria, G. Vilela, Temporao, G. P., Gisin, N., Zbinden, H., ...
In this paper we demonstrate an active polarization drift compensation scheme for optical fibres employed in a quantum key distribution experiment with polarization encoded qubits. The quantum...
High rate, long-distance quantum key distribution over 250km of ultra low loss fibres (2009)
Stucki, D., Walenta, N., Vannel, F., Thew, R. T., Gisin, N., Zbinden, H., ...
We present a fully automated quantum key distribution prototype running at 625 MHz clock rate. Taking advantage of ultra low loss fibres and low-noise superconducting detectors, we can distribute...
The SECOQC quantum key distribution network in Vienna (2009)
Peev, M., Pacher, C., Alleaume, R., Barreiro, C., Bouda, J., Boxleitner, W., ...
Highly efficient photon-pair source using a Periodically Poled Lithium Niobate waveguide (2008)
S. Tanzilli, H. De Riedmatten, W. Tittel, H. Zbinden, P. Baldi, M. De Micheli, ...
We report on a new kind of correlated photon-pair source based on a
Reply to the "Comment on: Testing the speed of 'spooky action at a distance' " (2008)
Salart, D., Baas, A., Branciard, C., Gisin, N., Zbinden, H.
This is the reply to the comment arXiv:0810.4452 by Kofler, Ursin, Brukner, and Zeilinger.
Testing spooky action at a distance (2008)
Salart, D., Baas, A., Branciard, C., Gisin, N., Zbinden, H.
In science, one observes correlations and invents theoretical models that describe them. In all sciences, besides quantum physics, all correlations are described by either of two mechanisms. Either a...
Tunable Up-Conversion Photon Detector (2008)
Thew, R. T., Zbinden, H., Gisin, N.
We introduce a simple approach for a tunable up-conversion detector. This scheme is relevant for both single photon detection or anywhere where low light levels at telecom wavelengths need to be...
Approaches to Single Photon Detection (2008)
Thew, R. T., Curtz, N., Eraerds, P., Walenta, N., Gautier, J-D., Koller, E., ...
We present recent results on our development of single photon detectors, including: gated and free-running InGaAs/InP avalanche photodiodes; hybrid detection systems based on sum-frequency generation...
Space-like Separation in a Bell Test assuming Gravitationally Induced Collapses (2008)
Salart, D., Baas, A., Gisin, N., Zbinden, H.
We report on a Bell experiment with space-like separation assuming that the measurement time is related to gravity-induced state reduction. Two energy-time entangled photons are sent through optical...
Thew, R. T., Stucki, D., Gautier, J-D., Rochas, A., Zbinden, H.
We present an InGaAs/InP avalanche photodiode with an active quenching circuit on an ASIC (application specific integrated circuit) that is capable of operating in both gated and free-running modes....
SiPM used as fast Photon-Counting Module and for Multiphoton Detection (2007)
Eraerds, P., Legre, M., Rochas, A., Zbinden, H., Gisin, N.
We demonstrate fast counting and multiphoton detection abilities of a Silicon Photo Multiplier (SiPM). In fast counting mode we are able to detect two consecutive photons separated by only 2.3 ns...
PPLN Waveguide for Quantum Communication (2006)
Tanzilli, S., De Riedmatten, H., Tittel, W., Zbinden, H., Baldi, P., De Micheli, M., ...
We report on energy-time and time-bin entangled photon-pair sources based on a periodically poled lithium niobate (PPLN) waveguide. Degenerate twin photons at 1314 nm wavelength are created by...
Experimental Quantum Teleportation with a 3-Bell-state Analyzer (2006)
Beveratos, A., Brunner, N., Gisin, N., Zbinden, H.
We present a Bell-state analyzer for time-bin qubits allowing the detection of three out of four Bell-states with linear optics, two detectors and no auxiliary photons. The theoretical success rate...
GHz QKD at telecom wavelengths using up-conversion detectors (2005)
Thew, R. T., Tanzilli, S., Krainer, L., Zeller, S. C., Rochas, A., Rech, I., ...
We have developed a hybrid single photon detection scheme for telecom wavelengths based on nonlinear sum-frequency generation and silicon single-photon avalanche diodes (SPADs). The SPAD devices...
Quantum Teleportation with a 3-Bell-state Analyzer (2005)
Brunner, N., Beveratos, A., Zbinden, H., Gisin, N.
We present a novel Bell-state analyzer for time-bin qubits allowing the detection of three out of four Bell-states with linear optics, only two detectors and no auxiliary photons. The theoretical...
Trojan Horse attacks on Quantum Key Distribution systems (2005)
Gisin, N., Fasel, S., Kraus, B., Zbinden, H., Ribordy, G.
General Trojan horse attacks on quantum key distribution systems are analyzed. We illustrate the power of such attacks with today's technology and conclude that all system must implement active...
Energy-time entangled qutrits: Bell tests and quantum communication (2004)
Thew, R. T., Tanzilli, S., Acin, A., Zbinden, H., Gisin, N.
We have developed a scheme to generate, control, transmit and measure entangled photonic qutrits (two photons each of dimension d = 3). A Bell test of this source has previously been reported...
Long distance entanglement swapping with photons from separated sources (2004)
De Riedmatten, H., Marcikic, I., Tittel, W., Zbinden, H., Gisin, N.
We report the first experimental realization of entanglement swapping over large distances in optical fibers. Two photons separated by more than two km of optical fibers are entangled, although they...
Photon-bunching measurement after 2x25km of standard optical fibers (2004)
Halder, M., Tanzilli, S., De Riedmatten, H., Beveratos, A., Zbinden, H., Gisin, N.
To show the feasibility of a long distance partial Bell-State measurement, a Hong-Ou-Mandel experiment with coherent photons is reported. Pairs of degenerate photons at telecom wavelength are created...
Distribution of time-bin qubits over 50 km of optical fiber (2004)
Marcikic, I., De Riedmatten, H., Tittel, W., Zbinden, H., Legre, M., Gisin, N.
We report experimental distribution of time-bin entangled qubits over 50 km of optical fibers. Using actively stabilized preparation and measurement devices we demonstrate violation of the CHSH Bell...
A Bell-type test of energy-time entangled qutrits (2004)
Thew, R. T., Acin, A., Zbinden, H., Gisin, N.
We have performed a Bell-type test for energy-time entangled qutrits. A method of inferring the Bell violation in terms of an associated interference visibility is derived. Using this scheme we...
Long distance quantum teleportation in a quantum relay configuration (2003)
De Riedmatten, H., Marcikic, I., Tittel, W., Zbinden, H., Collins, D., Gisin, N.
A long distance quantum teleportation experiment with a fiber-delayed Bell State Measurement (BSM) is reported. The source creating the qubits to be teleported and the source creating the necessary...
Experimental realization of entangled qutrits for quantum communication (2003)
Thew, R. T., Acin, A., Zbinden, H., Gisin, N.
We have experimentally realized a technique to generate, control and measure entangled qutrits, 3-dimensional quantum systems. This scheme uses spontaneous parametric down converted photons and...
Marcikic, I., De Riedmatten, H., Tittel, W., Zbinden, H., Gisin, N.
Elementary 2-dimensional quantum states (qubits) encoded in 1300 nm wavelength photons are teleported onto 1550 nm photons. The use of telecommunication wavelengths enables to take advantage of...
Gisin, N., Marcikic, I., De Riedmatten, H., Tittel, W., Zbinden, H.
Using 2 km of standard telecom optical fibres, we teleport qubits carried by photons of 1310 nm wavelength to qubits in another lab carried by a photons of 1550 nm wavelength. The photons to be...
Quantum interference with photon pairs created in spatially separated sources (2002)
De Riedmatten, H., Marcikic, I., Tittel, W., Zbinden, H., Gisin, N.
We report on a quantum interference experiment to probe the coherence between two photons coming from non degenerate photon pairs at telecom wavelength created in spatially separated sources. The two...
Quantum Key Distribution over 67 km with a plug & play system (2002)
Stucki, D., Gisin, N., Guinnard, O., Ribordy, G., Zbinden, H.
We present a fibre-optical quantum key distribution system. It works at 1550nm and is based on the plug & play setup. We tested the stability under field conditions using aerial and terrestrial...
Experimental investigation of the robustness of partially entangled photons over 11km (2002)
Thew, R. T., Tanzilli, S., Tittel, W., Zbinden, H., Gisin, N.
We experimentally investigate the robustness of maximal and non-maximal Time-Bin entangled photons over distances up to 11 km. The entanglement is determined by controllable parameters and in all...
PPLN Waveguide for Quantum Communication (2001)
Tanzilli, S., De Riedmatten, H., Tittel, W., Zbinden, H., Baldi, P., De Micheli, M., ...
We report on energy-time and time-bin entangled photon-pair sources based on a periodically poled lithium niobate (PPLN) waveguide. Degenerate twin photons at 1314 nm wavelength are created by...
Highly efficient photon-pair source using a Periodically Poled Lithium Niobate Waveguide (2000)
Tanzilli, S., De Riedmatten, H., Tittel, W., Zbinden, H., Baldi, P., De Micheli, M., ...
We report on a new kind of correlated photon-pair source based on a waveguide integrated on a Periodically Poled Lithium Niobate substrate. Using a pump laser of a few micro-Watts at 657 nm, we...
Gisin, N., Scarani, V., Tittel, W., Zbinden, H.
Past, present and future experimental tests of quantum nonlocality are discussed. Consequences of assuming that the state-vector collapse is a real physical phenomenon in space-time are developed....
Experimental test of non-local quantum correlation in relativistic configurations (2000)
Zbinden, H., Brendel, J., Gisin, N., Tittel, W.
We report on a new kind of experimental investigations of the tension between quantum nonlocally and relativity. Entangled photons are sent via an optical fiber network to two villages near Geneva,...
Experimental Test of Relativistic Quantum State Collapse with Moving Reference Frames (2000)
Zbinden, H., Brendel, J., Tittel, W., Gisin, N.
An experimental test of relativistic wave-packet collapse is presented. The tested model assumes that the collapse takes place in the reference frame determined by the massive measuring detectors....
Quantum secret sharing using pseudo-GHZ states (1999)
Tittel, W., Zbinden, H., Gisin, N.
We present a setup for quantum secret sharing using pseudo-GHZ states based on energy-time entanglement. In opposition to true GHZ states, our states do not enable GHZ-type tests of nonlocality,...
Quantum Cryptography using entangled photons in energy-time Bell states (1999)
Tittel, W., Brendel, J., Zbinden, H., Gisin, N.
We present a setup for quantum cryptography based on photon pairs in energy-time Bell states and show its feasability in a laboratory experiment. Our scheme combines the advantages of using photon...
Bell inequality and the locality loophole: Active versus passive switches (1999)
All experimental tests of the violation of Bell's inequality suffer from some loopholes. We show that the locality loophole is not independent of the detection loophole: in experiments using low...
Quantum cryptography and long distance Bell experiments: How to control decoherence (1999)
Gisin, N., Brendel, J., Gautier, J-D., Gisin, B., Huttner, B., Ribordy, G., ...
Several mechanisms that affect one and two photon coherence in optical fibers and their remedies are discussed. The results are illustrated on quantum cryptography experiments and on long distance...
Automated 'plug & play' quantum key distribution (1998)
Ribordy, G., Gisin, N., Guinnard, O., Zbinden, H.
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 overcome....
Pulsed energy-time entangled twin-photon source for quantum communication (1998)
Brendel, J., Gisin, N., Tittel, W., Zbinden, H.
A pulsed source of energy-time entangled photon pairs pumped by a standard laser diode is proposed and demonstrated. The basic states can be distinguished by their time of arrival. This greatly...
Long-distance Bell-type tests using energy-time entangled photons (1998)
Tittel, W., Brendel, J., Gisin, N., Zbinden, H.
Long-distance Bell-type experiments are presented. The different experimental challenges and their solutions in order to maintain the strong quantum correlations between energy-time entangled photons...
Twin-photon techniques for fiber measurements (1998)
Gisin, H., Brendel, J., Zbinden, H., Sergienko, A., Muller, A.
The potential of twin photons generated by parametric down-conversion for metrological applications are discussed. We present several experimental results like the measurement of chromatic dispersion...
Violation of Bell inequalities by photons more than 10 km apart (1998)
Tittel, W., Brendel, J., Zbinden, H., Gisin, N.
A Franson-type test of Bell inequalities by photons 10.9 km apart is presented. Energy-time entangled photon-pairs are measured using two-channel analyzers, leading to a violation of the inequalities...
Performance of InGaAs/InP avalanche photodiodes as gated-mode photon counters (1998)
G. Ribordy, J. D. Gautier, H. Zbinden, N. Gisin
We investigate the performance of separate absorption multiplication InGaAs/InP avalanche photodiodes as single photon detectors for 1.3 µm and 1.55 µm wavelengths. We study first afterpulses, and...
Experimental demonstration of quantum correlations over more than 10 km (1997)
Tittel, W., Brendel, J., Gisin, B., Herzog, T., Zbinden, H., Gisin, N.
Energy and time entangled photons at a wavelength of 1310 nm are produced by parametric downconversion in a KNbO3 crystal and are sent into all-fiber interferometers using a telecom fiber network....
Non-local two-photon correlations using interferometers physically separated by 35 meters (1997)
Tittel, W., Brendel, J., Herzog, T., Zbinden, H., Gisin, N.
An experimental demonstration of quantum correlations is presented. Energy and time entangled photons at wavelengths of 704 and 1310 nm are produced by parametric downconversion in KNbO3 and are sent...
Interferometry with Faraday mirrors for quantum cryptography (1997)
Zbinden, H., Gautier, J. D., Gisin, N., Huttner, B., Muller, A., Tittel, W.
Quantum Cryptography over 23km of installed Telecom fiber using a novel interferometer with Faraday mirrors is presented. The interferometer needs no alignment nor polarization control and features...
Plug and play systems for quantum cryptography (1997)
A. Muller, T. Herzog, B. Huttner, W. Tittel, H. Zbinden, N. Gisin
We present a time-multiplexed interferometer based on Faraday mirrors, and apply it to quantum key distribution. The interfering pulses follow exactly the same spatial path, ensuring very high...
``Plug and play'' systems for quantum cryptography (1996)
Muller, A., Herzog, T., Huttner, B., Tittel, W., Zbinden, H., Gisin, N.
We present a time-multiplexed interferometer based on Faraday mirrors, and apply it to quantum key distribution. The interfering pulses follow exactly the same spatial path, ensuring very high...
"Plug and play" systems for quantum cryptography (1996)
A. Müller, T. Herzog, B. Hüttner, W. Tittel, H. Zbinden, N. Gisin
We present a time-multiplexed interferometer based on Faraday mirrors, and apply it to quantum key distribution. The interfering pulses follow exactly the same spatial path, ensuring very high...