Matthieu Legre

High resolution optical time domain reflectometer based on 1.55um up-conversion photon-counting module (2008)

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...

Implementation of continuous variable quantum cryptography in optical fibres using a go-&-return configuration (2005)

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...

Direct measurement of superluminal group velocity and of signal velocity in an optical fiber (2004)

Brunner, Nicolas, Scarani, Valerio, Wegmuller, Mark, Legre, Matthieu, Gisin, Nicolas

We present an easy way of observing superluminal group velocities using a birefringent optical fiber and other standard devices. In the theoretical analysis, we show that the optical properties of...

Experimental investigation of a coherent quantum measurement of the degree of polarization of a single mode light beam (2002)

Legre, Matthieu, Wegmuller, Mark, Gisin, Nicolas

A novel method for the direct measurement of the degree of polarization is described. It is one of the first practical implementations of a coherent quantum measurement, the projection on the singlet...