Participants in the QGates Network

Laboratoire Charles Fabry de l'Institut d'Optique

Team leader

Dr. Philippe Grangier

Note. This participant is part of a UMR including two other bodies, the Institut d'Optique, Orsay, France and the Universite de Paris Sud.

Expertise and experience of the participating organisation

During the last decade, the group has performed key experiments in the field of quantum non-demolition (QND), including the world record for the most efficient QND measurement in optics. Theoretical papers on QND measurements include a set of quantitative criteria for QND measurements, which is now widely used in the quantum optics community. The group has also been working on quantum noise in laser diodes, demonstrating the crucial importance of longitudinal and transverse modes in the noise properties of laser diodes.

More recently, and within the FET/QIPC program, the group realized several experiments directly related to quantum information processing: trapping individual neutral atoms in microscopic dipole traps, producing single photons from the pulsed fluorescence of single NV centers in diamond nanocrystals, and developing novel quantum cryptography protocols based upon quantum continuous variables.

The Institut d'Optique has very good mechanical, optical and electronics facilities. This enables the group to design and realise specific parts for the experiments.

Relevant recent publications

  • Ph. Grangier, J.-A. Levenson, & J.-Ph. Poizat, Quantum non-demolition mesurements in optics, Nature 396, 537 (1998).
  • A.M. van der Lee, N. J. van Druten, M. P. van Exter, J. P. Woerdman, J.-Ph. Poizat & Ph. Grangier, Critical Petermann K Factor for Intensity Noise Squeezing, Phys. Rev. Lett. 85, 4711 (2000); J.-Ph. Poizat & Ph. Grangier, Quantum noise of laser diodes, J. Mod. Optics, 47, 2842 (2000).
  • Ph. Grangier, G. Reymond & N. Schlosser, Implementations of quantum computing using cavity quantum electrodynamics schemes, Fortschritte der Physik (Progress of Physics) 48, 859 (2000); N. Schlosser, G. Reymond, I. Protsenko & Ph. Grangier, "Sub-poissonian loading of single atoms in a microscopic dipole trap, Nature 411, 1024 (2001).
  • A. Beveratos, R. Brouri, T. Gacoin, J.-Ph. Poizat & Ph. Grangier, Nonclassical radiation from diamond nanocrystals, Phys. Rev A 64, 061802-R (2001); ibid, Room-temperature stable single-photon source, Special issue of Eur. Phys. J. D (february 2002).
  • F. Grosshans & Ph. Grangier, Quantum cloning and teleportation criteria for continuous quantum variables, Phys. Rev. A 64, 010301-R (2001); ibid, Continuous variable quantum cryptography using coherent states, Phys. Rev. Lett. 88, 057902 (2002).

    Involvement in other EC projects

    The group has also a great deal of experience in European projects. In the last decade it has been involved in several European ESPRIT projects: NOROS 6934, QUINTEC 6934, ACQUIRE 20029, and in the FET / QIPC projects QUBITS, S4P and QUICOV. Dr. Philippe Grangier has been the coordinator of several EC Human Potential programmes, the "Non Classical Light" HCM network (1993-96) and the IHP Research Training Network "QUEST" (Quantum Entangled States of Trapped particles) (2000-2003).

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