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Quantum projection noise thesis

quantum projection noise thesis

report preliminary observations of collective atomic Bragg scattering in this extreme onedimensional geometry, in view to realize a switchable atomic mirror, Chang. Jean-Baptiste Bguin, a thesis submitted April 24, 2014 for the degree of Doctor of Philosophy and defended May 15, 2015.

We then pursued the goal of generating other non-classical collective states of atoms with non-gaussian statistics, conditioned on discrete heralding optical measurement, Christensen. Many features of the quantum world (e. This shows the ability to explore spin-squeezing and quantum state tomography of non-classical states with negative Wigner functions, using a nanofiber. We build and explore a new interface based on the degrees of freedom between the evanescent fields of an optical nanofiber and fewer atoms Nat _ 103.

This was achieved in the past in a free space optical dipole trap ensemble what is your ambition essay of Nat _ 106 atoms, which triggered the operation of a collective Ramsey atomic clock assisted by entanglement Appel. (2009b Louchet-Chauvet. Quantum interfaces between light and the collective degrees of freedom of an ensemble of identical atoms have been proposed as a valuable and promising alternative to cavity quantum electrodynamics enhanced interaction with single particles, Hammerer. We have characterized and prepared non-classical collective spin-squeezed states of atoms in this setup, with optical quantum non demolition measurement, Kiesel. We experimentally show an improvement of more than 2 orders of magnitude in the single-atom coupling strength and we demonstrate a simple method to implement an optical non-destructive measurement of the atomic state populations, which allowed to achieve 14 dB atom number squeezing,. In the main part of this thesis, we propose an alternative to free space atomic ensembles to prepare quantum collective states.

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