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Atomic, Mesoscopic and Optical Physics

AMOP Group

Studying at Cambridge


Current AMOP Seminars



Usually held on Mondays at 3.30pm in the Ryle seminar room 930


16.10.17 Prof. Alain Aspect  

Institut d'Optique Graduate School Université Paris-Saclay 

Hanbury Brown-Twiss, Hong-Ou-Mandel, and other landmarks in quantum optics : from photons to atoms

The second quantum revolution is based on entanglement, discovered by Einstein and Schrödinger in 1935. Its extraordinary character has been experimentally demonstrated by landmark experiments in quantum optics.  

At Institut d'Optique, we are currently revisiting these landmarks using atoms instead of photons, and after the observation of the atomic HOM effect1, we are progressing towards a test of Bell's inequalities with pairs of momentum entangled atoms2.

1. Lopes, R., Imanaliev, A., Aspect, A., Cheneau, M., Boiron, D., & Westbrook, C. I. (2015). Atomic Hong-Ou-Mandel experiment. Nature, 520(7545), 66-68.

2. Pierre Dussarrat, Maxime Perrier, Almazbek Imanaliev, Raphael Lopes, Alain Aspect, Marc Cheneau, Denis Boiron, and Christoph I. Westbrook: A two-particle, four-mode interferometer for atoms, arXiv 1707. 01279, to appear in Phys. Rev. Lett..


30.10.17 Dr. Eva-Maria Graefe 

Mathematical Physics Group, Faculty of Natural Sciences, Imperial College London

Evolution of Gaussian wave packets in the presence of losses and gains

In recent years there has been growing interest in open quantum systems described by non-Hermitian Hamiltonians in various fields. Examples are scattering systems and the effective description of absorption and amplification. The classical counterparts of non-Hermitian quantum systems, however, remained illusive. In this talk I present results on the quantum evolution of Gaussian wave packets generated by a non-Hermitian Hamiltonian in the semiclassical limit of small hbar. This yields a generalisation of the Ehrenfest theorem for the dynamics of observable expectation values. The resulting equations of motion for dynamical variables are coupled to an equation of motion for the phase-space metric - a phenomenon having no analogue in Hermitian theories. The insight that can be gained by this classical description will be demonstrated for a number of example systems.


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