AtMol Research Seminar Archive
Index Current Seminars

Easter 2012

Date Speaker Institution
The Molecular Hubbard Hamiltonian
26th April Dr. Lincoln Carr Colorado School of Mines

No seminar (4th year vivas)
2nd May

Deterministic quantum memories and atom chips
9th May Dr. Thomas Fernholz University of Nottingham

In recent years, quantum memories based on atomic ensembles have been succesfully used to demonstrate a range of key features that are necessary to implement certain quantum communication protocols. One particular type of such memories, sometimes termed deterministic memories, use continuous variable measurements and feedback techniques to achieve a constant storage fidelity in every experimental run. The relevant techniques will be explained and some recent experimental results highlighted. In order to develop such memories into technologically relevant devices, our current work is aimed at integrating similar methods with fibre based microoptics and atomchips. Ideas for experimental realisations, potential benefits, and challenges will be discussed.

To be confirmed
16th May Prof. Vahid Sandoghdar Max Planck Institute for the Science of Light

Generation of Non-Classical Light from Collective Atomic Excitations
17th May Mr. Andrew Macrae University of Calgary

I will discuss our recent demonstration of efficient generation of narrow-bandwidth non-classical light in an atomic vapor cell. Using a four-wave mixing process we produce squeezed light as well as heralded single photons and coherent photon superpositions. Employing optical homodyne tomography we fully reconstruct the density matrix of the generated light and verify its non-classical character. Since the heralded states stem from a transient collective spin excitation in the atomic ensemble, this work opens a new possibility of engineering arbitrary superpositions of atomic collective spin excitations.

Graphene: Synthesis, Properties and Applications
23rd May Dr. Karl Coleman University of Durham

Graphene has generated much interest owing to its exceptional electronic properties and high mechanical strength. This has enabled new types of electronic devices and composite materials to be envisaged. The main problem is the availability of the material and the difficulties associated with its synthesis. In this talk I will introduce graphene and some of the potential applications and discuss how it can be prepared or isolated. I will also discuss the potential for large-scale synthesis of graphene that could allow many of the potential applications to be realised and present a simple and scalable method to produce few-layer graphene platelets. I will introduce some of our very latest work where we have gone on to try and control the shape or morphology of the graphene produced in a bid to exert control over properties. Finally, I will show how we have used graphene in composite materials and memory devices.

From Satellite Remote Sensing of the Earth to Non-Invasive Diagnostics of Skin Cancer
28th May Prof. Jakob Stamnes University of Bergen

Atom-Light Interactions in a Rydberg Blockaded Medium (1st Year Talk E(101))
6th June (1 PM) Mr. Tom Ogden University of Durham

A first year report on studies of light propagation through an ensemble of three-level ladder atoms, involving electromagnetically induced transparency and long-range dipole-dipole interaction between Rydberg states leading to blockade. Such systems provide a means of controlling interactions between photons in quantum information applications.

The Herschel Space Observatory: Exploring the Origins of Stars and Galaxies [Parsons Grubb Lecture (CLC 202)]
6th June (4:30 PM) Prof. Matt Griffin Cardiff University

Rubidium-85 Bright Soliton (1st Year Talk (E101))
13th June Mr. Manfred Yu University of Durham

I will discuss the creation of rubidium-85 Bose-Einstein Condensates via direct evaporation in a crossed-dipole trap. The precise control of the scattering properties using magnetic fields and trap frequencies has enabled us to perform efficient evaporative cooling in the vicinity of the 155G Feshbach resonance. The latest progress of making bright matter wave solitons by exploiting condensate collapse in the optical waveguide will also be discussed.

1st Year Talk (E101)
20th June Mr. Alfred Millet-Sikking University of Durham