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Quantum technologies

Dieter Meschede's research group

Quantum technologies with single neutral atoms

Awarded ERC Advanced Grant 2011

Big surprise: Dieter Meschede and Reinhard Werner from Hannover won an ERC Advanced Grant 2011. This opens great perspectives for research over next 5 years. Let's celebrate this success!

 

Cavity QED

alt In our experiment we couple single neutral cesium atoms to the field of a high finesse optical resonator. Single photons can be stored for a long time between the mirrors of our resonator: A single photon is reflected 300,000 times on average before it gets lost! Moreover, the confinement of the electric field to a small volume results in a high atom-cavity coupling strength, i.e. the rate of coherent energy exchange between atoms and the cavity field. A possible goal is to couple several atoms via the cavity field and to create correlated (e.g. entangled) atomic states. If you are interested in a master or diploma project download our flyer. For open PhD positions have a look at the right side of this page.

Read more about our recent work:

Introduction

Quantum Jumps

EIT
 

 

Few-atom quantum systems

Fig. 1: The vacuum cell with lattice and imaging system: Individual cesium atoms can be trapped and observed.

Our team is working on quantum information processing using a small number of Cesium atoms. We load the atoms into a 1D optical lattice and use the spin of each atom as a quantum bit, with the ability to set and read out each atom individually - a quantum register. Our lattice uses a special wavelength which makes the optical potential state-depedent, giving us the ability to shift atoms in the lattice depending on their internal state. We are currently researching the phenomena exhibited by a single atom when it is coherently separated over several sites. Ultimately, our goal is the controlled interaction of two atoms, creating entanglement that can be used in a quantum computation.

Read more about our recent results:

 

Optical microfibres

   altOptical microfibres are one of the current "hot" topics in photonics. Due to their extremely small diameter, a significant part of light propagates outside the fibre, as the evanescent field open to interaction with the surrounding medium. This effect is accompanied by extremely tight confinement of light, and provides ideal conditions for enhanced light-matter interaction experiments. Click here for an overview on optical microfibres, download our flyer for a list of open positions or read more about our current research topics: interferometric sensing and control of organic molecules.


 

Last Updated ( Friday, 12 November 2010 08:36 )