Welcome to the website of the Quantum Photonics group.

We investigate the quantum interaction between light and nanophotonic semiconductor materials. Our quest is to develop methods to coherently control the coupling between photons and matter utilizing tailored nanophotonic structures such as photonic crystals. Current research topics include spontaneous emission of light from quantum dots in photonic crystals and plasmonic nanostructures, development of new single-photon sources for quantum information technology, and multiple scattering of quantum light.

News  

 

• Summer School on Quantum and Non-Linear Optics, August 22-28 2010

  The 5th Summer School on quantum and nonlinear optics (QNLO) welcomes students from all over the world. The objective of the summer school is to introduce the participants to modern and very hot topics of quantum and nonlinear optics with emphasis on quantum information and quantum metrology.The summer school will take place in August 22-28 2010 at the old castle, Sandbjerg Estate, in the beautiful settings of southern Denmark. Please click here for further information.

• Quantum plasmonics: quadrature-squeezed surface plasmons

  We investigate the generation, propagation, and re-emission of non-classical surface plasmon polaritons using a squeezed light source. Despite the interaction of light and electrons in the gold waveguide we prove by complete quantum tomographic reconstruction of the density matrix that the re-emitted quantum state exhibits non-classical character. Further theoretical and experimental details are published by A. Huck et al. in Physical Review Letters 102, 246802 (June 2009).

   

  

   

   

•  Photons know what other photons do after multiple scattering

   

  When light propagates through multiple scattering media such as clouds, white paint, or nano-photonic devices, classical information for example the direction of propagation tends to be lost. Surprisingly this turns out to be different for quantum light. Now, Stephan Smolka and co-workers published in Physical Review Letters 102, 193901 (May 2009) the experimantal demonstration that spatial quantum correlations are induced when quantum correlated light is sent through a multiple scattering medium. As a consequence, the number of photons scattered into one direction can be predicted from the number of photons detected in a different direction. The magnitude of the spatial quantum correlations could be controlled by changing the quantum state of light incident on the medium.

  

   

   

•  A broadband single-photon source

  The paper "Experimental Realization of Highly Efficient Broadband Coupling of Single Quantum Dots to a Photonic Crystal Waveguide" by Toke Lund-Hansen et al. is published in September 12 (2008) issue of Physical Review Letters. For more information check out the PhysOrg coverage or read our paper.