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Publications of the Max Planck Institute for the Science of Light

2015

New self-dual additive F4-codes constructed from circulant graphs

Markus Grassl, Masaaki Harada

Discrete Mathematics 340 (3) 399-403 (2016) | Journal

In order to construct quantum [[n,0,d]] codes for (n,d)=(56,15), (57,15), (58,16), (63,16), (67,17), (70,18), (71,18), (79,19), (83,20), (87,20), (89,21), (95,20), we construct self-dual additive F4-codes of length n and minimum weight d from circulant graphs. The quantum codes with these parameters are constructed for the first time.

Strong, spectrally-tunable chirality in diffractive metasurfaces

Israel De Leon, Matthew J. Horton, Sebastian A. Schulz, Jeremy Upham, Peter Banzer, Robert W. Boyd

Scientific Reports 5 13034 (2015) | Journal

Metamaterials and metasurfaces provide a paradigm-changing approach for manipulating light. Their potential has been evinced by recent demonstrations of chiral responses much greater than those of natural materials. Here, we demonstrate theoretically and experimentally that the extrinsic chiral response of a metasurface can be dramatically enhanced by near-field diffraction effects. At the core of this phenomenon are lattice plasmon modes that respond selectively to the illumination’s polarization handedness. The metasurface exhibits sharp features in its circular dichroism spectra, which are tunable over a broad bandwidth by changing the illumination angle over a few degrees. Using this property, we demonstrate an ultra-thin circular-polarization sensitive spectral filter with a linewidth of ~10 nm, which can be dynamically tuned over a spectral range of 200 nm. Chiral diffractive metasurfaces, such as the one proposed here, open exciting possibilities for ultra-thin photonic devices with tunable, spin-controlled functionality.

Nano-Quantenoptik

Tobias Utikal, Emanuel Eichhammer, Benjamin Gmeiner, Andreas Maser, Daqing Wang, Pierre Türschmann, Hrishikesh Kelkar, Nir Rotenberg, Stephan Götzinger, et al.

MPG Jahrbuch 2015 (2015) | Journal

Nanoskopische Quantensysteme in einem Festkörper finden in der Quantenoptik zunehmend an Bedeutung. Deren Integrierbarkeit in photonische Nanostrukturen machen sie zu aussichtsreichen Kandidaten zur Realisierung von zukünftigen Quantennetzwerken. Als Grundbaustein konnte kürzlich die effiziente Kopplung von einzelnen Molekülen an photonische Wellenleiterstrukturen gezeigt werden. Mit neuartigen Mikroresonatoren ist es möglich, die optische Kopplung zwischen einzelnen Quantensystemen zu untersuchen. Unterdessen kommen sogar einzelne Ionen in einem Kristall in der Nano-Quantenoptik zum Einsatz.

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