| Correction | Top |  |  |  | Anderson localization: The role of quantum symmetries p352 doi:10.1038/nphoton.2013.115
|  | Review | Top |  |  |  | Space-division multiplexing in optical fibres pp354 - 362 D. J. Richardson, J. M. Fini and L. E. Nelson doi:10.1038/nphoton.2013.94 This Review summarizes the simultaneous transmission of several independent spatial channels of light along optical fibres to expand the data-carrying capacity of optical communications. Recent results achieved in both multicore and multimode optical fibres are documented.
|  | Letters | Top |  |  |  | Spectral compression of single photons pp363 - 366 J. Lavoie, J. M. Donohue, L. G. Wright, A. Fedrizzi and K. J. Resch doi:10.1038/nphoton.2013.47 Researchers demonstrate bandwidth compression of single photons from 1740 GHz to 43 GHz, and tuning the center wavelength from 379 nm to 402 nm. The scheme relies on sum-frequency generation with frequency-chirped laser pulses. This technique enables interfacing between different quantum systems whose absorption and emission spectral properties are mismatched.
See also: News and Views by Eisaman |  |  |  | Plasmonic nano-protractor based on polarization spectro-tomography pp367 - 372 Farbod Shafiei, Chihhui Wu, Yanwen Wu, Alexander B. Khanikaev, Patrick Putzke, Akshay Singh, Xiaoqin Li and Gennady Shvets doi:10.1038/nphoton.2013.68 A three-dimensional spectroscopic sensor is demonstrated that uses a polarization-resolved scattering technique to determine the location and orientation of small particles. It exploits strong Fano resonance between a pair of particles, one barely visible and another that is relatively bright, to obtain nanoscale orientation information.
|  |  |  | A quantum logic gate between a solid-state quantum bit and a photon pp373 - 377 Hyochul Kim, Ranojoy Bose, Thomas C. Shen, Glenn S. Solomon and Edo Waks doi:10.1038/nphoton.2013.48 Researchers realize a quantum logic gate by performing all-optical coherent control of the exciton states of an InAs quantum dot in a photonic crystal cavity in the strong-coupling regime. Their demonstrations represent an important step towards realizing robust and scalable quantum networks and generating strong photon-photon interactions.
|  |  |  | Experimental demonstration of long-distance continuous-variable quantum key distribution pp378 - 381 Paul Jouguet, Sébastien Kunz-Jacques, Anthony Leverrier, Philippe Grangier and Eleni Diamanti doi:10.1038/nphoton.2013.63 Researchers demonstrate continuous-variable quantum key distribution over 80 km of optical fibre. They develop a detection system based on homodyne detectors to achieve an unprecedented level of stability and implement new codes tailored to perform secure communication optimally in a range of signal-to-noise ratios corresponding to long distances.
See also: News and Views by Lam & Ralph |  |  |  | Air-to-ground quantum communication pp382 - 386 Sebastian Nauerth, Florian Moll, Markus Rau, Christian Fuchs, Joachim Horwath, Stefan Frick and Harald Weinfurter doi:10.1038/nphoton.2013.46 Researchers demonstrate the feasibility of BB84 quantum key distribution between a plane and a ground station. Establishing a stable, low-noise quantum communication channel with the plane moving at 290 km/h over a distance of 20 km (4 mrad s-1), the results are representative for typical communication links to satellites.
|  | Articles | Top |  |  |  | Direct and full-scale experimental verifications towards ground-satellite quantum key distribution pp387 - 393 Jian-Yu Wang, Bin Yang, Sheng-Kai Liao, Liang Zhang, Qi Shen, Xiao-Fang Hu, Jin-Cai Wu, Shi-Ji Yang, Hao Jiang, Yan-Lin Tang, Bo Zhong, Hao Liang, Wei-Yue Liu, Yi-Hua Hu, Yong-Mei Huang, Bo Qi, Ji-Gang Ren, Ge-Sheng Pan, Juan Yin, Jian-Jun Jia, Yu-Ao Chen, Kai Chen, Cheng-Zhi Peng and Jian-Wei Pan doi:10.1038/nphoton.2013.89 Full-scale verifications for establishing quantum cryptography communication via satellites are reported. Three independent experiments using a hot-air balloon are performed: on a rapidly moving platform over a distance of 40 km, on a floating platform over a distance of 20 km, and over 96 km in air with a huge loss.
|  |  |  | Damping pathways of mid-infrared plasmons in graphene nanostructures pp394 - 399 Hugen Yan, Tony Low, Wenjuan Zhu, Yanqing Wu, Marcus Freitag, Xuesong Li, Francisco Guinea, Phaedon Avouris and Fengnian Xia doi:10.1038/nphoton.2013.57 Researchers clarify damping pathways for mid-infrared graphene plasmons, including graphene intrinsic optical phonons and edge scattering. They also demonstrate the guiding of mid-infrared graphene plasmons in 50-nm-wide structures with an electromagnetic mode area of 10-3 μm2 and a propagation length of 200 nm.
See also: News and Views by Buljan et al. | Interview with Fengnian Xia |  |  |  | A polymer optoelectronic interface restores light sensitivity in blind rat retinas pp400 - 406 Diego Ghezzi, Maria Rosa Antognazza, Rita Maccarone, Sebastiano Bellani, Erica Lanzarini, Nicola Martino, Maurizio Mete, Grazia Pertile, Silvia Bisti, Guglielmo Lanzani and Fabio Benfenati doi:10.1038/nphoton.2013.34 The popular organic semiconductor P3HT, which is commonly used in polymer solar cells and photodetectors, is demonstrated to be able to act as a biocompatible optoelectronic interface for the retina of blind rats.
|  |  |  | High-efficiency quantum-dot light-emitting devices with enhanced charge injection pp407 - 412 Benjamin S. Mashford, Matthew Stevenson, Zoran Popovic, Charles Hamilton, Zhaoqun Zhou, Craig Breen, Jonathan Steckel, Vladimir Bulovic, Moungi Bawendi, Seth Coe-Sullivan and Peter T. Kazlas doi:10.1038/nphoton.2013.70 Red quantum-dot light-emitting diodes with an external quantum efficiency of 18%, close to the theoretical maximum of 20%, are reported. Using a layer of zinc oxide nanocrystals provides highly effective electron transport, resulting in devices with a low operating voltage and a high luminous power efficiency of 25 lm W-1.
|  |  |  | Mesoscopic light transport by very strong collective multiple scattering in nanowire mats pp413 - 418 Tom Strudley, Tilman Zehender, Claire Blejean, Erik P. A. M. Bakkers and Otto L. Muskens doi:10.1038/nphoton.2013.62 Researchers report that light flow is strongly affected by mesoscopic interference in semiconducting nanowire mats in which the scattering length is much shorter than the wavelength of light. By measuring intensity distributions, fluctuations and correlations, they obtain evidence of low conductance and signatures of the onset of Anderson localization.
|  | Corrigendum | Top |  |  |  | Marker-free phase nanoscopy p418 Yann Cotte, Fatih Toy, Pascal Jourdain, Nicolas Pavillon, Daniel Boss, Pierre Magistretti, Pierre Marquet and Christian Depeursinge doi:10.1038/nphoton.2013.116
|  | Interview | Top |  |  |  | Graphene versus metal plasmons p420 Interview with Fengnian Xia doi:10.1038/nphoton.2013.111 Although there is much debate regarding whether graphene is more suitable than metals for use in plasmonics, the useful operational frequency ranges of these materials are complementary. Nature Photonics spoke with Fengnian Xia about his team's recent work on graphene plasmonics.
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