Author(s): Adam Nahum, Sagar Vijay, and Jeongwan Haah
A new analysis obtains hydrodynamic descriptions for the spreading of quantum information through many body-systems and for the “quantum butterfly effect.”
[Phys. Rev. X 8, 021014] Published Wed Apr 11, 2018
Author(s): Alex Krasnok, Denis G. Baranov, Andrey Generalov, Sergey Li, and Andrea Alù
A technique involving wave interference may improve the practicality of charging a phone wirelessly at some distance from the power source.
[Phys. Rev. Lett. 120, 143901] Published Mon Apr 02, 2018
Quantum emitters radiate light omni-directionally, making it hard to collect and use the generated photons. Here we propose a 3D metal-dielectric parabolic antenna surrounding an individual quantum dot as a source of collimated single photons which can then be easily extracted and manipulated. Our fabrication method relies on a single optically-induced polymerization step, once the selected emitter has been localized by confocal microscopy. Compared to conventional nano-antennas, our geometry does not require near-field coupling and it is therefore very robust against misalignment issues, and minimally affected by absorption in the metal. The parabolic antenna provides one of the largest reported experimental directivities (D=106) and the lowest beam divergences ({\Theta}=13.5 deg), a broadband operation over all the visible and near-IR range, together with more than 96% extraction efficiency, offering a practical advantage for quantum technological applications.
Focusing of light energy inside a scattering medium by controlling the time-gated multiple light scattering
Focusing of light energy inside a scattering medium by controlling the time-gated multiple light scattering, Published online: 26 March 2018; doi:10.1038/s41566-018-0120-9
The use of a time-gated reflection matrix of a scattering medium, in particular via using singular value decomposition and injecting light into the largest time-gated eigenchannel, can lead to a more than tenfold enhancement in light energy delivery in comparison with ordinary wave diffusion cases.
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Author(s): Midya Parto, Steffen Wittek, Hossein Hodaei, Gal Harari, Miguel A. Bandres, Jinhan Ren, Mikael C. Rechtsman, Mordechai Segev, Demetrios N. Christodoulides, and Mercedeh Khajavikhan
We report the first observation of lasing topological edge states in a 1D Su-Schrieffer-Heeger active array of microring resonators. We show that the judicious use of non-Hermiticity can promote single edge-mode lasing in such arrays. Our experimental and theoretical results demonstrate that, in the...
[Phys. Rev. Lett. 120, 113901] Published Thu Mar 15, 2018
Author(s): Michela F. Picardi, Anatoly V. Zayats, and Francisco J. Rodríguez-Fortuño
A proposed dipole source of electromagnetic waves can selectively couple its emission into either of two neighboring waveguides.
[Phys. Rev. Lett. 120, 117402] Published Thu Mar 15, 2018
Author(s): Semyon Chervinskii, Kalle Koskinen, Sergey Scherbak, Martti Kauranen, and Andrey Lipovskii
Second-harmonic generation from Au metal nanoislands is significantly enhanced by covering the nanoislands with a thin dielectric film of titanium dioxide.
[Phys. Rev. Lett. 120, 113902] Published Thu Mar 15, 2018
The undercover academic keeping tabs on ‘predatory’ publishing
The undercover academic keeping tabs on ‘predatory’ publishing, Published online: 16 March 2018; doi:10.1038/d41586-018-02921-2
Blacklists that warn against questionable publishers are in demand.Physical systems exhibiting topological invariants are naturally endowed with robustness against perturbations, as manifested in topological insulators—materials exhibiting robust electron transport, immune from scattering by defects and disorder. Recent years have witnessed intense efforts toward exploiting these phenomena in photonics. Here we demonstrate a nonmagnetic topological insulator laser system exhibiting topologically protected transport in the cavity. Its topological properties give rise to single-mode lasing, robustness against defects, and considerably higher slope efficiencies compared to the topologically trivial counterparts. We further exploit the properties of active topological platforms by assembling the system from S-chiral microresonators, enforcing predetermined unidirectional lasing without magnetic fields. This work paves the way toward active topological devices with exciting properties and functionalities.
Topological insulators are phases of matter characterized by topological edge states that propagate in a unidirectional manner that is robust to imperfections and disorder. These attributes make topological insulator systems ideal candidates for enabling applications in quantum computation and spintronics. We propose a concept that exploits topological effects in a unique way: the topological insulator laser. These are lasers whose lasing mode exhibits topologically protected transport without magnetic fields. The underlying topological properties lead to a highly efficient laser, robust to defects and disorder, with single-mode lasing even at very high gain values. The topological insulator laser alters current understanding of the interplay between disorder and lasing, and at the same time opens exciting possibilities in topological physics, such as topologically protected transport in systems with gain. On the technological side, the topological insulator laser provides a route to arrays of semiconductor lasers that operate as one single-mode high-power laser coupled efficiently into an output port.
Author(s): Maryam Landi, Jiajun Zhao, Wayne E. Prather, Ying Wu, and Likun Zhang
We observe that our experimentally measured emission power enhancement of a speaker inside a previously proposed metacavity agrees with our numerically calculated enhancement of the density of states (DOS) of the source-cavity system. We interpret the agreement by formulating a relation between the ...
[Phys. Rev. Lett. 120, 114301] Published Tue Mar 13, 2018
Network structure from rich but noisy data
Network structure from rich but noisy data, Published online: 12 March 2018; doi:10.1038/s41567-018-0076-1
A technique allows optimal inference of the structure of a network when the available observed data are rich but noisy, incomplete or otherwise unreliable.The ability to control multidimensional quantum systems is key for the investigation of fundamental science and for the development of advanced quantum technologies. We demonstrate a multidimensional integrated quantum photonic platform able to generate, control and analyze high-dimensional entanglement. A programmable bipartite entangled system is realized with dimension up to 15 x 15 on a large-scale silicon-photonics quantum circuit. The device integrates more than 550 photonic components on a single chip, including 16 identical photon-pair sources. We verify the high precision, generality and controllability of our multidimensional technology, and further exploit these abilities to demonstrate key quantum applications experimentally unexplored before, such as quantum randomness expansion and self-testing on multidimensional states. Our work provides an experimental platform for the development of multidimensional quantum technologies.