In this review, we present recent advances relating to superconducting nanowire single-photon detectors (SSPDs or SNSPDs) and their broad range of applications. During a period exceeding ten years, the system performance of SSPDs has been drastically improved, and lately excellent detection efficiencies have been realized in practical systems for a wide range of target photon wavelengths. Owing...

We investigate the implementation of binary projective measurements with linear optics. This problem can be viewed as a single-shot discrimination of two orthogonal pure quantum states. We show that any two orthogonal states can be perfectly discriminated using only linear optics, photon counting, coherent ancillary states, and feedforward. The statement holds in the asymptotic limit of a large...

The outline of a recent approach to quantum gravity is presented. Novel ingredients include: (1) Affine kinematical variables; (2) Affine coherent states; (3) Projection operator approach toward quantum constraints; (4) Continuous-time regularized functional integral representation without/with constraints; and (5) Hard core picture of nonrenormalizability. The “diagonal representation” for ope...

they also facilitate completely new approaches, for instance in data processing. To better understand them, the team working with Immanuel Bloch, Director at the Max Planck Institute of Quantum Optics in Garching, is using atoms in optical lattices to simulate quantum matter. In doing so, they have repeatedly observed a behavior of matter that contradicts our everyday experience. Quantum Magic ...

1Max-Born-Institute for Nonlinear Optics and Ultrafast Spectroscopy, 2A Max-Born-Str., D-12489 Berlin, Germany, 2Special Technologies, Ltd., 1/3 Zeljonaja gorka Str., 630060 Novosibirsk, Russia, 3Research Laboratory of Quantum Optics Technology, Novosibirsk State University, 2 Pirogova Str., 630090 Novosibirsk, Russia, 4Department of Applied Physics, Royal Institute of Technology, 10691 Stockho...

We present conditions for the efficient simulation of a broad class of optical quantum circuits on a classical machine: this class includes unitary transformations, amplification, noise, and measurements. Various proposed schemes for universal quantum computation using optics are assessed against these conditions, and we consider the minimum resource requirements needed in any optical scheme to...

Johannes Handsteiner1,∗ Andrew S. Friedman2,† Dominik Rauch1, Jason Gallicchio3, Bo Liu1,4, Hannes Hosp1, Johannes Kofler5, David Bricher1, Matthias Fink1, Calvin Leung3, Anthony Mark2, Hien T. Nguyen6, Isabella Sanders2, Fabian Steinlechner1, Rupert Ursin1,7, Sören Wengerowsky1, Alan H. Guth2, David I. Kaiser2, Thomas Scheidl1, and Anton Zeilinger1,7‡ 1Institute for Quantum Optics and Quantum ...

Journal of Modern Optics Publication details, including instructions for authors and subscription information: http://www.informaworld.com/smpp/title~content=t713191304 Uncertainty relations for the realization of macroscopic quantum superpositions and EPR paradoxes E. G. Cavalcanti a; M. D. Reid a a ARC Centre for Excellence for Atom-Optics, School of Physical Sciences, The University of Queen...