536 citations · 1.1k across the 17 of their papers we have counts for
17 papers
A genetic algorithm for the response of twisted nematic liquid crystals to an applied field
Alicia Sit, Francesco Di Colandrea, Alessio D'Errico +1
When an external field is applied across a liquid-crystal cell, the twist and tilt distributions cannot be calculated analytically and must be extracted numerically. In the standar…
Spatially twisted liquid-crystal devices
Alicia Sit, Francesco Di Colandrea, Alessio D'Errico +1
Nematic liquid-crystal devices are a powerful tool to structure light in different degrees of freedom, both in classical and quantum regimes. Most of these devices exploit either t…
Full spatial characterization of entangled structured photons
Xiaoqin Gao, Yingwen Zhang, Alessio D'Errico +3
Vector beams (VBs) are fully polarized beams with spatially varying polarization distributions, and they have found widespread use in numerous applications such as microscopy, metr…
Polychromatic Electric Field Knots
Manuel F. Ferrer-Garcia, Alessio D'Errico, Alicia Sit +2
The polarization of a monochromatic optical beam lies in a plane, and in general, is described by an ellipse, known as the polarization ellipse. The polarization ellipse in the tig…
Two-photon interference: the Hong-Ou-Mandel effect
FrédÉric Bouchard, Alicia Sit, Yingwen Zhang +5
Nearly 30 years ago, two-photon interference was observed, marking the beginning of a new quantum era. Indeed, two-photon interference has no classical analogue, giving it a distin…
Underwater quantum communication over a 30-meter flume tank
Felix Hufnagel, Alicia Sit, Frédéric Bouchard +5
Underwater quantum communication has recently been explored using polarization and orbital angular momentum. Here, we show that spatially structured modes, e.g., a coherent superpo…
Characterization of an underwater channel for quantum communications in the Ottawa River
Felix Hufnagel, Alicia Sit, Florence Grenapin +8
We examine the propagation of optical beams possessing different polarization states and spatial modes through the Ottawa River in Canada. A Shack-Hartmann wavefront sensor is used…
Orbital angular momentum and energy loss characterization of plasmonic excitations in metallic nanostructures in TEM
Matteo Zanfrognini, Enzo Rotunno, Stefano Frabboni +4
Recently, a new device to measure the Orbital Angular Momentum (OAM) electronic spectrum after elastic/inelastic scattering in a transmission electron microscope has been introduce…
Quantum process tomography of a high-dimensional quantum communication channel
Frédéric Bouchard, Felix Hufnagel, Dominik Koutný +5
The characterization of quantum processes, e.g. communication channels, is an essential ingredient for establishing quantum information systems. For quantum key distribution protoc…
Round-Robin Differential Phase-Shift Quantum Key Distribution with Twisted Photons
Frédéric Bouchard, Alicia Sit, Khabat Heshami +2
Quantum key distribution (QKD) offers the possibility for two individuals to communicate a securely encrypted message. From the time of its inception in 1984 by Bennett and Brassar…
Implementation of nearly arbitrary spatially-varying polarization transformations: a non-diffractive and non-interferometric approach using spatial light modulators
M. T. Runyon, C. H. Nacke, A. Sit +3
A fast and automated scheme for general polarization transformations holds great value in adaptive optics, quantum information, and virtually all applications involving light-matte…
Underwater Quantum Key Distribution in Outdoor Conditions with Twisted Photons
Frédéric Bouchard, Alicia Sit, Felix Hufnagel +8
Quantum communication has been successfully implemented in optical fibres and through free-space [1-3]. Fibre systems, though capable of fast key rates and low quantum bit error ra…
Interaction-Free Ghost-Imaging of Structured Objects
Yingwen Zhang, Alicia Sit, Frédéric Bouchard +6
Quantum - or classically correlated - light can be employed in various ways to improve resolution and measurement sensitivity. In an "interaction-free" measurement, a single photon…
General Lossless Spatial Polarization Transformations
Alicia Sit, Lambert Giner, Ebrahim Karimi +1
Liquid crystals allow for the real-time control of the polarization of light. We describe and provide some experimental examples of the types of general polarization transformation…
Nondestructive Measurement of Orbital Angular Momentum for an Electron Beam
Hugo Larocque, Frédéric Bouchard, Vincenzo Grillo +6
Free electrons with a helical phase front, referred to as "twisted" electrons, possess an orbital angular momentum (OAM) and, hence, a quantized magnetic dipole moment along their…
High-Dimensional Intra-City Quantum Cryptography with Structured Photons
Alicia Sit, Frédéric Bouchard, Robert Fickler +11
Quantum key distribution (QKD) promises information-theoretically secure communication, and is already on the verge of commercialization. Thus far, different QKD protocols have bee…
Realization of electron vortices with large orbital angular momentum using miniature holograms fabricated by electron beam lithography
E. Mafakheri, A. H. Tavabi, P. -H. Lu +9
Free electron beams that carry high values of orbital angular momentum (OAM) possess large magnetic moments along the propagation direction. This makes them an ideal probe for meas…