549 research outputs found
Strong Violations of Bell-type Inequalities for Path-Entangled Number States
We show that nonlocal correlation experiments on the two spatially separated
modes of a maximally path-entangled number state may be performed and lead to a
violation of a Clauser-Horne Bell inequality for any finite photon number N. We
present also an analytical expression for the two-mode Wigner function of a
maximally path-entangled number state and investigate a
Clauser-Horne-Shimony-Holt Bell inequality for such states. We test other
Bell-type inequalities. Some are violated by a constant amount for any N.Comment: 6 pages, LaTex; revised version accepted for publication in PR
The discourse structure of video games:A multimodal discourse semantics approach to game tutorials
The article proposes a multimodal discourse semantics approach to the analysis of video game tutorials that provides a discourse pragmatic analysis of the game canvases in these tutorials. The study mainly builds on linguistic approaches to formal dynamic discourse semantics that have already been successfully applied to other multimodal artefacts. The article will showcase the application of the resulting ‘logic of multimodal discourse interpretation’ to two specific cases of video game tutorials. This will outline particular discourse relations holding between events and segments in the tutorials as distinctive features of this video game genre and show the discursive patterns of these instructions
The information of high-dimensional time-bin encoded photons
We determine the shared information that can be extracted from time-bin
entangled photons using frame encoding. We consider photons generated by a
general down-conversion source and also model losses, dark counts and the
effects of multiple photons within each frame. Furthermore, we describe a
procedure for including other imperfections such as after-pulsing, detector
dead-times and jitter. The results are illustrated by deriving analytic
expressions for the maximum information that can be extracted from
high-dimensional time-bin entangled photons generated by a spontaneous
parametric down conversion. A key finding is that under realistic conditions
and using standard SPAD detectors one can still choose frame size so as to
extract over 10 bits per photon. These results are thus useful for experiments
on high-dimensional quantum-key distribution system.Comment: 18 pages, 6 figure
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