368 research outputs found
Efficient high-dimensional entanglement imaging with a compressive sensing, double-pixel camera
We implement a double-pixel, compressive sensing camera to efficiently
characterize, at high resolution, the spatially entangled fields produced by
spontaneous parametric downconversion. This technique leverages sparsity in
spatial correlations between entangled photons to improve acquisition times
over raster-scanning by a scaling factor up to n^2/log(n) for n-dimensional
images. We image at resolutions up to 1024 dimensions per detector and
demonstrate a channel capacity of 8.4 bits per photon. By comparing the
classical mutual information in conjugate bases, we violate an entropic
Einstein-Podolsky-Rosen separability criterion for all measured resolutions.
More broadly, our result indicates compressive sensing can be especially
effective for higher-order measurements on correlated systems.Comment: 10 pages, 7 figure
The Role of an Internal Audit in Credit Union Financial Decision Making
The purpose of this paper is to show how an internal audit can be used in credit union financial decision making.
The paper analyzes in depth the kinds of data obtainable from an internal audit and the kinds of data required for credit union financial decision making. By utilizing a comparative analysis of the compatability of the two types of data, the paper shows how the data obtainable from an internal audit can be applied to credit union financial decision making
Compressive Wavefront Sensing with Weak Values
We demonstrate a wavefront sensor based on the compressive sensing,
single-pixel camera. Using a high-resolution spatial light modulator (SLM) as a
variable waveplate, we weakly couple an optical field's transverse-position and
polarization degrees of freedom. By placing random, binary patterns on the SLM,
polarization serves as a meter for directly measuring random projections of the
real and imaginary components of the wavefront. Compressive sensing techniques
can then recover the wavefront. We acquire high quality, 256x256 pixel images
of the wavefront from only 10,000 projections. Photon-counting detectors give
sub-picowatt sensitivity
The mechanisms of action of malaria therapy: experimental studies and a review of action in general paresis
Demonstrating Continuous Variable EPR Steering in spite of Finite Experimental Capabilities using Fano Steering Bounds
We show how one can demonstrate continuous-variable Einstein-Podolsky-Rosen
(EPR) steering without needing to characterize entire measurement probability
distributions. To do this, we develop a modified Fano inequality useful for
discrete measurements of continuous variables, and use it to bound the
conditional uncertainties in continuous-variable entropic EPR-steering
inequalities. With these bounds, we show how one can hedge against experimental
limitations including a finite detector size, dead space between pixels, and
any such factors that impose an incomplete sampling of the true measurement
probability distribution. Furthermore, we use experimental data from the
position and momentum statistics of entangled photon pairs in parametric
downconversion to show that this method is sufficiently sensitive for practical
use.Comment: 7 pages, 2 figure
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