20,262 research outputs found
Heisenberg limited Sagnac interferometry
We show how the entangled photons produced in parametric down conversion can
be used to improve the sensitivity of a Sagnac interferometer. Two-photon and
four-photon coincidences increases the sensitivity by a factor of two and four
respectively. Our results apply to sources with arbitrary pumping and squeezing
parameters.Comment: 11 pages, 5 figure
Quantum interferometry using coherent beam stimulated parametric down-conversion
We show how stimulated parametric processes can be employed in experiments on
beyond the diffraction limit to overcome the problem of low visibility obtained
by using spontaneous down conversion operating in the high gain regime. We
further show enhancement of the count rate by several orders when stimulated
parametric processes are used. Both the two photon counts and the visibility
can be controlled by the phase of the stimulating coherent beam.Comment: 7 pages, 4 figure
Stable Marriage with Multi-Modal Preferences
We introduce a generalized version of the famous Stable Marriage problem, now
based on multi-modal preference lists. The central twist herein is to allow
each agent to rank its potentially matching counterparts based on more than one
"evaluation mode" (e.g., more than one criterion); thus, each agent is equipped
with multiple preference lists, each ranking the counterparts in a possibly
different way. We introduce and study three natural concepts of stability,
investigate their mutual relations and focus on computational complexity
aspects with respect to computing stable matchings in these new scenarios.
Mostly encountering computational hardness (NP-hardness), we can also spot few
islands of tractability and make a surprising connection to the \textsc{Graph
Isomorphism} problem
Using a Goal-Driven Approach in the Investigation of a Questioned Contract
Part 3: FORENSIC TECHNIQUESInternational audienceThis paper presents a systematic process for describing digital forensic investigations. It focuses on forensic goals and anti-forensic obstacles and their operationalization in terms of human and software actions. The paper also demonstrates how the process can be used to capture the various forensic and anti-forensic aspects of a real-world case involving document forgery
- …