Bell Inequality Tests with Macroscopic Entangled States of Light
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by
Magdalena Stobińska, Pavel Sekatski, Adam Buraczewski, Nicolas
Gisin, Gerd Leuchs
2011
Abstract
Quantum correlations may violate the Bell inequalities. Most of the
experimental schemes confirming this prediction have been realized in
all-optical Bell tests suffering from the detection loophole. Experiment which
closes this loophole and the locality loophole simultaneously is highly
desirable and remains challenging. A novel approach to a loophole-free Bell
tests is based on amplification of the entangled photons, i.e.\@ on macroscopic
entanglement, which optical signal should be easy to detect. However, the
macroscopic states are partially indistinguishable by the classical detectors.
An interesting idea to overcome these limitations is to replace the
postselection by an appropriate preselection immediately after the
amplification. This is in the spirit of state preprocessing revealing hidden
nonlocality. Here, we examine one of possible preselections, but the presented
tools can be used for analysis of other schemes. Filtering methods making the
macroscopic entanglement useful for Bell test and quantum protocols are the
subject of an intensive study in the field nowadays.
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