{"id":366,"date":"2018-10-25T22:01:10","date_gmt":"2018-10-25T22:01:10","guid":{"rendered":"https:\/\/www.q-crypt.com\/?page_id=366"},"modified":"2018-11-01T04:41:32","modified_gmt":"2018-11-01T04:41:32","slug":"curves-draft","status":"publish","type":"page","link":"https:\/\/www.q-crypt.com\/index.php\/curves-draft\/","title":{"rendered":"4.2 Curves ( draft )"},"content":{"rendered":"
4.2 Curves<\/h5>\n

Foremost, it was an initially impossible challenge and it seems won! At first sight, the curves are as expected and the idea of looking was not in vain!<\/p>\n

Each polarizer is related to a rate of detections, also called arm efficiency<\/em> ( AE). The general efficiency or cross efficiency<\/em> is the pairs rate of the 2 polarizers, in general the product of the 2 arms efficiencies.<\/p>\n

With this first simulated curves comparison, the efficiency by arm is 84.9%, of the same order as the best detectors currently in the market. In the lab, the efficiency objectively reported in the greatest experiments [4] is lower. When the efficiency is summed on the raw data, before the lab experiment data filtering, the rates are 1 to 3 orders lower. That the lab filters the data in a fundamental experiment is beyond the scope of this article.<\/em><\/p>\n

\n

Observe that the green and magenta curves are almost superposed with different values of the m and n crystal parameters.
\n\"n=8
\nThe functions vary smoothly with the change of\u00a0 the n and m parameters. m can be real but n must be an integer.
\n\"n=7
\nThese 4 curves are the most efficient respectively for n=8,7,6 and 5.<\/p>\n

the parameters setting n=6 and m=6.5 gives the more similar to cos\u00b2 curve.
\n\"n=6<\/p>\n

It seems that n=5 and m=5.25 is the more similar to the lab correlation curve, with less fitting at extreme values.
\n\"n=5<\/p>\n

\n

We can choose the m and n parameters to get more detections at the price of more differences between the curves.
\nWhen m becomes high , the efficiency raises until 99% and the curve is this time similar to the classical reference. Specific labs experiments, exploring the variations of n and m, may ask the physicality of the distribution.
\n\"old<\/p>\n

\n

 <\/p>\n

Is the curve below acceptable as quantum like ? probably yes. A 90% efficiency detector doesn’t yet exist.
\n\"n=8<\/p>\n

\n

More troubling is this curve, as classical as the others and not only because it would show more ‘entanglements<\/em>‘:
\n\"n=5
\nIt is more or less a situation encoutered by a recent quantum experiment [6] where experimenters act on 2 variables to herald the entanglement. Is it entanglement or simple classical strong correlations, not expected only because we are not really familiar with correlations of periodic functions?<\/p>\n

References<\/strong>
\n6 U. Schilling, C. Thiel, E. Solano, T. Bastin, and J. von Zanthier: Heralded Entanglement of Arbitrary Degree in Remote Qubits ( september 2018 )<\/p>\n

Click here to return to the main page of the article<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

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