Мой комментарий к записи «минус семьдесят в Гренландии» от golos_dobra
Я наткнулся на статейку (Single-electron entanglement and nonlocality, David Dasenbrook
et al 2016 New J. Phys. 18 043036) о запутанности (запутанность - повышенние ранга тензорности?) одного электрона самого с собой и далее по цепочке добрался до
What are single photons good for?
Nicolas Sangouard and Hugo Zbinden
Group of Applied Physics, University of Geneva, 1211 Geneva 4, Switzerland
(Dated: February 3, 2012)
Single-photon sources are widely developed worldwide. Some produce single-photons in a heralded way,
e.g. from a pair source, the detection of one photon heralding the production of its twin. Others produce
them on-demand, e.g. using a single quantum emitter. But what for? For fun? Certainly. ...
To build up a quantum computer? Maybe.
...If you sketch QKD on a piece of paper, it is natural to consider a perfect single photon emitter as a light
source. By doing this, the security analysis is rather simple as a potential eavesdropper, Eve, has no means to
split the signal. However, if you are an experimentalist, you will quickly understand that the realization of a
true single-photon source is not a piece of cake....
However, one should not precipitously conclude that single-photon sources are mandatory for QKD. Indeed,
there are a couple of clever countermeasures allowing one to implement efficient QKD with faint laser pulses.
The most simple trick is a mere change in the sifting procedure...
Где как-раз объясняется как обычные лазерные импульсы реально работают, вместо описанных во всех учебниках запутанных фотонов.
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