'Frequency-modulated' pulsed Bell setup avoids post-selection
- URL: http://arxiv.org/abs/2307.03203v1
- Date: Wed, 5 Jul 2023 18:09:51 GMT
- Title: 'Frequency-modulated' pulsed Bell setup avoids post-selection
- Authors: M\'onica Ag\"uero, Alejandro Hnilo, Marcelo Kovalsky and Myriam Nonaka
- Abstract summary: Bell experiments require post-selection of data to define coincidences.
In Quantum Key Distribution (QKD), it opens vulnerability in case of a hostile adversary.
A pulsed source gets rid of clocks' drift, but there is still the problem of identifying the same pulse in each remote station.
This immediately defines the condition of valid coincidences in a manner that is unaffected by the drift between the clocks.
- Score: 62.997667081978825
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Excepting event-ready setups, Bell experiments require post-selection of data
to define coincidences. From the fundamental point of view, post-selection is a
true 'logical loophole'. From the practical point of view, it implies a
numerically heavy and time consuming task. In Quantum Key Distribution (QKD),
it opens vulnerability in case of a hostile adversary. The core of the problem
is to synchronize independent clocks during long observation runs. A pulsed
source gets rid of clocks' drift, but there is still the problem of identifying
the same pulse in each remote station. We use a frequency modulated pulsed
source to achieve it. This immediately defines the condition of valid
coincidences in a manner that is unaffected by the drift between the clocks. It
allows finding the set of entangled pairs avoiding post-selection and in a way
that is found to be optimal. It is also robust against a hostile adversary in
the case of QKD.
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