US 11,843,419 B2
Quantum communication system using entangle photons
Bruno Sangle-Ferriere, Paris (FR)
Assigned to Bruno Sangle-Ferriere, Paris (FR)
Filed by Bruno Sangle-Ferriere, Paris (FR)
Filed on Jul. 19, 2022, as Appl. No. 17/868,215.
Claims priority of application No. 2107958 (FR), filed on Jul. 22, 2021.
Prior Publication US 2023/0021900 A1, Jan. 26, 2023
Int. Cl. H04B 10/70 (2013.01)
CPC H04B 10/70 (2013.01) 25 Claims
OG exemplary drawing
 
1. A quantum communication system, comprising:
an emitter of entangled photons, comprising a source configured in order to generate at least one pair of entangled photons comprising a first photon emitted on a first propagation path and simultaneously a second photon emitted on a second propagation path different to the first propagation path;
a first receiver arranged on the first propagation path, comprising a complex absorber configured in order to absorb the photon in a polarization state selected from among the states of at least two different pairs of complementary polarization states, with the exception of exactly two pairs of perpendicular linear polarizations in which the polarizations of one of the pairs are at 45° to the polarization directions of the other pair;
a second receiver arranged on the second propagation path so as to be reached by the second photon after the first photon (P1) has reached the first receiver, said second receiver comprising:
an optical amplifier to multiply the second photon while preserving its polarization, and
arranged downstream of the amplifier, a measuring instrument to measure the average polarization of the multiplied photons.