Vorrichtung, System und Verfahren zur Automatischen Photonenpolarisationskorrektur in Quantenschlüsselverteilungssystemen

Details

Veröffentlichungs-Nr.

EP4742560

Anmeldetag

11. November 2024

Veröffentlichung

13. Mai 2026

Rechtsraum

EP

IPC

H04B10/118, H04B10/70

Abstract

The present invention discloses a device (1) for receiving an initial sequence (2) of polarized photons, modifying the polarization of each of said photons and performing measurements upon each of said photons according to an embodiment of the present invention. The device (1) comprises a beam splitter (3); two half-wave plates (4, 4'), two quarter-wave plates (5, 5'); two polarizer beam splitters (6, 6'), four single-photon detectors (7, 7', 7", 7‴), tagging means (8) connected to the single-photon detectors (7, 7', 7", 7‴) and rotating means (9) connected to the half-wave (4, 4') and quarter-wave plates (5, 5'). These elements are arranged and configured in such a way that the polarization of each photon comprised in the incoming light beam or initial sequence (2) of photons can be corrected before decoding. A system for transmitting a cryptographic key according to a Quantum Key Distribution, protocol with polarization correction and a method for correcting the polarization of each photon comprised in the sequence of photons used in the transmission of a cryptographic key according to a QKD protocol are also disclosed.

Anmelder

Firma

Consejo Superior De Investigaciones Científicas - CSIC

Land

🇪🇸 Spanien