US 12,289,135 B2
Electromagnetic field detector
Liam Bussey, London (GB); Amelia Lees, London (GB); Fraser Burton, London (GB); Marco Menchetti, London (GB); and Timothy Whitley, London (GB)
Assigned to BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY, London (GB)
Appl. No. 18/863,938
Filed by British Telecommunications Public Limited Company, London (GB)
PCT Filed Apr. 11, 2023, PCT No. PCT/EP2023/059390
§ 371(c)(1), (2) Date Nov. 7, 2024,
PCT Pub. No. WO2023/217473, PCT Pub. Date Nov. 16, 2023.
Claims priority of application No. 22173349 (EP), filed on May 13, 2022.
Prior Publication US 2025/0112709 A1, Apr. 3, 2025
Int. Cl. H04B 10/70 (2013.01); G01R 29/08 (2006.01); H04B 10/60 (2013.01)
CPC H04B 10/70 (2013.01) [G01R 29/0885 (2013.01); H04B 10/60 (2013.01); H04B 2210/006 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method of detecting a photon in a first frequency range, the method comprising the steps of:
exciting a first transmission medium by a first probe signal at a first probe frequency, wherein the first probe signal excites electrons of the first transmission medium from a ground state of the first transmission medium to a first excited state of the first transmission medium;
exciting the first transmission medium by a first coupling signal at a first coupling frequency, wherein the first coupling signal overlaps with the first probe signal in the first transmission medium and excites the electrons of the first transmission medium to a predetermined excited state of the first transmission medium such that a first photon in the first frequency range and having a first polarisation incident upon the first transmission medium excites an electron in the predetermined excited state of the first transmission medium to a further excited state of the first transmission medium, wherein a first photon in a second frequency range is emitted as part of a subsequent deexcitation of the electron from the further excited state of the first transmission medium;
detecting the first photon in the first frequency range and having the first polarisation by detecting the first photon in the second frequency range;
exciting a second transmission medium by a second probe signal at a second probe frequency, wherein the second probe signal excites electrons of the second transmission medium from a ground state of the second transmission medium to a first excited state of the second transmission medium;
exciting the second transmission medium by a second coupling signal at a second coupling frequency, wherein the second coupling signal overlaps with the second probe signal in the second transmission medium and excites the electrons of the second transmission medium to a predetermined excited state of the second transmission medium such that a second photon in the first frequency range incident upon the second transmission medium and having a second polarisation excites an electron in the predetermined excited state of the second transmission medium to a further excited state of the second transmission medium, wherein a second photon in the second frequency range is emitted as part of a subsequent deexcitation of the electron in the further excited state of the second transmission medium; and
detecting the second photon in the first frequency range having the second polarisation by detecting the second photon in the second frequency range.