Electromagnetic field receiver

Patent metadata

Field	Value
Publication number	US-12250025-B2
Application number	US-202218554529-A
Country	US
Kind code	B2
Filing date	Mar 4, 2022
Priority date	Apr 9, 2021
Publication date	Mar 11, 2025
Grant date	Mar 11, 2025

Abstract

This disclosure provides a method of receiving a plurality of data streams at an electromagnetic field receiver in a wireless telecommunications network, the method including obtaining data indicating detection of a first electromagnetic field incident at a transmission medium during a timeslot of a first subset of a plurality of timeslots; associating the detected first electromagnetic field with a first data stream of a plurality of data streams; obtaining data indicating detection of a second electromagnetic field incident at the transmission medium during a timeslot of a second subset of the plurality of timeslots; and associating the detected second electromagnetic field with a second data stream of the plurality of data streams.

First claim

The invention claimed is:

1. A method of receiving a plurality of data streams at an electromagnetic field receiver in a wireless telecommunications network, wherein the electromagnetic field receiver comprises a first optical transmitter, a second optical transmitter, a first transmission medium, a second transmission medium, a first photodetector, and a second photodetector, the first transmission medium and the second transmission medium being spatially distinct, wherein the first optical transmitter is configured to transmit a first probe signal to the first photodetector through the first transmission medium at a first probe frequency and to transmit a second probe signal to the second photodetector through the second transmission medium at a second probe frequency, and the second optical transmitter is configured to transmit a first coupling signal through the first transmission medium at a first coupling frequency and to transmit a second coupling signal through the second transmission medium at a second coupling frequency, wherein the first probe frequency and the first coupling frequency are set to excite electrons of the first transmission medium to a first predetermined Rydberg state so as to induce an Electromagnetic Induced Transparency (EIT) effect in the first transmission medium such that an incident electromagnetic field at a first frequency at the first transmission medium causes a detectable change in the first probe signal at the first photodetector, wherein the second probe frequency and the second coupling frequency are set to excite electrons of the second transmission medium to a second predetermined Rydberg state so as to induce an EIT effect in the second transmission medium such that an electromagnetic field at a second frequency incident at the second transmission medium causes a detectable change in the second probe signal at the second photodetector, wherein the plurality of data streams are time multiplexed in a first time frame comprising a plurality of timeslots, such that a first data stream is communicated in a first subset of the plurality of timeslots of the first time frame and a second data stream is communicated in a second subset of the plurality of timeslots of the first time frame, the method comprising:
obtaining data indicating detection by the first photodetector, in the first probe signal, of a first electromagnetic field incident at the first transmission medium during a timeslot of the first subset of the plurality of timeslots;
associating the detected first electromagnetic field with a first data stream of the plurality of data streams;
obtaining data indicating detection by the second photodetector, in the second probe signal, of a second electromagnetic field incident at the second transmission medium during a timeslot of the second subset of the plurality of timeslots; and
associating the detected second electromagnetic field with a second data stream of the plurality of data streams.

2. The method as claimed in claim 1 , wherein the first predetermined Rydberg state and the second predetermined Rydberg state are the same.

3. The method as claimed in claim 2 , wherein the first probe signal and the first coupling signal are transmitted through the first transmission medium and the second transmission medium in a first condition and a second condition, and wherein:
in the first condition of each of the first transmission medium and the second transmission medium, the first probe signal and the second probe signal, and the first coupling signal and the second coupling signal, are transmitted through the respective first transmission medium and the second transmission medium,
the second condition of each of the first transmission medium and the second transmission medium exists for a time period for which an effect of the first coupling signal and the second coupling signal, respectively, on the electrons of the first transmission medium and the second transmission medium, respectively, persists after a switch from the first condition to the second condition, and
an intensity of the first coupling signal and the second coupling signal is such that:
Ω c 2 <Γ 1 Γ 2

in which Ω c is a Rabi frequency of the first coupling signal and the second coupling signal, Γ 1 is a transition rate out of the first excited state of the first transmission medium and the second transmission medium, and Γ 2 is a transition rate out of the predetermined excited state of the first transmission medium and the second transmission medium.

4. The method as claimed in claim 1 , wherein the first predetermined Rydberg state and the second predetermined Rydberg state are different.

5. The method as claimed in claim 4 , wherein the plurality of data streams are also time multiplexed in a second time frame comprising a plurality of timeslots, such that a third data stream is communicated in a first subset of the plurality of timeslots of the second time frame and a fourth data stream is communicated in a second subset of the plurality of timeslots of the second time frame, and the method further comprising:
obtaining data indicating detection of a third electromagnetic field incident at the transmission medium during a timeslot of the first subset of the plurality of timeslots of the second time frame;
associating the detected third electromagnetic field with the third data stream of the plurality of data streams;
obtaining data indicating detection of a fourth electromagnetic field incident at the transmission medium during a timeslot of the second subset of the plurality of timeslots of the second time frame; and
associating the detected fourth electromagnetic field with the fourth data stream of the plurality of data streams.

6. A computer system comprising at least one processor and memory storing instructions which, when the instructions are executed by the at least one processor, cause the computer system to carry out the method of claim 1 .

7. A non-transitory computer readable carrier medium comprising the computer program of claim 6 .

8. A method of receiving a plurality of data streams at an electromagnetic field receiver in a wireless telecommunications network, wherein the electromagnetic field receiver comprises a first optical transmitter, a second optical transmitter, a first transmission medium, a second transmission medium, a first photodetector, and a second photodetector, the first transmission medium and the second transmission medium being spatially distinct, wherein the first optical transmitter is configured to transmit a first probe signal to the first photodetector through the first transmission medium at a first probe frequency and to transmit a second probe signal to the second photodetector through the second transmission medium at a second probe frequency, the second optical transmitter is configured to transmit a first coupling signal through the first transmission medium at a first coupling frequency and to transmit a second coupling signal through the second transmission medium at a second coupling frequency, the first probe frequency and the first coupling frequency are set to excite electrons of the first transmission medium to a first predetermined Rydberg state so as to induce an Electromagnetically Inducted Transparency (EIT) effect in the first transmission medium such that an electromagnetic field at a first frequency incident at the first transmission medium causes a detectable change in the first probe signal at the first photodetector, and the second probe frequency and the second coupling frequency are set to excite electrons of the second transmission medium to a second predetermined Rydberg state, different from the first predetermined Rydberg state, so as to induce an EIT effect in t

Assignees

• British Telecomm

Inventors

• Winterburn Amelia
• Menchetti Marco

Classifications

• H04B2210/006

  Devices for generating or processing an RF signal by optical means · CPC title

• H04B10/00

  Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication · CPC title

• G01R29/08

  Measuring electromagnetic field characteristics · CPC title

• H04B10/118

  specially adapted for satellite communication · CPC title

• H04B10/60 Primary

  Receivers · CPC title