Rydberg-Atom Electromagnetic Field Detection with Single-Photon Readout
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Solution Overview
Problem
Existing Rydberg-atom based electromagnetic field detectors suffer from low sensitivity, particularly in detecting single photons in the RF range, due to high background noise and the need for multiple photons to cause a detectable change in intensity.
Innovation Solution
The use of single-photon detectors, such as photomultiplier tubes or Single-Photon-Avalanche-Diodes, configured to detect characteristic photons emitted during the decay of electrons from a further Rydberg state to the ground state, indirectly detecting RF signals by exploiting the Rydberg-atom based EIT effect, with a reflective coating to enhance sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If absorption or interferometric techniques are used to detect electromagnetic fields, then the detection method is established, but the sensitivity is insufficient due to high background noise and requirement of multiple photons
Solution Approach 1:
The patent introduces an intermediary detection mechanism using single-photon detectors to detect characteristic photons emitted during Rydberg state decay, rather than directly detecting the RF signal photons. This intermediary approach converts the undetectable RF photons into detectable optical photons, enabling single-photon level sensitivity while eliminating background noise issues that plague direct detection methods
Solution Approach 2:
The patent replaces traditional absorption or interferometric detection mechanisms with a fluorescence-based detection system. Instead of measuring changes in probe laser intensity through absorption or interference (which require multiple photons), the system uses single-photon detectors to count individual characteristic photons emitted during Rydberg state decay, substituting a quantum optical detection mechanism for classical detection methods
2Measurement precision
If traditional absorption or interferometric techniques are used, then the detection system is established, but multiple photons are required to achieve detectable signal change
Solution Approach 1:
The patent segments the detection process into distinct quantum transitions: the RF photon induces a transition from a predetermined Rydberg state to a further Rydberg state, which then decays to the ground state emitting a characteristic photon. This segmentation allows detection of a single RF photon through the emission of a separate characteristic photon, eliminating the need to detect multiple RF photons simultaneously
Solution Approach 2:
The patent changes the detection parameter from measuring RF photon intensity directly to counting characteristic optical photons emitted during Rydberg state decay. This parameter change from electromagnetic field intensity measurement to photon counting enables single-photon detection sensitivity, as single-photon detectors can resolve individual photon events rather than requiring statistical accumulation of multiple photons
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves sensitivity by enabling single-photon detection of RF signals, reducing background noise and enhancing detection capabilities beyond traditional absorption or interferometric techniques.
Implementation Method 1
A Rydberg-atom based electromagnetic field detector is based on the Electromagnetically Induced Transparency (EIT) effect. The EIT effect may be experienced when a probe laser and a coupling laser are used to elevate electrons of an atomic medium to a Rydberg state.
Implementation Method 2
The use of single-photon detectors, such as photomultiplier tubes or Single-Photon-Avalanche-Diodes, configured to detect characteristic photons emitted during the decay of electrons from a further Rydberg state to the ground state
Implementation Method 3
with a reflective coating to enhance sensitivity
Data Source
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AI summary
This invention provides 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 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 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. This invention also provides a detector and system for implementing said method.