Spaced Rydberg Sensor Nodes for Low-SWaP RF Communication
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Solution Overview
Problem
Conventional RF receivers and sensors are limited by size, weight, and power constraints, and are not compatible with emerging waveforms and non-line-of-sight communication requirements, particularly for frequencies requiring larger antennas, which hampers secure quantum communications.
Innovation Solution
A system comprising a receiver node and a spaced apart Rydberg sensor node, utilizing a coupling laser and a probe laser to generate a laser output based on RF signals, enabling non-line-of-sight communication and secure quantum communication through a free space or optical fiber laser output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional RF antennas are used, then technology readiness is high and devices are widely used, but size, weight, and power are limited and frequency band coverage is narrow
Solution Approach 1:
The patent replaces conventional mechanical RF antenna systems with a Rydberg atom-based sensing system that uses optical probes to detect RF signals. This substitution eliminates the need for large physical antennas while maintaining RF detection capability, directly addressing the SWaP limitation.
Solution Approach 2:
The patent changes the detection parameter from direct RF signal reception by antennas to optical probe attenuation measurement through Rydberg atoms. This parameter transformation enables RF detection without requiring traditional antenna structures, resolving the contradiction between reliability and SWaP.
2Reliability
If conventional RF antennas are used, then technology readiness is high, but frequency band coverage is limited to narrow bands
Solution Approach 1:
The Rydberg atom-based sensing system provides universal RF detection capability across multiple frequency bands. The same atomic vapor cell and optical probe configuration can detect RF signals from tens of kHz to hundreds of MHz, making the system adaptable to various frequency ranges without requiring frequency-specific antenna designs.
Solution Approach 2:
By changing the detection mechanism from antenna-based frequency-selective reception to atomic transition-based detection, the system achieves broad frequency coverage. The Rydberg atoms can be tuned to different transition frequencies, enabling the same hardware to operate across wide frequency bands.
3Reliability
If standard RF antenna relays are used for non-line-of-sight communication, then communication can be established, but the system becomes cumbersome and slow
Solution Approach 1:
The patent uses Rydberg atoms as an intermediary medium to transfer RF signal information. Instead of using physical antenna relays that require signal bouncing and retransmission, the optical probe directly measures the RF signal's effect on atomic transitions, providing a simpler and faster communication path for non-line-of-sight scenarios.
Solution Approach 2:
The patent replaces the mechanical signal relaying process with an optical measurement process. The RF signal's effect is converted to an optical signal attenuation measurement, eliminating the need for complex signal routing and retransmission mechanisms, thereby reducing system complexity and latency.
4Reliability
If large RF antennas are used for non-line-of-sight communication, then communication range is improved, but size and weight constraints are violated
Solution Approach 1:
The patent substitutes large physical antennas with a compact Rydberg sensing system. The optical probe and atomic vapor cell provide equivalent or superior detection capability for non-line-of-sight communication without requiring the large aperture area of traditional antennas, thus meeting SWaP constraints.
Solution Approach 2:
The patent changes the detection parameter from geometric aperture area to atomic transition sensitivity. This parameter change enables effective RF detection and non-line-of-sight communication without requiring large physical structures, resolving the contradiction between communication range and SWaP.
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
Facilitates low-SWaP, low-latency, reconfigurable RF sensing and communication, supporting ad-hoc and non-line-of-sight operations with enhanced sensitivity and security, even in contested environments.
Implementation Method 1
the measurement is based upon the attenuation of a probe laser due to absorption in a small room temperature vapor cell filled with alkali atoms
Implementation Method 2
atoms are simultaneously excited into a 'Rydberg' state with both a coupling and probe
Implementation Method 3
A coupling laser and a probe laser cooperate with the Rydberg sensor node to generate a laser output to the receiver node
Implementation Method 4
an optical fiber may be between the receiver node and Rydberg sensor node and the laser output may comprise an optical fiber laser output
Data Source
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AI summary
A system 20 may include a receiver node 24 and a Rydberg sensor node 28 in spaced apart relation from the receiver node. A coupling laser 30 and a probe laser 32 may cooperate with the Rydberg sensor node 28 to generate a laser output to the receiver node 24 based upon a received radio frequency (RF) signal. The coupling laser 30 and probe laser 32 may define a transmitter node 38 in spaced apart relation from the Rydberg sensor node 28. The transmitter node 38 may be co-located with the receiver node 24.