Rydberg Cell Sensor Receiver With Spaced Apart Pulsed Probe Beams
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current RF receivers and sensors are limited by their size, weight, and power constraints, and lack the sensitivity to effectively cover wide bandwidths such as 0-100 GHz, especially with emerging waveforms and distributed sensing networks, as they are not compatible with new RF applications and have low sampling rates due to the slow response time of atomic systems.
Innovation Solution
A Rydberg cell-based sensor receiver that generates spaced apart pulsed probe beams without scanning, using an optical source, pulse shaper, and optical delay elements to increase sampling rates and reduce latency, allowing for higher sensitivity and broader frequency coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional RF antennas are used, then high technology readiness level and ease of operation are achieved, but sensitivity and frequency coverage bandwidth are limited
Solution Approach 1:
The patent replaces conventional mechanical RF antennas with a Rydberg atom-based sensor system that uses atomic vapor cells and laser probing to detect RF signals. This substitution enables broadband frequency coverage from KHz to THz while maintaining high sensitivity, as the atomic transitions respond to a wide range of frequencies without the physical constraints of antenna size and wavelength matching.
Solution Approach 2:
The patent changes the detection parameter from electrical voltage/current in conventional antennas to optical absorption characteristics in Rydberg atoms. By measuring the attenuation of probe laser beams through the atomic vapor cell, the system achieves enhanced sensitivity and broadband coverage, as the atomic polarizability varies with frequency in a way that provides high sensitivity across a wide frequency range.
2Reliability
If Rydberg atom-based sensors are used, then sensitivity and frequency coverage are improved, but sampling rate is reduced due to slow atomic response time
Solution Approach 1:
The patent uses pulsed probe beams instead of continuous probing to interrogate the Rydberg atoms. By applying periodic pulsed excitation and measurement sequences, the system can sample the RF signal at higher rates than the atomic response time would suggest, as the pulsed nature allows for time-gated detection and reduces the effective measurement cycle time.
Solution Approach 2:
The patent applies a coupling laser beam to pre-excite the atoms into Rydberg states before the probe beam arrives. This preliminary action prepares the atomic system in advance, reducing the response time required during the actual measurement phase and enabling faster sampling rates.
3Measurement precision
If scanning is used to measure RF signals, then measurement precision is improved, but latency and response time are increased
Solution Approach 1:
The patent employs multiple pulsed probe beams with different frequencies or temporal characteristics that can simultaneously interrogate different aspects of the RF signal. This periodic pulsed approach allows for parallel measurement of multiple spectral features without sequential scanning, reducing latency while maintaining measurement precision through the use of multiple probes.
Solution Approach 2:
The patent transitions from sequential spectral scanning in one dimension to simultaneous multi-frequency probing by introducing temporal and spatial dimensions. Multiple probe beams can be applied at different times or positions, allowing parallel extraction of spectral information without the time penalty of sequential scanning.
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
The solution enables higher sensitivity and faster data processing, allowing for higher RF data rates and reduced latency, with improved signal-to-noise ratio and bit error rate performance, effectively covering broader bandwidths without the need for scanning, thereby enhancing the capability to detect emerging RF applications.
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. These Rydberg states are very responsive to local electric fields and the response of the atom to an external electric field, such as an RF signal
Implementation Method 3
The magnitude of the electric field component of the incoming RF radiation may be determined by measuring the spectral splitting of two features in the probe laser absorption spectrum
Implementation Method 4
The probe source may comprise an optical source, and a pulse shaper downstream from the optical source. The probe source may comprise a beam splitter downstream from the pulse shaper, and a respective optical delay element in a path of each beam downstream from the beam splitter
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A sensor receiver includes a Rydberg cell configured to be exposed to a radio frequency (RF) signal, and a probe source configured to generate a plurality of spaced apart pulsed probe beams within the Rydberg cell. The pulsed probe beams are offset in time from one another. A detector is positioned downstream from the Rydberg cell.