Rydberg Cell RF Transmitter with Coherent Signal Combining
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Solution Overview
Problem
Conventional RF transmitters are limited by size, weight, and power constraints, and lack compatibility with emerging waveforms and wide bandwidths, while existing quantum RF receivers, such as Rydberg atom-based sensors, have focused primarily on sensing rather than transmitting RF signals.
Innovation Solution
A quantum RF signal transmitter comprising a plurality of Rydberg cells, each generating an RF signal, combined using a combiner with phase shifters and true time delay units to produce a coherent RF output, utilizing lasers to excite different energy states and amplify the signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional RF antennas are used, then the transmitter can operate at high TRL with established technology, but the device is limited by Size, Weight and Power (SWaP) constraints and narrow frequency band coverage
Solution Approach 1:
The patent divides the RF transmission function into multiple Rydberg cells, each capable of operating at different frequency bands. This segmentation allows the system to achieve broad frequency coverage (from tens of KHz to THz) while maintaining the reliability of individual cell operations based on established quantum sensing principles.
Solution Approach 2:
The Rydberg cell design provides multi-functionality by enabling operation across multiple RF bands (1-10 GHz, 20-40 GHz, and beyond) within a single device architecture. The system can adapt to different waveforms and frequency requirements, making it universally applicable to emerging RF applications while maintaining high TRL through proven quantum measurement techniques.
2Device complexity
If conventional RF antennas are used, then the transmitter structure is simple and well-understood, but the device exhibits high SWaP (Size, Weight, and Power) and limited sensitivity
Solution Approach 1:
The patent combines multiple Rydberg cells with a common laser system and control electronics to create an integrated RF transmitter. This merging approach achieves high power output through coherent combination of signals from multiple cells while managing system complexity through shared components. The combination of cells also improves sensitivity, achieving up to −200 dB detection capability compared to conventional antenna limits of −130 to −160 dB.
3Adaptability or versatility
If conventional RF transmitters are used, then the device can cover specific frequency bands, but it lacks compatibility with emerging waveforms such as frequency hopping between bands
Solution Approach 1:
The Rydberg cell system implements dynamic frequency tuning by adjusting laser parameters to excite different Rydberg transitions. This dynamic capability enables frequency hopping between bands and adaptation to emerging waveforms without requiring complex hardware reconfiguration. The system can rapidly switch between frequency bands by modifying laser frequency or power, providing waveform compatibility while maintaining relatively simple device architecture.
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 system achieves broad frequency coverage and high sensitivity, enabling transmission of RF signals across a wide range with improved power output and longer transmission distances, overcoming SWaP limitations and waveform compatibility issues.
Implementation Method 1
A plurality of lasers may generate a plurality of respective different frequency laser beams into the Rydberg cell to selectively excite different energy states and generate the RF signal
Implementation Method 2
atoms are simultaneously excited into a quantum 'Rydberg' state with both a coupling laser and probe laser. These quantum Rydberg states are very responsive to local electric fields
Implementation Method 3
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. The response of the atom to an external electric field, such as an RF signal, alters the measured attenuation of the probe laser
Implementation Method 4
The magnitude of the electric field component of the incoming RF radiation and its center frequency detuning from atomic resonance may be determined by measuring the magnitude and asymmetry of spectral splitting of the electromagnetically induced transparency (EIT), which is called Autler Townes (AT) splitting
Implementation Method 5
A combiner downstream from the plurality of Rydberg cells may be configured to combine the respective RF signals into an output RF signal
Data Source
AI summary
A quantum radio frequency (RF) signal transmitter may include a plurality of Rydberg cells, each configured to generate a respective RF signal. A combiner downstream from the plurality of Rydberg cells may be configured to combine the respective RF signals into an output RF signal.