Quantum Radio Frequency Receivers
Infleqtion’s SqyWire, a Quantum Radio Frequency (QRF) antenna and receiver system, represents a revolution in wireless technology. SqyWire uses the special capabilities of Rydberg atomic sensing to detect and process signals, in contrast to conventional communication gear that depends on metal antennae and solid-state analog receivers. The system is able to bypass many of the physical limitations that have traditionally restricted RF performance with this shift from classical to quantum-enabled sensing, providing an ultra-broadband, compact, and extremely durable solution.
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Rydberg Atomic Sensing Science
Highly excited Rydberg states of atoms are used at the core of SqyWire. Infleqtion has developed a three-step quantum sensing method that replaces traditional RF front ends by using these particular atomic states.
- Laser Excitation: Atoms are first excited into Rydberg states using lasers.
- RF Interaction: These atomic energy levels are disturbed by the presence of an external RF field.
- Optical Detection: The system then transforms RF signals into the optical domain by detecting changes in a probe beam.
This technique functions similarly to RF photonics, but it doesn’t use a conventional antenna, allowing for a considerably smaller antenna and a much wider operating range than standard systems. SqyWire can continuously tune from Hz to THz since the atoms themselves serve as the sensor. This is not possible with conventional gear that is restricted to particular antenna shapes.
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Superior RF Alignment and Performance
SqyWire offers a number of innovative advantages for spectrum awareness and wireless communication. With a current operating range of 3 MHz to 6 GHz and a developmental roadmap spanning from sub-kHz to 100s of GHz, its ultra-wideband coverage enables it to surpass conventional RF restrictions.
The system is built for great sensitivity outside its range, functioning near the blackbody radiation limit. This sensitivity is combined with a strong design that continues to function well in difficult and complicated radio frequency settings, providing resilience against interference that frequently deteriorates conventional receivers.
SqyWire’s potential for RF convergence is a key benefit. Multiple old systems may be concurrently replaced by a single, multi-channel quantum RF receiver, enabling a modular and small Size, Weight, and Power (SWaP) footprint. Because it maximizes processing power while requiring the least amount of physical hardware for deployment, it is a perfect option for economical network growth.
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Field Verification: The NetModX23 evolution
SqyWire’s practicality was recently showcased during the Army C5ISR Network Modernization Experiment 2023 (NetModX23). This event, which is organized by the Army’s C5ISR Center, is an essential testing ground for bridging the gap between theoretical quantum potential and practical use on the battlefield.
SqyWire demonstrated exceptional receiver sensitivity throughout a spectrum spanning from High Frequency (HF) to Super High Frequency (SHF) during outdoor testing at Joint Base McGuire-Dix-Lakehurst, NJ. Most notably, the system showed smooth compatibility with tactical radios of the Single Channel Ground and Airborne Radio System (SINCGARS) and Electronic Warfare (EW) sensors. Dr. William Clark, Vice President of Quantum Development at Infleqtion, claims that SqyWire is a “game-changer in defense communications” because of its secure transmission characteristics and multipurpose capabilities.
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Strategic Collaboration and the Road to Miniaturization
To get this QRF technology from the lab to the field, Infleqtion has partnered strategically with L3Harris. L3Harris provides the scale required to implement these disruptive capabilities in the space, air, land, sea, and cyber domains as a worldwide leader in aerospace and defense. As a result of this collaboration, L3Harris, the prime contractor, and Infleqtion, the subcontractor, have already won a secret quantum RF sensing program.
SqyWire’s roadmap shows a distinct path toward ruggedization and miniaturization:
- Gen 1: A 9U system that operates between 3 MHz and 6 GHz.
- Gen 2: An expansion of a 4U system to 1 MHz–12 GHz.
- Gen 3: A robust, modular VPX device made for harsh conditions.
Infleqtion is using silicon photonics and integrated photonics to create chip-scale RF receivers. PIC-based lasers and a tiny PIC-based Tiqker sub-system for accurate laser frequency management and timing will be included in later versions of SqyWire. Deploying quantum sensors onto transportable and fielded platforms—especially for operations in GPS-denied or disputed environments—requires this photonics integration.
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Broad Applications and Future Impact
SqyWire has uses in both the commercial and national security domains. It offers vital spectrum awareness and signal identification in prohibited settings for defense. It enables operators to detect interference and more effectively manage congested spectrum resources for commercial spectrum monitoring. Additionally, it makes sophisticated signal processing methods and novel communications architectures possible.
Infleqtion continues to operate at the “Edge,” providing software-configured solutions that offer unparalleled accuracy, building on 16 years of groundbreaking research from ColdQuanta. SqyWire is at the vanguard of the Quantum Era, providing a route toward more secure, effective, and reliable international communications by transforming the sensing and processing of RF signals.
