NRC seeks quantum light prototype to secure multi-domain communications

SpaceQ  |  Marc Boucher

The National Research Council has issued a Phase 2 grant through Innovative Solutions Canada seeking proposals for an infrared quantum light prototype to protect space-based satellite communications and intelligence links against interception. Designed for multi-domain operations, the technology uses correlated twin beams to establish quantum entanglement channels in the mid-to-far-infrared spectrum, making signals harder to detect against background thermal radiation.

Interception and denial of standard space-based communication networks present significant tactical vulnerabilities for modern defense operations reliant on orbital assets. The solicitation specifies high output power exceeding one watt, short laser pulses under one picosecond, and high repetition rates above one megahertz to support light detection and ranging target identification when space-based positioning signals are compromised. Packaged in a single table-mountable box, the prototype aims to advance technology readiness levels from five to six through integration and testing, with the application window closing on September 15, 2026.

Comment

Transitioning quantum optical channels from near-infrared to the mid-to-far-infrared spectrum alters the physical survivability of space-to-ground quantum key distribution against environmental and adversarial interference. Atmospheric attenuation and solar background noise severely constrain daytime operations in optical links such as those demonstrated by the Micius quantum satellite. Emitting entangled photon pairs at wavelengths exceeding three micrometres exploits atmospheric transmission windows while hiding signals beneath background solar radiance.

This spectral shift requires high-power, sub-picosecond laser sources capable of generating correlated photon states without inducing thermal degradation in non-linear optical crystals. Achieving sub-picosecond pulse durations at high repetition rates enables sustainable quantum key rates through severe atmospheric turbulence. Consequently, high-repetition-rate mid-infrared photon sources allow compact optical terminals to maintain secure quantum key exchange during daylight without relying on bulky cryogenic cooling assemblies.

Strategic Question for Discussion

If mid-infrared quantum light sources successfully overcome daytime background radiance in optical links like those used by the Micius quantum satellite, which operational trade-off will prove more decisive for tactical deployment: transceiver power consumption or atmospheric beam jitter?

The trajectory indicates that transceiver power consumption will represent the primary constraint for forward-deployed units operating on constrained power budgets. While adaptive optics and high repetition rates can partially mitigate atmospheric beam jitter across low-Earth orbit links, producing high-wattage ultrashort pulses in a compact, thermally uncooled footprint introduces severe system integration bottlenecks. Consequently, power efficiency rather than atmospheric correction is likely to dictate the real-world mobility of fieldable quantum SATCOM terminals.

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