Compact Quantum Sensors Aim to Keep Military Platforms on Course When GPS Goes Dark

When GPS signals get jammed, spoofed, or simply disappear behind a mountain range, the whole navigation picture can crumble for a fighter, a drone or a hypersonic glide vehicle. That’s the dilemma Airmen and Guardians are wrestling with on a daily basis, and it’s why a modest‑sized quantum sensor is suddenly grabbing a lot of attention.

On September 14, Wichita‑based Nitride Global announced it had snagged a Phase I Small Business Innovation Research award from AFWERX, the Air Force’s fast‑track innovation arm. The money will fund a feasibility study of a “microwave atom‑chip” – technically called the Atom‑Interferometer Microwave Atom Chip, or A‑MAC – built on the company’s aluminum‑oxynitride (AlON) platform.

In plain English, the device is a tiny interferometer that watches the wave‑like behavior of atoms. By measuring how those matter‑waves shift under acceleration or rotation, the sensor can infer precise motion data – essentially a super‑stable inertial measurement unit that doesn’t need any satellite updates.

That sounds great, but there’s a catch. Most existing atom‑interferometers sit on a lab bench the size of a small fridge, with a sprawling maze of microwave tubes, power supplies and bulky ceramic packages. The physics itself isn’t the bottleneck; it’s the surrounding hardware that blows up the size, weight and power budget.

The A‑MAC concept tries to squash all that extra hardware onto a single board. By layering microwave routing, coupling structures and the atom‑trapping geometry inside a thin, conformal AlON dielectric stack, heat can be shunted straight to a metal heat‑sink instead of having to crawl through a massive ceramic block. The result could be a sensor that fits into a cubic‑centimeter volume – small enough to hitch a ride on a missile or a low‑observable UAV.

To get the physics right, Nitride Global is teaming up with Dr. Seth Aubin, an associate professor of physics at William & Mary. Aubin’s group has spent more than a decade perfecting microwave atom‑chip traps, so they’ll be the subcontractor crunching the numbers on trap geometry, microwave insertion loss and thermal performance. By the end of the twelve‑month Phase I, the partners will hand over a decision gate report that outlines whether a Phase II build‑out makes sense.

If the prototype lives up to expectations, the sensor could serve as a satellite‑independent navigation, positioning and timing (PNT) solution for a host of platforms: hypersonic glide vehicles soaring at Mach 5, autonomous drones flying in contested airspace, underwater vehicles that can’t surface for a GPS fix, and even orbital assets that need an extra layer of resilience.

Beyond the battlefield, the same technology could trickle down to commercial uses – think subsurface mineral mapping, infrastructure health monitoring, or oil‑field exploration where GPS is unreliable.

“Quantum inertial sensing has been constrained for the same reason power electronics were a decade ago – the package, not the physics, sets the limit,” says Mahyar Khosravi, CEO of Nitride Global. “If we can route microwaves and manage heat in the same material, the whole instrument finally becomes small enough to fly.”

The company is now reaching out to aerospace and defense integrators for input on form‑factor, environmental ruggedness and performance thresholds. Their hope is to turn a lab curiosity into a field‑ready component that keeps missions on track when the sky goes dark.