The Pentagon's Robust Quantum Sensors program backs Q-CTRL to build rugged quantum navigation for contested environments.
GPS is vital yet fragile. DARPA and Q-CTRL are turning quantum devices into navigation systems that can’t be jammed or spoofed.In September 1983, after Soviet forces shot down Korean Air Lines Flight 007 when it strayed into restricted airspace, then US President Ronald Reagan announced that the military’s satellite-based Global Positioning System would eventually be opened to civilian use.
Developed at the height of the Cold War, GPS was designed by the Pentagon to give US forces an unfailing sense of position anywhere on Earth. By the 1991 Gulf War, it was guiding tanks across the desert, naval vessels across the seas, and precision munitions onto targets. In the decades since, the technology has diffused into daily life — powering smartphones, ride-hailing apps, agriculture, stock exchanges, and the precise time-stamping of financial trades. From the outset, defense planners also knew GPS carried a fatal flaw: its faint signals could be jammed or spoofed with relative ease. In any conflict with a peer adversary such as Russia or China, satellite navigation would likely be among the first capabilities to vanish. That risk has recently moved beyond theory. On Aug. 31–Sept. 1, European officials confirmed that a flight carrying Commission President Ursula von der LeyenThese vulnerabilities have haunted Pentagon planners for years. And now, DARPA, the Defense Advanced Research Projects Agency, the Pentagon’s moonshot lab, believes it has found a way to escape it.contracts totaling about US$24.4 million to Sydney-based startup Q-CTRL under its Robust Quantum Sensors program. The initiative aims to build quantum navigation systems that operate without satellites and can withstand the noise and turbulence of combat environments.GPS satellites orbit 12,500 miles above Earth, each broadcasting faint timing signals from atomic clocks. Receivers compare those signals to triangulate position. It’s a marvel of precision timing and orbital mechanics. But because the signals are so faint, they can be drowned out by cheap jammers or replaced by counterfeit ones. In Ukraine, Russian forces routinely jam GPS to disorient drones and artillery. In the South China Sea, ships have been mocked into false locations. In the Middle East, US pilots have complained of degraded signals near Iranian and Syrian airspace.For decades, the Pentagon’s fallback has been inertial navigation systems , which use gyroscopes and accelerometers to track motion without external signals. But even the best drift over time. An aircraft flying without GPS can accumulate miles of error in just hours. What the Pentagon wants is a navigation system that is both precise and untouchable – something no jammer, no satellite killer, no adversary can degrade. Quantum sensors offer exactly that promise. Instead of tracking motion through mechanical or optical gyros, they exploit the extreme sensitivity of atoms cooled and trapped by lasers. By watching how matter waves interfere under acceleration or gravity, they can measure forces directly with astonishing precision. “Quantum systems can measure the fundamental forces of nature directly,” Biercuk said. “That means they don’t need an external reference like a satellite. They can give you navigation that’s resilient against jamming or spoofing.” But there’s a catch: quantum systems are notoriously fragile. Atoms decohere when exposed to vibration, heat, or electromagnetic noise. In labs, they live in delicate vacuum chambers, shielded from interference, coaxed into stability by teams of physicists. Strapping one into a fighter jet pulling 9g’s or a submarine under pressure has been unthinkable. That’s where DARPA’s RoQS program comes in. The mandate is simple and brutal: to take fragile lab toys and make them battlefield-ready.Q-CTRL’s answer is what it calls software ruggedization. Instead of trying to build bigger shields, it programs the quantum hardware itself to survive the noise. “Quantum sensors have traditionally been fragile, requiring isolation from vibration and electromagnetic noise,” Biercuk explained. “Q-CTRL has specialized in developing new software techniques that suppress noise in operation and signal processing. Our approach combines physics insight with constrained AI/ML to find noise suppression solutions without massive data training efficiently.” Ironstone Opal is a compact and powerful quantum navigation system that delivers GPS-like navigation without GPS for deployment in drones, autonomous cars, and airliners. Credit:The technique uses sequences of laser pulses, effectively software instructions, to manipulate atoms in ways that cancel out environmental interference. The algorithms are tuned with AI models informed by physics, allowing the sensors to adapt in real time without massive data training.In airborne trials, Q-CTRL’s magnetic navigation system worked without any in-flight calibration maneuvers, a first. “We realized successful magnetic navigation with robustness against changing payloads and flight paths,” Biercuk said. The proof came in trials of Q-CTRL’s Ironstone Opal system. Against a top-tier inertial navigation system, the quantum sensor delivered 111 times greater positioning accuracy in GPS-denied conditions. “These field trials represent the first time a quantum navigation system has been demonstrated to outperform its classical counterparts,” Biercuk said. The leap came from noise suppression. By filtering out vibrations and electromagnetic interference, Ironstone Opal maintained accuracy without the recalibration classical systems require. For DARPA, it was the kind of performance demonstration that moves a technology from promise to plausibility.For DARPA, navigation has always been existential. The agency was founded in 1958, after the Soviet launch of Sputnik shocked the US into realizing it had been technologically outpaced. In the 1970s, DARPA began experimenting with satellite navigation systems to give US submarines and bombers a strategic edge. That project became GPS. Today, DARPA’s calculus is similar: adversaries have found GPS’s soft underbelly, and the Pentagon needs to leap ahead again. “Delivering quantum sensors rugged enough to work on the most dynamic platforms and ready for full integration into military vehicles is the DARPA-hard challenge,” Biercuk said. The partnership with Lockheed Martin, which has decades of experience in navigation and GPS, reflects the seriousness of the push. If Q-CTRL’s systems can be fielded across aircraft, ships, and ground vehicles, they could give US forces a decisive resilience that adversaries cannot jam away.“Our solution is a complement and backup to GPS. It is most certainly not envisioned as a replacement,” he said.coverage when available. Quantum sensors take over when signals are jammed or denied. Layered together, they make navigation robust against any single point of failure.The Pentagon may be footing the bill, but quantum navigation’s uses stretch far beyond warzones. NASA and the US Geological Survey are already exploring it for subsurface mapping and mineral prospecting. “Fortunately, the systems can translate easily between missions with only software changes,” Biercuk said. “Instead of matching to an existing map, we only need to create one.” That potential is drawing attention across US science agencies. “USGS, NASA, and other Federal Agencies are exploring how to use the emerging generation of highly capable, mobile quantum sensors to detect and assess mineral deposits, and to map out detailed subsurface patterns for GNSS-denied navigation,”“DARPA’s awards to Q-CTRL illustrate the potential for impactful new use of this technology, and NASA looks forward to pursuing a deeper relationship with Q-CTRL.” That dual-use potential mirrors GPS’s trajectory. Born as a military tool, GPS is now a pillar of global commerce. Quantum navigation could follow the same path, starting in submarines and ending in smartphones. But the challenges remain. Quantum gravimeters, devices that sense gravitational fields, are still bulky and power-hungry. “Continuing to reduce SWaP, especially for quantum gravimeters, is a major challenge and one we are attacking aggressively in our DARPA programs,” Biercuk said. Platform diversity also complicates scaling. A submarine’s environment is nothing like a fighter jet’s. But Biercuk argues Q-CTRL’s software solves that. “Our quantum navigation software is agnostic of the underlying sensing modality and will be used across platforms,” he said. “The specific sensor choice will be determined by operating theater and SWaP constraints.” Every navigation revolution has had its moonshot moment. Sextants unlocked oceanic exploration. Radio navigation transformed aviation. GPS reshaped war and peace alike.Quantum navigation’s moonshot may be coming soon. DARPA’s RoQS program aims to move from lab demonstrations to deployable systems. If Q-CTRL, DARPA, and Lockheed succeed, quantum sensors could become standard US defense platform kits within the next decade. “The DARPA-hard challenge in the RoQS program is delivering quantum sensors that are rugged enough to work on the most dynamic platforms and ready for full integration into military vehicles,” Biercuk said. “We’re excited to deliver magnetometers and gravimeters ruggedized with software for the most challenging DoD missions.”As China develops anti-satellite weapons and Russia perfects electronic warfare tactics, the US military is making a strategic bet on navigation systems that adversaries cannot silence. The recent interference with the European Commission President’s aircraft showed how quickly GPS denial can shift from nuisance to geopolitical signal. If jamming a head of state’s flight is possible, so is disrupting a humanitarian airlift, a naval convoy, or a swarm of autonomous drones. That is the world DARPA and Q-CTRL are preparing for: one where a quantum compass may be the only way to know where you stand.Kapil Kajal is an award-winning journalist with a diverse portfolio spanning defense, politics, technology, crime, environment, human rights, and foreign policy. His work has been featured in publications such as Janes, National Geographic, Al Jazeera, Rest of World, Mongabay, and Nikkei. Kapil holds a dual bachelor's degree in Electrical, Electronics, and Communication Engineering and a master’s diploma in journalism from the Institute of Journalism and New Media in Bangalore.
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