Constanza M. Vidal Bustamante
One of the most consequential national security contests now unfolds on battlefields invisible to the naked eye—across the faint radiofrequency signals of the Global Positioning System (GPS) and within the quantum states of individual atoms. At stake are America’s positioning, navigation, and timing (PNT) capabilities, the foundation for precise geolocation,
trajectory planning, and time synchronization across military, civilian, and commercial domains. For decades, the U.S.-invented GPS has served as the backbone of the world’s PNT, but the system’s inherent vulnerabilities have come into stark relief as adversaries increasingly jam and spoof its weak signals and build weapons to take down its satellites. GPS interference already undermines military operations and disrupts up to thousands of commercial flights daily; broader attacks could trigger catastrophic mission failures and widespread disruption of critical infrastructure, inflicting economic losses exceeding $1 billion a day.1
In the face of rising threats to traditional PNT, quantum sensors offer a compelling alternative. Leveraging the immutable properties of atoms, these devices offer unmatched measurement precision, long-term accuracy,
and reliable operation in contested environments—capabilities that can back up and even outperform current GPS-based services. Quantum sensors could enable resilient U.S. PNT within a few years—from the navigation of submarines, drones, and munitions to the synchronization of telecommunications networks, power grids, and financial systems—but only if America continues to develop and deploy the technology.
While atomic clocks—the most mature quantum technology today—already power GPS, emerging quantum sensing capabilities are beginning to show their promise as local sources of high-precision, resilient PNT. Next-generation atomic clocks can sustain timing accuracy over longer durations. Quantum accelerometers and gyroscopes can measure a moving platform’s velocity and rotation with greater precision.
Quantum gravimeters and magnetometers can reference the Earth’s unique gravitational and magnetic fields for stealthy positioning. All of these technologies offer enhanced performance without relying on vulnerable radiofrequency signals.
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