As cities continue to expand and grow denser, traditional navigation systems, which rely heavily on satellite signals, are increasingly challenged by urban canyons, underground environments, and interference. These obstacles lead to a loss of accuracy in positioning, affecting everything from autonomous vehicles to pedestrian navigation within large buildings. The quantum compass, a breakthrough in quantum technology, offers a solution to these limitations, promising precise navigation without the need for external signals.
The quantum compass, also called a quantum gyroscope or quantum inertial navigation system, operates based on the principles of quantum mechanics. It measures minute changes in atomic states caused by movement, allowing it to determine orientation and position with unparalleled precision. Unlike GPS, which requires satellites and can be disrupted by environmental factors, the quantum compass is entirely self-contained. It functions independently of external signals, making it particularly valuable in environments where GPS is unreliable or unavailable, such as deep urban centres, tunnels, or even underwater.
The technology works by using cold atoms or other quantum particles, which are highly sensitive to changes in motion. These particles are manipulated and measured in such a way that their response to motion can be interpreted as highly accurate data about the device’s position and orientation. The data generated by quantum compasses can be integrated into various urban applications, from enhancing the safety and reliability of autonomous vehicles to improving the efficiency of urban logistics by enabling precise tracking in areas where traditional navigation systems falter.
As urban environments become more complex, the need for reliable, uninterrupted navigation will only increase. This technology offers a robust solution, ensuring that navigation remains accurate regardless of the surrounding environment. Moreover, as cities push towards smarter and more autonomous systems, the quantum compass will be a cornerstone technology, enabling seamless operation across various platforms and in challenging conditions.
The Centre for Cold Matter develops portable quantum accelerometers for navigation without satellite support.
Formerly ColdQuanta; develops quantum atomics for computing and sensing, including RF and inertial sensors.
Develops advanced laser systems and quantum gravimeters/accelerometers for navigation and sensing.
Formed by the merger of iXblue and ECA Group; includes Muquans, a pioneer in quantum gravimetry.
Building 'Gravio', a cold atom interferometry sensor for resource exploration and underground mapping.
Provides infrastructure software for quantum control to suppress errors and improve hardware performance.
A US Department of Energy lab actively researching adiabatic logic circuits and reversible computing to overcome thermodynamic limits in microelectronics.
Develops subsystems and vacuum packages for cold atom quantum sensors, including gravity sensors (CASPA project).
Major defense contractor developing Reciprocal Quantum Logic (RQL) for cryogenic computing.
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A comprehensive review of quantum sensing technologies, including cold atom interferometry and atomic vapour cells, for resilient positioning and navigation in GNSS-denied environments.
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Quantum sensors for enhanced positioning and navigation: a comprehensive reviewGPS Solutions · Feb 2, 2026
A comprehensive review of quantum sensing technologies, including cold atom interferometry and nitrogen-vacancy centers, for absolute, drift-free positioning in GNSS-denied environments.
News
New quantum-based navigation system 50 times more accurate than traditional GPSTech Xplore · Apr 21, 2025
Q-CTRL demonstrates 'Ironstone Opal,' a quantum navigation system showing high accuracy in real-world trials, referencing a related arXiv preprint (DOI: 10.48550/arxiv.2504.08167).
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System architecture of the MagNav system used in the trialsarXiv · Apr 1, 2025
Describes the system architecture and real-world demonstration of a quantum navigation system (Ironstone Opal) that showed significantly higher accuracy than traditional systems in GNSS-denied tests.
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New quantum-based navigation system 50 times more accurate than traditional GPSTech Xplore · Apr 21, 2025
Q-CTRL demonstrated a quantum navigation system called 'Ironstone Opal' that maintains high accuracy without GPS, validated through reported field trials.
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Quantum sensing technologies provide future cities with unimaginable techniques for solving their complex problems. Quantum sensors, through the utilization of quantum effects such as superposition, entanglement, and tunneling, can provide an unmatched level of sensitivity, precision, and durability against traditional sensing technologies. This study explores the potential applications of quantum sensing in four critical urban infrastructure domains: water, energy, transport, and construction. Throughout this study, we determine the most promising quantum sensing technologies for each domain. Besides, we discuss the technical progress of these sensors and the advantages they have in comparison with classical devices, as well as the organizational issues cities can face when implementing these sensors. Our results indicate that quantum sensing will be a critical enabler of future smart cities, generating advanced monitoring, control, and decision-making capabilities across various sectors. Nevertheless, taking advantage of this potential will demand the close partnership of cities, industry, academia, and policymakers to guide the complicated adoption process.
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The road (or route!) ahead is quantum, and it promises to be an exciting journey.
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Adaptable Navigation Systems (ANS) (Archived)darpa.mil
The military relies heavily on the Global Positioning System (GPS) for positioning, navigation, and timing (PNT), but GPS access is easily blocked by methods such as jamming. In addition, many environments in which our military operates (inside buildings, in urban canyons, under dense foliage, underwater, and underground) have limited or no GPS access. To solve this challenge, Adaptable Navigation Systems (ANS) seeks to provide GPS-quality PNT to military users regardless of the operational environment.
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Navigation-Compatible Hybrid Quantum Accelerometer Using a Kalman Filterjournals.aps.org
Long-term inertial navigation is currently limited by the bias drifts of gyroscopes and accelerometers and ultrastable cold-atom interferometers offer a promising alternative for the next generation of high-end navigation systems. Here, we present an experimental setup and an algorithm hybridizing a stable matter-wave interferometer with a classical accelerometer. We use correlations between the quantum and classical devices to track the bias drift of the latter and form a hybrid sensor. We apply the Kalman-filter formalism to obtain an optimal estimate of the bias and simulate experimentally a harsh environment representative of that encountered in mobile sensing applications. We show that our method is more precise and robust than traditional sine-fitting methods. The resulting sensor exhibits a 400-Hz bandwidth and reaches a stability of 10 ng after 11 h of integration.
Article
Quantum Compass Could Replace GPSperplexity.ai
Scientists at Imperial College London are testing a "quantum compass" in the London Underground, a technology that could potentially replace or complement GPS for navigation in challenging environments. This device uses supercooled atoms and quantum mechanics to measure movement with extreme precision, offering a self-contained alternative to satellite-dependent positioning systems.
