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The phrase “quantum technology” usually evokes images of futuristic computers tackling seemingly impossible problems, of a potential-rich leap forward almost—but not yet quite—here. Yet some practical applications of quantum technology have arrived (or at least are much more imminent than reality-bending supercomputing), and these applications have much more to do with “sensing” than “computing.”
Quantum sensors use the unusual behavior of atoms, electrons and other quantum systems to make extremely precise measurements. They can detect tiny changes in things such as gravity, magnetic fields, acceleration, time and temperature, sometimes revealing signals that conventional sensors struggle to see. The U.S. National Science Foundation describes them as potentially thousands of times more precise than existing measurement methods in some applications.
This doesn’t mean that quantum sensors are on the verge of replacing every sensor we use today. They are expensive and can be difficult to operate outside of controlled environments. But researchers and companies are already putting them in aircraft, spacecraft, navigation systems and other real-world settings.
Below are five areas where quantum sensing could soon make a noticeable and notable difference.
- Detecting Earthquakes and Changes Underground
Gravity isn’t exactly the same everywhere. Underground water, rock formations, mineral deposits and other geological structures subtly affect the gravitational field. Extremely sensitive quantum gravimeters could potentially detect those variations with much greater precision than conventional equipment.
That could have implications for earthquake and volcanic monitoring, geological surveys and underground mapping. A quantum sensor might detect changes associated with shifting geological structures before they become obvious through other measurements.
Companies such as Nomad Atomics, Atomionics and Exail are already working on quantum gravimetry for geophysical monitoring, geological hazards and subsurface changes, with earthquake and seismic applications among the potential future uses.
That is not to say that a quantum gravimeter is a magic earthquake predictor. Earthquake forecasting remains extraordinarily difficult, but better measurements of what is happening underground could give scientists more information about faults, volcanoes and other geological systems.
The same technology could eventually help map groundwater or locate mineral deposits, essentially giving scientists a more detailed view of the ground beneath us.
- Navigation When GPS Doesn’t Work
GPS is so deeply engrained in modern life that it’s easy to forget how dependent it is on satellites and radio signals. Those signals can be blocked, jammed or spoofed, creating problems for aircraft, ships, autonomous vehicles and military systems.
Quantum sensors offer another approach. Instead of constantly asking satellites where you are, highly sensitive quantum instruments can measure motion, acceleration, gravity or Earth’s magnetic field and use those measurements to determine where you are.
Australian company Q-CTRL is already testing this idea. Its Ironstone Opal system combines quantum sensors and software to provide GPS-free navigation, including demonstrations involving aircraft and ground vehicles.
The realistic vision for the near future isn’t a world without GPS. It’s a world where GPS is just one tool among several and where a plane or autonomous vehicle can continue navigating even if the satellite signal disappears.
- Better Health Care and Medical Imaging
Some of the most interesting sensors can detect extremely small magnetic fields. Since electrical activity in the human body produces magnetic fields, highly sensitive instruments could potentially measure activity in the brain, heart and other organs. This could lead to improved forms of medical imaging and monitoring. QuSpin and Cerca Magnetics are among the companies investigating quantum technologies for applications ranging from brain imaging to the detection of biological processes.
A sensor capable of detecting much weaker signals could give doctors and researchers another way to observe what’s happening inside the body without necessarily relying on conventional imaging techniques.
This area is still developing, so it’s better to think of quantum sensors as a potential new layer of medical diagnostics, rather than an imminent replacement for MRI machines or other established technologies.
- Smarter Infrastructure and Technology
Quantum sensors could eventually make infrastructure more intelligent. For example, sensors embedded around a bridge that can detect miniscule changes in vibration or magnetic fields, helping engineers identify structural problems earlier. Another example is autonomous vehicles that can navigate more reliably in tunnels, cities or other environments where satellite signals are unreliable.
Quantum magnetometers could also detect weak electromagnetic signals. Lockheed Martin and Q-CTRL are just a few of the companies exploring the use of quantum magnetometers for everything from navigation to detecting and identifying radio-frequency signals.
The company Infleqtion, for example, is developing atom-based quantum sensing technologies for radio-frequency sensing and navigation. The company says its systems are being developed for environments where conventional signals can be jammed, spoofed or otherwise difficult to use. The idea is that technology becomes more capable when it can measure more of its environment.
- Exploring Earth and Space
Quantum gravimeters and magnetometers could help survey areas that are difficult or expensive to investigate using traditional equipment. That could include remote regions, the ocean floor and eventually other worlds.
Canadian company SBQuantum is developing diamond-based quantum magnetometers and, in March 2026, launched one into space as part of the U.S. government’s MagQuest Challenge. The goal includes improving measurements of Earth’s magnetic field, which plays an important role in navigation.
Looking further ahead, quantum sensors could be useful for mapping the Moon or Mars, where traditional GPS doesn’t exist. They could help spacecraft navigate, measure gravitational variations or investigate what lies beneath a planet’s surface. And although that’s currently speculative, it follows naturally from what the technology is already being built to do.
The Surprisingly Practical Future of Quantum Sensing
Quantum sensing does not require us to imagine flying cars or teleportation to appreciate its potential.
Rather, they represent the steady, measurable improvement of technologies on which we already depend in the fields of navigation, medical imaging, geological monitoring, infrastructure and scientific measurement.
Significant obstacles remain. Quantum sensors can be sensitive to unwanted vibration, temperature changes and electromagnetic interference, and making them compact, rugged and affordable enough for widespread use remains a major engineering challenge. The Government Accountability Office notes that reliability, cost-effectiveness and manufacturing constraints are among the field’s outstanding challenges.
But that’s also what makes quantum technology interesting. Companies such as Q-CTRL, Infleqtion and SBQuantum aren’t merely proposing theoretical applications; they are working to move quantum sensing out of laboratories and into aircraft, spacecraft and real-world environments.
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