Researchers at the University of Colorado Boulder have developed a groundbreaking technique using trapped vapor atoms as highly precise compasses for measuring magnetic fields. This method allows for simultaneous measurement of both the strength and direction of magnetic field variations, opening up new possibilities for quantum sensor technology.
Researchers at the University of Colorado Boulder have made a significant advance in magnetic field measurement. They have developed a new technique that uses atoms as highly precise compasses. It has the potential to revolutionize quantum sensor technology.
The research demonstrates the capabilities of trapped vapor atoms. These atoms can simultaneously measure minute variations in magnetic field strength and direction. This combined measurement capability is essential for many applications.“Atoms can tell you a lot,” said Cindy Regal, a physics professor and JILA fellow.“We’re data mining them to glean simultaneously whether magnetic fields are changing by extremely small amounts and what direction those fields point.”Challenges of measuring magnetic fieldsMagnetic fields are ubiquitous. They are generated by the Earth’s core. They are also produced by the electrical activity of the human brain. However, accurately measuring the direction of these fields is challenging. This is particularly true for atomic sensors. Current technologies, like optically pumped magnetometers , are capable of measuring field strength. However, determining direction, especially in unshielded environments, presents a significant obstacle. Traditional calibration methods, which utilize metal coils, also have limitations. These coils are susceptible to degradation and distortion, which can compromise accuracy.Using microwave antenna as referenceThe CU Boulder team used a small chamber containing billions of rubidium atoms in a vapor state. When a magnetic field is applied, the atoms undergo energy shifts. The researchers used a laser to measure these shifts precisely. This allowed them to determine the field’s orientation. “You can think of each atom as a compass needle,” explained Dawson Hewatt, a graduate student in Regal’s lab at JILA.“And we have a billion compass needles, which could make for really precise measurement devices.”A key innovation in their approach is the use of a microwave antenna as a reference, leveraging the inherent stability of atoms to maintain calibration over time. “If you zap one of the team’s atoms with a microwave signal, its internal structure will wiggle—a sort of atomic dance that can tell physicists a lot,” said the team in a press release.“Ultimately, we can read out those wiggles, which tell us about the strength of the energy transitions the atoms are undergoing, which then tells us about the direction of the magnetic field,” added Regal.It eliminates the problems associated with traditional calibration techniques. “Atoms are always the same,” Regal notes. This fundamental characteristic makes them highly suitable for advanced sensing applications.Accuracy and potential applicationsThe team achieved a high degree of accuracy in their experiments. They were able to determine the orientation of a magnetic field to an accuracy of nearly one-hundredth of a degree. While further refinement is necessary, the potential applications are substantial. The researchers suggest that these atomic compasses could be used for brain imaging and even navigation purposes, among others.“It’s now a question of: ‘How far can we push these atomic systems?’” concluded Svenja Knappe, a research professor at the Paul M. Rady Department of Mechanical Engineering.
QUANTUM SENSORS ATOMIC COMPASSES MAGNETIC FIELD MEASUREMENT BRAIN IMAGING NAVIGATION
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