NIST Researchers Make Breakthrough in Atomic Communications Research
Tuesday, April 06, 2021 | Comments

Researchers at the National Institute of Standards and Technology (NIST) and collaborators demonstrated an atom-based sensor that can determine the direction of an incoming radio signal, another key part for a potential atomic communications system that could be smaller and work better in noisy environments than conventional technology.

NIST researchers previously demonstrated that the same atom-based sensors can receive commonly used communications signals. The capability to measure a signal’s angle of arrival helps ensure the accuracy of radar and wireless communications, which need to sort out real messages and images from random or deliberate interference.

“This new work, in conjunction with our previous work on atom-based sensors and receivers, gets us one step closer to a true atom-based communication system to benefit 5G and beyond,” said project leader Chris Holloway.

In NIST’s experimental setup, two differently colored lasers prepared gaseous cesium atoms in a tiny glass flask, or cell, in high-energy states, which have novel properties such as extreme sensitivity to electromagnetic fields. The frequency of an electric field signal affects the colors of light absorbed by the atoms.

An atom-based “mixer” then took input signals and converted them into different frequencies. One signal acted as a reference while a second signal is converted or “detuned” to a lower frequency. Lasers probe the atoms to detect and measure differences in frequency and phase between the two signals. Phase refers to the position of electromagnetic waves relative to one another in time.

The mixer measured the phase of the detuned signal at two different locations inside the atomic vapor cell. Based on the phase differences at these two locations, researchers could calculate the signal’s direction of arrival.

To demonstrate this approach, NIST measured phase differences of a 19.18 GHz experimental signal at two locations inside the vapor cell for various angles of arrival. Researchers compared these measurements to both a simulation and a theoretical model to validate the new method. The selected transmission frequency could be used in future wireless communications systems, Holloway said.

The work is part of NIST’s research on advanced communications, including 5G, many of which will be much faster and carry far more data than today’s technologies. The sensor research is also part of the NIST on a Chip program, which aims to bring world-class measurement-science technology from the lab to users anywhere and anytime. Co-authors of the study are from the University of Colorado Boulder and ANSYS in Boulder, Colorado.

Atom-based sensors in general have many possible advantages, notably measurements that are both highly accurate and universal, that is, the same everywhere because the atoms are identical. Measurement standards based on atoms include those for length and time.

With further development, atom-based radio receivers may offer many benefits over conventional technologies. For example, there is no need for traditional electronics that convert signals to different frequencies for delivery because the atoms do the job automatically. The antennas and receivers can be physically smaller, with micrometer-scale dimensions. In addition, atom-based systems may be less susceptible to some types of interference and noise.

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