3D Printing Helps Ultracold Quantum Experiments Go Small


To find some of the coldest objects in the universe, you don’t have to go much further than your local university. There, a physicist may be using laser light and magnets to cool atoms below a stunning –450 Fahrenheit. They might use these ultracold atoms to sense even the weakest magnetic fields in the room, or to build a clock accurate to within a quadrillionth of a second. But they probably could not take these sensors or clocks outside of their lab, as they tend to be large and fragile.

Now, a team of physicists at the University of Nottingham have shown that 3D-printing parts for these ultracold quantum experiments allows them to shrink their apparatus to just a third of its usual size. Their work, published in the journal Physical Review X Quantum in August, could open the door to a quicker and more accessible way to make smaller, more stable, customized setups for experiments.

Because they obey the rules of quantum mechanics, extremely cold atoms exhibit new and useful behaviors. “Ultracold atoms are a key technology that goes into a lot of different precision instruments,“ says John Kitching, a physicist at the National Institute of Standards and Technology who was not involved with the study.

“Ultracold atoms are excellent sensors of time. They are excellent sensors of what we call inertial forces, so acceleration and rotation. They are excellent sensors of magnetic fields. And they’re excellent sensors of vacuum,” adds his colleague Stephen Eckel, who was also not involved with the work.

Consequently, physicists have long sought to use ultracold atom devices in settings ranging from space exploration, where they could aid in navigation by sensing changes in a vehicle’s acceleration, to hydrology, where they could pinpoint underground water by detecting its gravitational pull aboveground. However, the process of getting atoms cold enough to take on any of these tasks is often complex and arduous. “Having spent a long time as a cold-atoms experimentalist, I’m always really frustrated that we spend all our time fixing technical problems,” says Nathan Cooper, a physicist at the University of Nottingham and one of the coauthors on the study.

The key to cooling and controlling atoms is striking them with finely tuned laser light. Warm atoms zap around at speeds of hundreds of miles per hour, while extremely cold atoms stand nearly still. Physicists make sure that every time a warm atom is hit with a laser beam, the light smacks into it in such a way that the atom loses some energy, slows down, and becomes colder. Typically, they work on a 5- by 8-foot table covered with a maze of mirrors and lenses—optics components—that guide and manipulate the light as it travels toward millions of atoms, often rubidium or sodium, that are kept in a special ultrahigh-vacuum chamber. To control where all the ultracold atoms are in this chamber, physicists use magnets; their fields act like fences.

Compared to miles-long particle accelerators or large telescopes, these experimental setups are small. However, they are way too big and fragile to become commercializable devices for use outside of academic labs. Physicists often spend months aligning every small element in their optics mazes. Even a little shake to the mirrors and lenses—something that is likely to happen in the field—would mean significant work delays. “What we wanted to try and do is build something that’s very quick to make and that will, hopefully, operate reliably,” Cooper says. So he and collaborators turned to 3D printing.

The Nottingham team’s experiment does not take up a whole table—it has a volume of 0.15 cubic meter, which makes it slightly bigger than a stack of 10 large pizza boxes. “It is very, very small. We reduced the size by about 70 percent, compared to a conventional setup,” says Somaya Madkhaly, a graduate student at Nottingham and the study’s first author. To build it, she and her colleagues engaged in something like a very customizable game of Lego. Instead of buying parts, they assembled their setup out of blocks that they 3D-printed to be shaped exactly like they wanted.

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