News & Research Highlights

In the vast stretches between solar systems, heat does not flow and sound does not exist. Action seems to stop, but only if you don’t look long enough. Violent and chaotic actions occur in the long stretches of outer space. These chemical reactions between radicals and ions are the same reactions underlying the burn of a flame and floating the ozone above our planet. But they’re easy to miss in outer space because they’re very rare.

JILA Fellows Dr. Tom Perkins and Dr. Konrad Lehnert both received medals from the Department of Commerce last night at the Ronald Reagan Amphitheater in Washington, D.C. Dr. Perkins received the Gold Medal, which is the highest honorary award given by the United States Department of Commerce, or DOC. Perkins was recognized for creating the world’s best atomic force microscope tailored to biological measurements. This device can “grab” onto biological molecules, such as proteins, and measure the tiny forces involved in their folding and unfolding.

Quantum computers are set to revolutionize society. With their expansive power and speed, quantum computers could reduce today’s impossibly complex problems, like artificial intelligence and weather forecasts, to mere algorithms. But as revolutionary as the quantum computer will be, its promises will be stifled without the right connections. Peter Burns, a JILA graduate student in the Lehnert/Regal lab, likens this stifle to a world without Wi-Fi.  

With the advent of the laser, the fuzzy bands glowing from atoms transformed into narrow lines of distinct color. These spectral lines became guiding beacons visible from the quantum frontier. More than a half century later, we stand at the next frontier. The elegant physics that will decode today’s mysteries (such as dark matter, dark energy, and the stability of our fundamental constants, to name a few) is still shrouded in shadows. But a new tool promises illumination. 

JILA Jun Ye hit the big screen this summer as he debuted in the feature-length documentary, “The Most Unknown”.

“The Most Unknown” brings together nine scientists from across the globe, all of whom are using science to answer deep philosophical questions, such as how did life begin, and what is time? The scientists are brought together, (“blind-date style,” as the New Yorker’s review accurately describes it) to discuss how their work from various fields might overlap.

The chaos within a black hole scrambles information. Gravity tugs on time in tiny, discrete steps. A phantom-like presence pervades our universe, yet evades detection. These intangible phenomena may seem like mere conjectures of science fiction, but in reality, experimental comprehension is not far, in neither time nor space. Astronomical advances in quantum simulators and quantum sensors will likely be made within the decade, and the leading experiments for black holes, gravitons, and dark matter will be not in space, but in basements – sitting on tables, in a black room lit only by lasers.

JILA Fellow Cindy Regal has been named a 2018 Alexander M. Cruickshank Lecturer by the Gordon Research Conferences (GRC). This prestigious title is given worldwide to scientists at the top of their fields in the physical, chemical, and biological sciences. 

The hardest problems are never solved by one person. They are solved by teams; or in the case of science, collaborations. It took a collaboration of 17 researchers, including four JILA fellows and another six JILA affiliates, just a little over five years to achieve robust polarization control over isolated attosecond (one billionth of a billionth of a second) pulses of extreme-ultraviolet light. 

A large fraction of JILA research relies on laser cooling of atoms, ions and molecules for applications as diverse as world-leading atomic clocks, human-controlled chemistry, quantum information, new forms of ultracold matter and the search for new details of the origins of the universe. JILAns use laser cooling every day in their research, and have mastered arcane details of the process.

JILA researchers have created a laser-controlled "electron faucet", which emits a stable stream of low-energy electrons. These faucets have many applications for ultrafast switches and ultrafast electron imaging. The electron faucet starts with gold, spherical nanoshells. “They are glass cores with a thin, gold layer over them,” said Jacob Pettine, the graduate student on the project. These nanoshells are truly on the nanoscale, measuring less than 150 nanometers in diameter, which is “something like a thousandth of the size of a human hair,” said Pettine.

“Well, this isn’t going to work.” That was recent JILA graduate Carrie Weidner’s first thought when her advisor, JILA Fellow Dana Anderson, proposed the difficult experiment: to build an interferometer unlike any before – an interferometer of shaking atoms. But the grit paid off, as this compact and robust interferometer outperforms all others in filtering and distinguishing signal direction. While the designs of most atom interferometers are symmetric and elegant, Weidner says the shaken-lattice experiment proposed by Anderson “is more like broken eggs.”

We all know what a tenth of a second feels like. It’s a jiffy, a snap of the fingers, or a camera shutter click. But what does 14 billion years–the age of the universe–feel like? JILA’s atomic clock has the precision to measure the age of the universe to within a tenth of a second. That sort of precision is difficult to intuit. Yet, JILA’s atomic clock, which is the most precise clock in the world, continues to improve its precision. The latest jump in precision, of nearly 50 percent, came about from a new perspective.

JILA Fellow Jun Ye was named the 2018 winner of the I. I. Rabi Award by the IEEE Frequency Control Symposium. Ye was recognized “for the development of stabile, reproducible, and accurate atomic clocks based on optical lattices, and the use of those clocks to probe fundamental atomic interactions and quantum many-body systems.”

Magnets hold cards to your fridge, and store data in your computer. They can power speakers, and produce detailed medical images. And yet, despite millennia of use, and centuries of study, magnetism is still far from fully understood.

The reaction, at first glance, seems simple. Combustion engines, such as those in your car, form carbon monoxide (CO). Sunlight converts atmospheric water into a highly reactive hydroxyl radical (OH). And when CO and OH meet, one byproduct is carbon dioxide (CO₂) ­– a main contributor to air pollution and climate change.

The Chinese Academy of Sciences announced on November 29, 2017 the election of JILA Fellow Jun Ye as a Foreign Member, China’s highest honor for foreign scientists: The Chinese Academy of Sciences (CAS) promotes scientific and technological advances across the world. CAS includes a network of more than 100 research and development organizations across the world; three universities; and a traditional merit-based academy analogous to the US National Academy of Sciences to recognize and convene scientific leaders from across the world.

The actors are molecules. The plot, broken molecular bonds. JILA Fellow Ralph Jimenez and a team of detector experts at the National Institute of Standards and Technology (NIST) are working together to make X-ray movies of a molecular drama. The team at NIST built a microcalorimeter X-ray spectrometer capable of performing time-resolved spectroscopy; in other words: a camera to film molecules. They use this camera to learn how molecules break their bonds – do the ­electrons rearrange, do the other atoms quake?

Why are we here? This is an age-old philosophical question. However, physicists like Will Cairncross, Dan Gresh and their advisors Eric Cornell and Jun Ye actually want to figure out out why people like us exist at all. If there had been the same amount of matter and antimatter created in the Big Bang, the future of stars, galaxies, our Solar System, and life would have disappeared in a flash of light as matter and antimatter recombined.

Newly minted JILA Ph.D. Catherine Klauss and her colleagues in the Jin and Cornell group decided to see what would happen to a Bose-Einstein condensate of Rubidium-85 (⁸⁵Rb) atoms if they suddenly threw the whole experiment wildly out of equilibrium by quickly lowering the magnetic field through a Feshbach resonance.