Precision Measurement
Worldwide, many researchers are interested in controlling atomic and molecular interactions. This includes JILA and NIST fellows Jun Ye and Ana Maria Rey, both of whom have spent years researching interacting potassium-rubidium (KRb) molecules, which were originally created in a collaboration between Ye and the late Deborah Jin. In the newest collaboration between the experimental (Ye) and theory (Rey) groups, the researchers have developed a new way to control two-dimensional gaseous layers of molecules, publishing their exciting new results in the journal Science.
In a new paper published in the Journal of Physical Chemistry Letters, Jimenez and his team report a new experimental setup to search for the cause of a mysterious fluorescent signal that appears to be from entangled photon excitation. The results of their new experiments suggested that hot-band absorption (HBA) by the subject molecules, could be the potential culprit for this mysterious fluorescent signal, making it the prime suspect.
JILA and NIST Fellow Ana Maria Rey is to be inducted into the Colombian Academy of Exact, Physical and Natural Sciences (Academia Colombiana de Ciencias Exactas, Fisicas y Naturales). Fellow Ana Maria Rey has been inducted into the Colombian National Academy of Sciences.  Rey, is a Colombian-American physicist at the University of Colorado, Boulder who "studies the scientific interface between atomic, molecular and optical physics, condensed matter physics and quantum information science."
JILA physicists have measured Albert Einstein’s theory of general relativity, or more specifically, the effect called time dilation, at the smallest scale ever, showing that two tiny atomic clocks, separated by just a millimeter or the width of a sharp pencil tip, tick at different rates. The experiments, described in the Feb. 17 issue of Nature, suggest how to make atomic clocks 50 times more precise than today’s best designs and offer a route to perhaps revealing how relativity and gravity interact with quantum mechanics, a major quandary in physics.
U.S. Rep. Joe Neguse got a first-hand look at the future of ultrafast lasers, record-setting clocks, and quantum computers on the ÃÛÌÒ´«Ã½Æƽâ°æÏÂÔØ campus. Neguse visited the university Thursday to tour facilities at JILA, a research partnership between ÃÛÌÒ´«Ã½Æƽâ°æÏÂÔØ and the National Institute of Standards and Technology (NIST).
In the past month, the group has put up two new preprints.
- In the strontium experiment, we report the generation of entangled Bell states, prepared in optical clock qubits, whose phase coherence persists for more than 4 seconds. This uses a gate scheme proposed by M. Martin and I. Deutsch, based on Rydberg-mediated interactions. See the preprint here.
- On the Ytterbium experiment, we report our first results preparing, controlling, and detecting arrays of nuclear spin qubits of 171Yb. We observe high fidelity control with sub-microsecond pulse times. We also demonstrate low-entropy array preparation through deterministic loading techniques via the use of narrow-line transitions and Raman-sideband cooling to near the motional ground state. See the preprint here.
On December 8th, JILA and NIST Fellow Dr. Judah Levine spoke on his research into internet time service. Internet time service is based on atomic clock technology and is used to help set computer clocks and other devices. The virtual event was hosted by Executive Director Dan Powers of CO-Labs, a coalition of 30+ federally funded Colorado research labs, including JILA. Levine's talk was one in a series discussing the ROI of scientific research.
JILA Graduate Student Andres Villani Davila has been awarded a 2021 "Oustanding Graduate for Research" Award by the University of Colorado Boulder College of Engineering and Applied Sciences. Davila works under JILA Fellow Heather Lewandowski and is pursuing a B.S. in Engineering Physics.
JILA and NIST Fellow Jun Ye has been awarded the 2022 Herbert-Walther-Award from the German Physical Society and OPTICA (formerly OSA). This award recognizes distinguished contributions in quantum optics and atomic physics as well as leadership in the international scientific community.
JILA and NIST Fellow Jun Ye has been named a 2021 Clarivate Highly Cited Researcher. This means that Ye is one of the 0.1%, of the world's researchers who receive this title. Clarivate™ is a data analytics company that identifies the world’s most influential researchers ─ the select few who have been most frequently cited by their peers over the last decade. Ye’s many published papers over the last year have been ranked in the top 1% by citations for field and year in the Web of Science™, according to Clarivate. Well done Dr. Ye!