Quantum Information Science & Technology
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.
This year’s Q2B (Quantum 2 Business) conference took place on December 7-9 at the Santa Clara Convention Center. Several big names spoke at the event, and it was a place to forge new partnerships and connections. For one lucky JILAn, the trip to this conference was sponsored by CUbit Quantum Initiative, (CUbit). "I am very grateful to Women in Quantum and CUbit for sponsoring me to attend the Q2B conference," Joanna Lis said. Lis is a graduate student within JILA Fellow Adam Kaufman's laboratory. "My research is looking at neutral atoms in tweezers. I was positively surprised on how much presence neutral atom platforms had within the conference," she added.
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.
How atoms interact with light reflects some of the most basic principles in physics. On a quantum level, how atoms and light interact has been a topic of interest in the worldwide scientific community for many years. Light scattering is a process where incoming light excites an atom to a higher-lying energy state from which it subsequently decays back to its ground state by reemitting a quantum of light. In the quantum realm, there are many factors that affect light scattering. In a new paper published in Science, JILA and NIST Fellow Jun Ye and his laboratory members report on how light scattering is affected by the quantum nature of the atoms, more specifically, thequantum statistical rule such as the Pauli Exclusion Principle.
Gravimetry, or the measurement of the strength of a gravitational field (or gravitational acceleration), has been of great interest to physicists since the 1600s. One of the most precise ways to measure gravitational acceleration is to use an atom interferometer. There are many different types of atom interferometers but so far all operate using uncorrelated atoms that are not entangled. To build the best one allowed in nature, it requires harnessing the power of quantum entanglement. However, making a quantum interferometer with entangled atoms is challenging. JILA Fellows Ana Maria Rey and James K. Thompson have published a paper in Physical Review Letters that discusses a new protocol that could make entangled quantum interferometers easier to produce and use.
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!
ÃÛÌÒ´«Ã½Æƽâ°æÏÂÔØ innovators, JILA physicists, and university startup ColdQuanta are featured in a new film from the Colorado Office of Economic Development and International Trade (COEDIT) promoting Colorado's extensive quantum ecosystem.
Quantum channels have their own quirks that make them unique to study. In a new paper published in Nature Communications, post-doctoral researcher Vikesh Siddhu of JILA Fellow Graeme Smith's team looked at some of the logistics in using quantum channels to send information. Siddhu analyzed how noise occurring in a quantum channel affects the information it communicates.