Journal
SCIENCE
Volume 357, Issue 6349, Pages 372-375Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aal5066
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Funding
- NSF
- Air Force Office of Scientific Research (AFOSR) Presidential Early Career Award for Scientists and Engineers
- U.S. Army Research Office (ARO)
- ARO Multidisciplinary University Research Inititative (MURI) on High-Resolution Quantum Control of Chemical Reactions
- AFOSR MURI on Exotic Phases of Matter
- David and Lucile Packard Foundation
- NSF Graduate Research Fellowship Program
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Coherence, the stability of the relative phase between quantum states, is central to quantum mechanics and its applications. For ultracold dipolar molecules at sub-microkelvin temperatures, internal states with robust coherence are predicted to offer rich prospects for quantum many-body physics and quantum information processing. We report the observation of stable coherence between nuclear spin states of ultracold fermionic sodium-potassium (NaK) molecules in the singlet rovibrational ground state. Ramsey spectroscopy reveals coherence times on the scale of 1 second; this enables high-resolution spectroscopy of the molecular gas. Collisional shifts are shown to be absent down to the 100-millihertz level. This work opens the door to the use of molecules as a versatile quantum memory and for precision measurements on dipolar quantum matter.
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