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Physics
Atomic and Condensed Matter
Entangling atoms in a molecule
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[QUOTE="Twigg, post: 6480414, member: 572426"] I've been out of the loop for a while, but I remember there were groups at [URL='https://tf.nist.gov/general/pdf/3083.pdf']NIST[/URL] and [URL='https://pubmed.ncbi.nlm.nih.gov/26855427/']Hannover[/URL] that did spectroscopic measurements like that. Looks like there's a publication from [URL='https://pubmed.ncbi.nlm.nih.gov/26855427/']Basel[/URL] too in recent times. The technique you describe is called quantum logic spectroscopy. When I was in precision measurement, we would half-heartedly talk about pros and cons of using quantum logic. The biggest disadvantage is that you reduce your sample size to N=1. More molecules is more better for statistical reasons, especially in precision measurement. Quantum logic spectroscopy only pays off if your one entangled atom/molecule is more sensitive on its own than averaging down on a whole gas. There are cases where it pays off, like [URL='https://arxiv.org/abs/1902.07694']NIST's aluminum ion clock[/URL] which is a more precise timekeeper than [URL='https://jila.colorado.edu/sites/default/files/2020-08/Bothwell_2019_Metrologia_56_065004.pdf']JILA's strontium lattice clock[/URL] with its 1000 strontium atoms. Also, please keep in mind that with molecules just preparing a single unentangled quantum state is cause for [I]several[/I] bottles of champagne. [/QUOTE]
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Entangling atoms in a molecule
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