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I discuss in general terms the ideas behind the manuscript "Single-ion quantum lock-in amplifier" by Kotler and colleagues which is scheduled to be published in the journal Nature. The Kotler manuscript describes a generalization of the concept of lock-in detection to a quantum probe. The authors experimentally demonstrate the quantum lock-in technique using a probe consisting of the valence electron spin of a single trapped strontium ion.
Bollinger, J.
(2011),
Filtering noise with a quantum probe, Nature, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=908356
(Accessed December 2, 2023)