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DTSTART:20260329T030000
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DTSTAMP:20260426T074923Z
UID:6964b0d50ce98040791463@ist.ac.at
DTSTART:20260211T111500
DTEND:20260211T121500
DESCRIPTION:Speaker: Emily Davis\nhosted by Onur Hosten\nAbstract: Spin squ
 eezed states provide a seminal example of how the structure of quantum mec
 hanical correlations can be controlled to produce metrologically useful en
 tanglement. Such squeezed states have been demonstrated in a wide variety 
 of artificial quantum systems ranging from atoms in optical cavities to tr
 apped ion crystals. By contrast\, despite their numerous advantages as pra
 ctical sensors\, spin ensembles in solid-state materials have yet to be co
 ntrolled with sufficient precision to generate targeted entanglement such 
 as spin squeezing. In this work\, we present the first experimental demons
 tration of spin squeezing in a solid-state spin system. Our experiments ar
 e performed on a strongly-interacting ensemble of nitrogen-vacancy (NV) co
 lor centers in diamond at room temperature and squeezing (-0.5 pm 0.1 dB) 
 is generated by the native magnetic dipole-dipole interaction between NVs.
  In order to generate and detect squeezing in a solid-state spin system\, 
 we overcome a number of key challenges of broad experimental and theoretic
 al interest. First\, we develop a novel approach\, using interaction-enabl
 ed noise spectroscopy\, to characterize the quantum projection noise in ou
 r system without directly resolving the spin probability distribution. Sec
 ond\, noting that the random positioning of spin defects severely limits t
 he generation of spin squeezing\, we implement a pair of strategies aimed 
 at isolating the dynamics of a relatively ordered sub-ensemble of NV cente
 rs. Our results open the door to entanglement-enhanced metrology using mac
 roscopic ensembles of optically-active spins in solids.
LOCATION:Office Bldg West / Ground floor / Heinzel Seminar Room (I21.EG.101
 )\, ISTA
ORGANIZER:swiddman@ist.ac.at
SUMMARY:Emily Davis: Spin squeezing in an ensemble of nitrogen-vacancy cent
 ers in diamond
URL:https://talks-calendar.ista.ac.at/events/6240
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