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BEGIN:VEVENT
SUMMARY:Seminar\, So Chigusa 千草颯 (MIT)
DTSTART;VALUE=DATE-TIME:20251219T043000Z
DTEND;VALUE=DATE-TIME:20251219T053000Z
UID:908600975583
DESCRIPTION:Title: Noise-resilient quantum sensing for dark matter searche
 sAbstract: Quantum sensors offer exquisite sensitivity to feeble signals\,
  but this sensitivity also makes them vulnerable to unwanted disturbances\
 , which obscure the quantities of interest. This limitation is particularl
 y severe in dark-matter searches\, where signals may be weak\, slowly vary
 ing\, or poorly characterized in frequency.In this talk\, (a) I will prese
 nt a noise-resilient sensing scheme that decouples a target DC field from 
 both DC and AC magnetic noise. The method exploits spin clusters in which 
 the target field and local magnetic fields act differently on individual s
 pins\, enabling the construction of noise-immune observables. I discuss el
 ectron–nuclear spin pairs in nitrogen-vacancy centers in diamond as a co
 ncrete example\, with an emphasis on their application to light dark matte
 r searches.(b) I will also briefly discuss how enhanced noise resilience i
 nterfaces with discovery statistics\, in particular the look-elsewhere eff
 ect. In this context\, I provide guidance for identifying regimes in which
  collective measurements are useful and determining optimal measurement st
 rategies.
LOCATION:721
END:VEVENT
BEGIN:VEVENT
SUMMARY:Seminar\, Amaury Micheli (RIKEN iTHEMS)
DTSTART;VALUE=DATE-TIME:20260108T043000Z
DTEND;VALUE=DATE-TIME:20260108T053000Z
UID:302912548493
DESCRIPTION:Title: Quantum correlations in interacting primordial inhomoge
 neities Abstract: The statistical properties of the CMB anisotropies\, re
 flecting the curvature inhomogeneities in the early Universe\, are very we
 ll accounted for by assuming that they emerged from amplified vacuum fluct
 uations. Being the result of a genuine quantum process\, it is natural to 
 wonder which properties of these primordial inhomogeneities are quantum\, 
 and which\, if any\, persisted until their observations despite interacti
 ons that decohered\, i.e. classicalised\, them. I will review the latest p
 rogress on these questions\, emphasising the quantum information approache
 s.References:Martin\, J.\, Micheli\, A.\, &amp\; Vennin\, V. (2022). Disco
 rd and decoherence.Journal of Cosmology and Astroparticle Physics\, 2022(0
 4)\, 051.Micheli\, A.\, &amp\; Peter\, P. (2023). Quantum Cosmological Gra
 vitational Waves? In C. Bambi\, L. Modesto\, &amp\; I. Shapiro (Eds)\, Han
 dbook of Quantum Gravity (pp. 1-66).Micheli\, A.\, Oshima\, Y.\, &amp\; Ta
 kahashi\, T. (2025) Squeezing of cosmological perturbations in presence of
  decoherence\, in preparation
LOCATION:721
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