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Nows at #MCQS, Rafał Demkowicz-Dobrzański from (@UniWarsawski ) on the grand unified theory of quantum metrology.
#LTQI
Rafał Demkowicz-Dobrzański seez quantum metrology as a channel estimation problem. The channel U_φ is given, one optimizes the state sent and the measurement.
#LTQI #MCQS
Rafał Demkowicz-Dobrzański: The Cramer-Rao bount gives limit on the variance Δ²φ≥1/F of an unbiased estimator., where F is the (Quantum or classical) Fisher information, defined in term of derivatives of probability/kets over φ
#LTQI #MCQS
Read 18 tweets
Now at #QuPa (at @InHenriPoincare), Bruno Laburthe-Tolra from @univ_paris13 on “Some aspects of quantum simulation using cold atoms”
#LTQI
@InHenriPoincare @univ_paris13 Bruno Laburthe-Tolra: works with quantum gases, with density 10¹²–10¹⁵ at/cm³, at nK or µK, with de Broglie wavelengths and inter-atomic distance > 100nm.
These systems (boson or fermions) are “clean” analogues of condensed matter systems.
#QuPa #LTQI
@InHenriPoincare @univ_paris13 Bruno Laburthe-Tolra: Optical lattices are periodic (spin indeendent) potentials induced by stationary optical waves. This allows to make 1D, 2D and 3D potential, making 2D, 1D and strongly correlated spin gases.
#LTQI #QuPa
Read 16 tweets

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