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SUMMARY:Quantum metrology in realistic scenarios
DESCRIPTION:Quantum metrology offers an enhanced performance in experiments such
as gravitational wave-detection, magnetometry and atomic clocks
frequency calibration. Under the idealistic assumption of no
decoherence, it allows for an improvement of measurement precision
over classical protocols that grows without restraint with the number
of particles involved. Motivated by practical applications, we propose
tools for quantifying the attainable quantum enhancement based on the
geometry of quantum channels and semi-definite programming that
account for the inevitable impact of the noise. As a result we obtain
a simple and direct methods yielding bounds that interpolate between
the quantum enhanced scaling characteristic for small number of
particles and the asymptotic regime, in which quantum enhancement
amounts to a constant factor improvement. Lastly, we are able to
propose a noise model that allows for the asymptotic constant to be
arbitrarily enlarged and the scaling enhancement to be retrieved. We
discuss its potential application in a quantum magnetometry setup.
LOCATION:Erwin-Schödinger-Saal, IQOQI
DTSTART:20140115T150000
DTEND:20140115T160000
TZID: Europe/Vienna
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