[Qp-l] Seminar next Thursday 16:30 CET: Géza Tóth

[Gilyén András]

Hi.

The next seminar will be given by Géza Tóth (University of the Basque
Country).

The title of the talk is "Quantum metrology from a quantum information
science perspective", and the abstract can be found at the bottom of the
e-mail.

Based on the success of the after-seminar gathering we will once again use
gather.town to continue discussions after the seminar and the "plenary
questions" ended. I will send the link one day before the seminar.

Best wishes,

András

*Abstract:* We discuss how quantum systems can be used for parameter
estimation. We present the central notions of the field such as the quantum
Fisher information and the Cramér-Rao bound. We review basic findings on
how the precision of the parameter estimation scales with the number of
particles in a linear interferometer. The best scaling achievable is
quadratic, however, quantum entanglement is needed to surpass the linear or
shot-noise scaling. Finally, we explain how uncorrelated noise limits the
highest achievable precision in practice. We present the theory of quantum
metrology based on concrete setups using highly entangled quantum states,
such as Greenberger-Horne-Zeilinger states, spin squeezed states, Dicke
states and singlet states.

The talk is based on: G. Tóth and I. Apellaniz, Quantum metrology from a
quantum information science perspective, J. Phys. A: Math. Theor. 47,
424006 (2014), special issue "50 years of Bell's theorem";
http://optics.szfki.kfki.hu/~toth/Publications/JPHYSA14.pdf
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