[Qp-l] [QCSBP] Seminar today at 16:30 CET: Géza Tóth

[Gilyén András]

Hi,

This is a friendly reminder that Géza Tóth will speak this afternoon about
"Quantum metrology from a quantum information science perspective".

You can join using the following Zoom link:
https://berkeley.zoom.us/j/96826613566?pwd=MUZtOGllSklFM2d0NGhwaFBqNXhjdz09
(due to the default privacy settings you need to sign into your Zoom
account before joining).

After the seminar we will have room for informal discussions as well on
gather.town: https://gather.town/i/q9fj6avP

Best,

András

Gilyén András <gilyenandras at gmail.com> ezt írta (időpont: 2021. febr. 18.,
Cs, 21:59):

> 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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