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2013 | 1 | 12-20
Tytuł artykułu

Quantum estimation of a two-phase spin rotation

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
system, characterised by two unknown phases, and compare the estimation precision achievable with two different strategies. The first is a standard ‘joint estimation’ strategy, in which a single probe state is used to estimate both parameters, while the second is a ‘sequential’ strategy in which the two phases are estimated separately, each on half of the total number of system copies. In the limit of small angles we show that, although the joint estimation approach yields in general a better performance, the two strategies possess the same scaling of the total phase sensitivity with respect to the spin number j, namely ΔΦ≃ 1/j. Finally, we discuss a simple estimation strategy based on spin squeezed states and spin measurements, and compare its performance with the ultimate limits to the estimation precision that we have derived above.
Wydawca

Rocznik
Tom
1
Strony
12-20
Opis fizyczny
Daty
otrzymano
2012-11-30
zaakceptowano
2013-05-10
online
2013-06-25
Twórcy
autor
  • École Normale Supérieure de Lyon,
    15 parvis Descartes, BP 7000,
    69342 Lyon Cedex 07, France
  • QOLS, Blackett Laboratory, Imperial College London,
    London SW7 2BW, UK
  • QOLS, Blackett Laboratory, Imperial College London,
    London SW7 2BW, UK
Bibliografia
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Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_qmetro-2013-0003
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