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Tytuł artykułu

Coherently enhanced measurements in classical mechanics

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
In all quantitative sciences, it is common practice to increase the signal-to-noise ratio of noisy measurements by measuring identically prepared systems N times and averaging the measurement results. This leads to a scaling of the sensitivity as 1/√N, known in quantum measurement theory as the “standard quantum limit” (SQL). It is known that if one puts the N systems into an entangled state, a scaling as 1/N can be achieved, the socalled “Heisenberg limit” (HL), but decoherence problems have so far prevented implementation of such protocols for large N. Here we show that a method of coherent averaging inspired by a recent entanglement-free quantum enhanced measurement protocol is capable of achieving a sensitivity that scales as 1/N in a purely classical setup. This may substantially improve the measurement of very weak interactions in the classical realm, and, in particular, open a novel route to measuring the gravitational constant with enhanced precision.
Słowa kluczowe
Wydawca
Rocznik
Tom
2
Numer
1
Opis fizyczny
Daty
otrzymano
2014-04-16
poprawiono
2014-06-13
zaakceptowano
2014-07-03
online
2014-08-06
Twórcy
autor
  • Laboratoire de Physique Théorique, IRSAMC, UMR
    5152 du CNRS, and Université Paul Sabatier, Toulouse, France
    and Institut für Theoretische Physik, Universität Tübingen, Germany
  • H. H. Wills Physics Laboratory, University of Bristol,
    Tyndall Avenue, Bristol, BS8 1TL, United Kingdom
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Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_qmetro-2014-0003
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