State-independent Uncertainty Relations and Entanglement Detection in Noisy Systems

verfasst von

René Schwonnek, Lars Dammeier, Reinhard F. Werner

Abstract

Quantifying quantum mechanical uncertainty is vital for the increasing number of experiments that reach the uncertainty limited regime. We present a method for computing tight variance uncertainty relations, i.e., the optimal state-independent lower bound for the sum of the variances for any set of two or more measurements. The bounds come with a guaranteed error estimate, so results of preassigned accuracy can be obtained straightforwardly. Our method also works for postive-operator-valued measurements. Therefore, it can be used for detecting entanglement in noisy environments, even in cases where conventional spin squeezing criteria fail because of detector noise.

Organisationseinheit(en)

Institut für Theoretische Physik
Abt. Nanostrukturen
SFB 1227: Designte Quantenzustände der Materie (DQ-mat)

Typ

Artikel

Journal

Phys. Rev. Lett.

Band

119

Anzahl der Seiten

1

Publikationsdatum

27.10.2017

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Allgemeine Physik und Astronomie

Elektronische Version(en)

https://doi.org/10.1103/PhysRevLett.119.170404 (Zugang: Unbekannt)