Local detection of entanglement
Departamento de Raios Cósmicos e Cronologia, Instituto de
Física Gleb Wataghin, Universidade Estadual de Campinas, C.P.
6165, cep 13084-971, Campinas, São Paulo, Brazil
Revised: 28 June 2005
Published online: 16 November 2005
We construct an explicit model where it can be established if a two mode pure Gaussian system is entangled or not by acting only on one of the parts that constitute the system. Measuring the dispersion in momentum and the time evolution of the dispersion in position of one particle we can tell if entanglement is present as well as the degree of entanglement of the system.
PACS: 03.67.-a – Quantum information / 03.65.Ud – Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.)
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2005