Work

Measurement-Device-Independent Entanglement Witnesses for All Entangled Quantum States

Year: 2013

Type: article

Abstract: The problem of demonstrating entanglement is central to quantum information processing applications. Resorting to standard entanglement witnesses requires one to perfectly trust the implementation of the measurements to be performed on the entangled state, which may be an unjustified assumption. Inspired by the recent work of F. Buscemi [Phys. Rev. Lett. 108, 200401 (2012)], we introduce the concept of measurement-device-independent entanglement witnesses (MDI-EWs), which allow one to demonstrate entanglement of all entangled quantum states with untrusted measurement apparatuses. We show how to systematically obtain such MDI-EWs from standard entanglement witnesses. Our construction leads to MDI-EWs that are loss tolerant and can be implemented with current technology.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.110.060405

Authors: Cyril Branciard, Denis Rosset, Yeong-Cherng Liang, Nicolas Gisin

Institutions: The University of Queensland, University of Geneva

Language: English

Topic: Quantum Information and Cryptography

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: bronze

Funders: Agence Nationale de la Recherche, CHIST-ERA

Award: G125160087