Experimental entanglement quantification and verification via uncertainty relations

Key Laboratory of Quantum Information, University of Science and Technology of China, CAS - Hefei 230026, PRC

Corresponding authors: sdzzwzw@mail.ustc.edu.cn hyf@ustc.edu.cn

Received: 11 January 2007
Accepted: 3 April 2007

Abstract

We report on experimental studies on entanglement quantification and verification based on uncertainty relations for systems consisting of two qubits. The new proposed measure is shown to be invariant under local unitary transformations, by which entanglement quantification is implemented for two-qubit pure states. The nonlocal uncertainty relations for two-qubit pure states are also used for entanglement verification which serves as a basic proposition and promise to be a good choice for verification of multipartite entanglement.