Robust Self Testing of Unknown Quantum Systems into Any Entangled Two-Qubit States

Self testing is a device independent approach to estimate the state and measurement operators, without the need to assume the dimension of our quantum system. In this paper, we show that one can self test black boxes into any pure entangled two-qubit state, by performing simple Bell type experiments. The approach makes use of only one family of two-inputs/two-outputs Bell inequalities. Furthermore, we outline the sufficient conditions for one to self test any dimensional bipartite entangled state. All these methods are robust to small but inevitable experimental errors.Comment: 14 pages, 3 figure

Device Independent Playground: Investigating and Opening up a Quantum Black Box

Ph.DDOCTOR OF PHILOSOPH

Information Causality and Extremal Tripartite Correlations

We study the principle of information causality for the set of extremal correlations in the tripartite scenario. We show that all but one nonlocal extremal correlations in this scenario violate information causality. This undetected correlation is shown to satisfy any bipartite physical principle.Comment: 8 pages, 2 figures. Minor corrections and improvement to the proof in appendi

Quantum Bell inequalities from macroscopic locality

10.1103/PhysRevA.83.022105Physical Review A - Atomic, Molecular, and Optical Physics832-PLRA