Entanglement, Bell Inequalities and Quantum Information

William J. Munro, Kae Nemoto, Andrew G. White

Entanglement is a critical resource used in many current quantum information schemes. As such entanglement has been extensively studied in two qubit systems and its entanglement nature has been exhibited by violations of the Bell inequality. Can the amount of violation of the Bell inequality be used to quantify the degree of entanglement? What do Bell inequalities indicate about the nature of entanglement?

A. Mann, M. Revzen, Emilio Santos

Joonwoo BAE

The Royal Swedish Academy of Sciences awarded the Nobel Prize in Physics 2022 jointly to Alain Aspect, John Clauser, and Anton Zeilinger for experiments with entangled photons, establishing the violation of Bell inequalities and pioneering quantum information science. The present article provides a brief overview on the significance of their contributions and practical quantum information applications of Bell inequalities and entanglement.

Marian Kupczyński

Zhi Liu

The establishment of Bell's inequality and the ralation to the basic interpretation of quantum mechanics are discussed.The state of experimental test of Bell's inequality is introduced in detail since 1970s.The discovery of entangled states and rise of research on quantum information are narrated too.