ABSTRACT
Entanglement, or the existence of nonclassical correlations between
distinct, potentially distant quantum objects, is one of the most
intriguing aspects of quantum mechanics. The first discussed, and
probably most famous, phenomenon arising from entanglement is
the EPR paradox, published in 1935 by Albert Einstein et al. [361]. While the early discussions of this paradox remained on the
philosophical level of Gedankenexperiments, it took about 30
years until it was put into a verifiable mathematical form in
1964, today known as the Bell inequality [362]. This and related formulations [363] have been experimentally tested many times
since the early 1980s [364, 365]. None of these tests gave clear
evidence for the incorrectness or incompleteness of quantum
mechanics.