security of quantum cryptographic schemes tagged posts

Some measurements of entanglement violate monogamy, yet are geometrically faithful; others are monogamous but not faithful. Credit: Lancien et al. ©2016 American Physical Society

As expected, “monogamous” and “faithful” mean something a little different in the quantum world than they do in everyday language. When quantified by standard means, entanglement cannot be both monogamous and faithful at the same time. The results may be relevant when assessing the security of quantum cryptographic schemes, which rely on the monogamy of entanglement, and may also help to better understand the long-standing “firewall debate” related to the behavior of black holes.

Monogamy is considered to be a defining property of entanglement. Eg...