(Phys.org)—As might be expected,the terms "monogamous" and "faithful" mean something a small different in the quantum world than they effect in everyday language. In a modern paper, a collaboration of physicists and mathematicians have shown that, and when quantified by a 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, or may also help to better understand the long-standing "firewall debate" related to the behavior of black holes.
Source: phys.org