# call for papers

Calls for Papers - Author Services » See which Taylor & Francis journals are currently promoting submissions. Journals with call for papers are often running special themes or topics. Authorservices.taylorandfrancis.com

USENIX WOOT 2016 Call for Papers » Call for Papers Sponsored by USENIX, the Advanced Computing Systems Association WOOT '16 will be co-located with the 25th USENIX Security Symposium (USENIX Security '16) and take place August 8–9, 2016. Important Dates Submissions due: Tuesday, May 17, 2016, 8:59 p. Linkedin.com

Witnessing quantum discord in 2 x N systems » Bipartite states with vanishing quantum discord are necessarily separable and hence positive partial transpose (PPT). We show that 2 x N states satisfy additional property: the positivity of their partial transposition is recognized with respect to the canonical factorization of the original density operator. We call such states SPPT (for strong PPT). Therefore, we provide a natural witness for a quantum discord: if a 2 x N state is not SPPT it must contain nonclassical correlations measured by quantum discord. It is an analog of the celebrated Peres-Horodecki criterion: if a state is not PPT it must be entangled. Arxiv.org