DQC Theory Seminars

Abstract: Negativity is an important bipartite entanglement measure, which we show to be necessary and sufficient for a broad class of physical mixed states, including disjoint regions of the many-body vacuum. Guided by the structure of the negativity contributing subspace, we define an entanglement class to which the reduced state of the disjoint regions belongs, enabling the calculation of optimal interaction profiles for extracting entanglement between disjoint regions. When measurements and classical communication with the remaining volume are allowed, entanglement between disjoint vacuum regions can be purified. We establish a protocol for quantitatively determining the projective measurements and the resulting purified entanglement between disjoint regions, finding that the minimum and maximum achievable pure entanglement decay exponentially faster and slower than the classical correlations present in the vacuum. The DQC Theory Seminars meet every other Wednesday from 2:00-3:00 p.m. in Gross Hall 324, beginning September 2. Tea and cookies are available from 1:45 p.m. Talks are primarily given by students and postdocs and may feature their own research, an interesting recent paper, or an open question they would like to discuss. Preliminary and unfinished ideas are especially welcome, with ample time for questions and discussion. Interested in giving a talk? Please fill out this form: https://docs.google.com/forms/d/e/1FAIpQLSepsyHr9PvA0EhlSA0AIwHSFRVC_l_HLZn9IVgasKA-_AP2gA/viewform