PIRSA:22060043

Geometry of Process Matrices

Ni Chuireain, F. (2022). Geometry of Process Matrices. Perimeter Institute. https://pirsa.org/22060043

Ni Chuireain, Fionnuala. Geometry of Process Matrices. Perimeter Institute, Jun. 20, 2022, https://pirsa.org/22060043 

          @misc{ pirsa_PIRSA:22060043,
            doi = {10.48660/22060043},
            url = {https://pirsa.org/22060043},
            author = {Ni Chuireain, Fionnuala},
            keywords = {Other},
            language = {en},
            title = {Geometry of Process Matrices},
            publisher = {Perimeter Institute},
            year = {2022},
            month = {jun},
            note = {PIRSA:22060043 see, \url{https://pirsa.org}}
          }

Fionnuala Ni Chuireain Institute of Photonic Sciences (ICFO)

Talk number PIRSA:22060043
DOI 10.48660/22060043
Collection
Talk Type Conference
Subject

Abstract

Process matrices are objects that comprehensively describe multipartite quantum processes and their correlations. These matrices simultaneously play the roles of quantum states and quantum channels, and, to ensure a well-defined probability distribution, they are constrained to be positive. A key advantage of the process matrix formalism is that it can be used to describe processes with an indefinite causal order, which obey local quantum mechanics but cannot take place within a global causal structure. In this talk, i will give a complete introduction to the process matrix formalism and share preliminary results about the geometric positivity constraints of a special class of parameterised process matrices.