Indefinite causal order

Abstract: In our daily life, we experience a fixed order of events. The notion of such a fixed causal order breaks down when we enter the quantum regime. In the quantum realm, it is possible to have situations where no definite causal structure can be attributed. Apart from the foundational aspect, such exotic causal structures are useful to achieve augmented communication.

In the first two parts of this talk, I will present our experimental realisation of an indefinitely causal ordered scenario and demonstrate how one can achieve a communication advantage out of it. In the last part, I will discuss how one can attribute several information-theoretic aspects to an arbitrary causal structure. In that part, I will define a notion of classical capacity for an indefinite causal order, and present several information-theoretic bounds obtained from our study.

quantum computing and information

Audience: researchers in the topic

Centre for Quantum Software and Information Seminar Series

Series comments: To request the zoom link, please send a message to: cqsiadmin@uts.edu.au using your business/organisation/institution email address. Watch previous seminars on YouTube: - QSI Seminar Series 2021 (https://youtube.com/playlist?list=PLux7B14QYkPbDDOpqKSWScHXHodiBwr48) - QSI Seminar Series 2020 (https://youtube.com/playlist?list=PLux7B14QYkPZREUXReOq01ewLl02QXBXa)