2023-04-19 11:00:00 | America/New_York

Emmanuel Zambrini Cruzeiro Instituto de Telecomunicações and Instituto Superior Técnico

Entanglement-assisted communication

Entanglement is known to boost the efficiency of classical communication. In distributed computation, for instance, exploiting entanglement can reduce the number of communicated bits or increase the probability to obtain a correct answer. Entanglement-assisted classical communication protocols usually consist of two successive rounds: first a Bell test round, in which the parties measure their local shares of the entangled state, and then a communication round, where they exchange classical messages. Here, we go beyond this standard approach and investigate adaptive uses of entanglement: we allow the receiver to wait for the arrival of the sender’s message before measuring his share of the entangled state. We first show that such adaptive protocols improve the success probability in Random Access Codes. Second, we show that once adaptive measurements are used, an entanglement-assisted bit becomes a strictly stronger resource than a qubit in prepare-and-measure scenarios. We discuss the extension of these ideas to scenarios involving quantum communication and identify resource inequalities.

Speaker's Bio

Ph.D. "Spin dynamics in rare-earth ion-doped crystals for optical quantum memories", from the University of Geneva, under the supervision of Dr. Mikael Afzelius and Prof. Nicolas Gisin. Postdocs: quantum correlations (foundational, theory), e.g. Bell nonlocality, contextuality. I am an Assistant Professor in Instituto Superior Técnico, and have recently started a group in Instituto de Telecomunicações. We have a small lab called the Quantum Photonics Laboratory (QuLab), where we work on applications of quantum correlations to quantum communication, and free-space quantum communication.