Quantum-enhanced communication and sensing in quantum network: theory and experiment.

Wednesday, July 19, 2023 10:00 am - 11:00 am EDT (GMT -04:00)

IQC Seminar - Yujie Zhang, University of Illinois at Urbana-Champaign

A global quantum network stands at the frontier of the ongoing technological revolution and has led to both theoretical discussion on designing new network quantum protocols, and experimental works in their implementation.  In this talk, we will explore applications of the quantum network with novel theoretical proposals and their table-top experimental demonstrations including quantum enhanced multiple-access communications and astronomical sensing with quantum telescopy.

In multiple-access communication, we will firstly show how single quantum particle could help in building a multiple-access channel that is not achievable with any classical resource [1] by characterizing the sets of all classical multiple-access channel, identifying classical boundaries as inequalities, and providing violation with quantum strategy.  Besides that, discussion on how to use quantum multiple-access channel to achieve higher communication rate will be presented both theoretically and experimentally [2].

In quantum telescopy, we will discuss our experimental proposal [3] in implementing the original quantum telescopy proposed by Gottesman, Jennewein and Croke. Besides that, a comprehensive discussion on different classical and quantum-enhanced interferometric imaging scheme will be given, quantified and compared by their performance (as Fisher information) in estimating the mutual coherent function [4], where a novel scheme based on continuous variable quantum teleportation will be given[5].

In the end, few other works that are related to quantum network will be briefly mentioned, including discussion on non-locality breaking quantum channel and its activation [6] and interferometric super-resolution of two-point source [7]

[1] Y.Zhang, X.Chen, E.Chitambar, Quantum 6, 653 (2022)

[2] X.Chen*, Y.Zhang* A. White, V. Lorenz, E.Chitamber , et.al., arXiv:2301.02513 (2023)

[3] D.Dais, Y. Zhang, Y.Wang, V.Lorenz, P.Kwiat,  et.al, FIO (pp. FM5B-2).  (2022)

[4] Y.Zhang, Y.Wang, and V. O. Lorenz, in preparation

[5] Y.Wang, Y.Zhang, and V. O. Lorenz, in preparation

[6] Y.Zhang*, R.A Bravo*,, V. Lorenz, E.Chitamber New J. Phys. 22 043003 (2020)

[7] Y.Wang, Y.Zhang, and V. O. Lorenz, PRA, 104(2), 022613. (2021)