Experimental certification of contextuality, coherence, and dimension in a programmable universal photonic processor.

ABSTRACT: Quantum superposition of high-dimensional states enables both computational speed-up and security in cryptographic protocols. However, the exponential complexity of tomographic processes makes certification of these properties a challenging task. In this work, we experimentally certify coherence witnesses tailored for quantum systems of increasing dimension using pairwise overlap measurements enabled by a six-mode universal photonic processor fabricated with a femtosecond laser writing technology. In particular, we show the effectiveness of the proposed coherence and dimension witnesses for qudits of dimensions up to 5. We also demonstrate advantage in a quantum interrogation task and show it is fueled by quantum contextuality. Our experimental results testify to the efficiency of this app

SUBMITTER: Giordani T 

PROVIDER: S-EPMC10624346 | biostudies-literature | 2023 Nov

REPOSITORIES: biostudies-literature