Speaker: 程书明研究员，同济大学

Inviter: 李楠副研究员

Title: Direct observation of general Kirkwood-Dirac quasiprobability distributions

Language: Chinese

Time & Venue: 2024.10.24 11:00-12:00 思源楼 625

Abstract: The Kirkwood-Dirac (KD) quasiprobability distribution has generated great interest as prominent indicators of non-classical features in quantum information processing. However, the current study is mainly focused on the KD generated by von Neumann measurement, thus limiting its practical utility in predicting realistic experimental data. We investigate the KD with general measurements and obtain some insightful upper bounds for KD distributions. Importantly, a deterministic protocol is presented to directly observe any KD distribution, as well as measurement noncommutativity and incompatibility. It is then exemplified as an easy implementable device that can flexibly characterise quantum computing systems by consuming much less measurement resources. Generalisations of our results to an arbitrary number of measurements are also given. Our work opens a new avenue to study the general KD distribution and its practical applications in quantum processing tasks.