5 papers · 1 filter
Optimal strategies for shadow tomography with limited resources
Zhen-Peng Xu, Qi Ye, Jie Wang +3
Shadow tomography addresses the task of efficiently predicting many expectation values of an unknown quantum state from randomized measurements on comparatively few copies. Existin…
Exploring the boundary of quantum correlations with a time-domain optical processor
Zheng-Hao Liu, Yu Meng, Yu-Ze Wu +10
Contextuality is a hallmark feature of the quantum theory that captures its incompatibility with any noncontextual hidden-variable model. The Greenberger--Horne--Zeilinger (GHZ)-ty…
Quantum-enhanced metrology with network states
Yuxiang Yang, Benjamin Yadin, Zhen-Peng Xu
Armed with quantum correlations, quantum sensors in a network have shown the potential to outclass their classical counterparts in distributed sensing tasks such as clock synchroni…
Bounding the joint numerical range of Pauli strings by graph parameters
Zhen-Peng Xu, René Schwonnek, Andreas Winter
The interplay between the quantum state space and a specific set of measurements can be effectively captured by examining the set of jointly attainable expectation values. This set…
Quantum LOSR networks cannot generate graph states with high fidelity
Yi-Xuan Wang, Zhen-Peng Xu, Otfried Gühne
Quantum networks lead to novel notions of locality and correlations and an important problem concerns the question of which quantum states can be experimentally prepared with a giv…