51 citations · 557 across the 38 of their papers we have counts for
39 papers
Self-testing ideal quantum measurements
Debashis Saha, Zhen-Peng Xu, Adán Cabello
A fundamental prediction of quantum mechanics is that observables can be measured through ideal measurements, that is, measurements that give the same outcome when repeated and do…
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…
FAS-aided Robust Anti-Jamming Communications: Continuous and Discrete Positioning Designs
Yifan Guo, Junshan Luo, Shilian Wang +1
This paper investigates the joint optimization of beamforming and antenna positions in fluid antenna system (FAS)-aided anti-jamming communications. We consider a multi-user multip…
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-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…
Characterizing arbitrary quantum networks in the noisy intermediate-scale quantum era
Zhen-Peng Xu
Quantum networks are of high interest nowadays. In short, they describe the distribution of quantum sources represented by edges to different parties represented by nodes in the ne…
Experimental test of high-dimensional quantum contextuality based on contextuality concentration
Zheng-Hao Liu, Hui-Xian Meng, Zhen-Peng Xu +6
Contextuality is a distinctive feature of quantum theory and a fundamental resource for quantum computation. However, existing examples of contextuality in high-dimensional systems…
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…
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…
Systematic construction of quantum contextuality scenarios with rank advantage
Pascal Höhn, Zhen-Peng Xu, Matthias Kleinmann
A set of quantum measurements exhibits quantum contextuality when any consistent value assignment to the measurement outcomes leads to a contradiction with quantum theory. In the o…
Fate of multiparticle entanglement when one particle becomes classical
Zhen-Peng Xu, Satoya Imai, Otfried Gühne
We study the change of multiparticle entanglement if one particle becomes classical, in the sense that this particle is destructed by a measurement, but the gained information is e…
Graph-theoretic approach to Bell experiments with low detection efficiency
Zhen-Peng Xu, Jonathan Steinberg, Jaskaran Singh +3
Bell inequality tests where the detection efficiency is below a certain threshold can be simulated with local hidden-variable models. Here, we introduce a method to…
Quantum contextuality provides communication complexity advantage
Shashank Gupta, Debashis Saha, Zhen-Peng Xu +2
Despite the conceptual importance of contextuality in quantum mechanics, there is a hitherto limited number of applications requiring contextuality but not entanglement. Here, we s…
No-go theorem based on incomplete information of Wigner about his friend
Zhen-Peng Xu, Jonathan Steinberg, H. Chau Nguyen +1
The notion of measurements is central for many debates in quantum mechanics. One critical point is whether a measurement can be regarded as an absolute event, giving the same resul…
Generalized Iterative Formula for Bell Inequalities
Xing-Yan Fan, Zhen-Peng Xu, Jia-Le Miao +7
Bell inequalities are a vital tool to detect the nonlocal correlations, but the construction of them for multipartite systems is still a complicated problem. In this work, inspired…
Symmetries in quantum networks lead to no-go theorems for entanglement distribution and to verification techniques
Kiara Hansenne, Zhen-Peng Xu, Tristan Kraft +1
Quantum networks are promising tools for the implementation of long-range quantum communication. The characterization of quantum correlations in networks and their usefulness for i…
Graph-Theoretic Framework for Self-Testing in Bell Scenarios
Kishor Bharti, Maharshi Ray, Zhen-Peng Xu +3
Quantum self-testing is the task of certifying quantum states and measurements using the output statistics solely, with minimal assumptions about the underlying quantum system. It…
Genuine Multipartite Entanglement in Time
Simon Milz, Cornelia Spee, Zhen-Peng Xu +3
While spatial quantum correlations have been studied in great detail, much less is known about the genuine quantum correlations that can be exhibited by temporal processes. Employi…
State-independent quantum contextuality with projectors of nonunit rank
Zhen-Peng Xu, Xiao-Dong Yu, Matthias Kleinmann
Virtually all of the analysis of quantum contextuality is restricted to the case where events are represented by rank-one projectors. This restriction is arbitrary and not motivate…
Structure of dimension-bounded temporal correlations
Yuanyuan Mao, Cornelia Spee, Zhen-Peng Xu +1
We analyze the structure of the space of temporal correlations generated by quantum systems. We show that the temporal correlation space under dimension constraints can be nonconve…
Proof of the Peres conjecture for contextuality
Zhen-Peng Xu, Jing-Ling Chen, Otfried Gühne
A central result in the foundations of quantum mechanics is the Kochen-Specker theorem. In short, it states that quantum mechanics cannot be reconciled with classical models that a…
General Hardy-Type Paradox Based on Bell inequality and its Experimental Test
Mu Yang, Hui-Xian Meng, Jie Zhou +7
Local realistic models cannot completely describe all predictions of quantum mechanics. This is known as Bell's theorem that can be revealed either by violations of Bell inequality…
Deriving Einstein-Podolsky-Rosen steering inequalities from the few-body Abner Shimony inequalities
Jie Zhou, Hui-Xian Meng, Shu-Han Jiang +4
For the Abner Shimony (AS) inequalities, the simplest unified forms of directions attaining the maximum quantum violation are investigated. Based on these directions, a family of E…
Necessary and sufficient condition for contextuality from incompatibility
Zhen-Peng Xu, Adán Cabello
Measurement incompatibility is the most basic resource that distinguishes quantum from classical physics. Contextuality is the critical resource behind the power of some models of…