175 citations · 1.2k across the 63 of their papers we have counts for
7 papers · 1 filter
Tomography is necessary for universal entanglement detection with single-copy observables
Dawei Lu, Tao Xin, Nengkun Yu +7
Entanglement, one of the central mysteries of quantum mechanics, plays an essential role in numerous applications of quantum information theory. A natural question of both theoreti…
Detecting Consistency of Overlapping Quantum Marginals by Separability
Jianxin Chen, Zhengfeng Ji, Nengkun Yu +1
The quantum marginal problem asks whether a set of given density matrices are consistent, i.e., whether they can be the reduced density matrices of a global quantum state. Not many…
Maximum privacy without coherence, zero-error
Debbie Leung, Nengkun Yu
We study the possible difference between the quantum and the private capacities of a quantum channel in the zero-error setting. For a family of channels introduced by arXiv:1312.49…
Sample-optimal tomography of quantum states
Jeongwan Haah, Aram W. Harrow, Zhengfeng Ji +2
It is a fundamental problem to decide how many copies of an unknown mixed quantum state are necessary and sufficient to determine the state. Previously, it was known only that esti…
Generalized Graph States Based on Hadamard Matrices
Shawn X Cui, Nengkun Yu, Bei Zeng
Graph states are widely used in quantum information theory, including entanglement theory, quantum error correction, and one-way quantum computing. Graph states have a nice structu…
Experimental realisation of generalised qubit measurements based on quantum walks
Yuan-yuan Zhao, Neng-kun Yu, Pawe Kurzynski +3
We report an experimental implementation of a single-qubit generalised measurement scenario(POVM) based on a quantum walk model. The qubit is encoded in a single-photon polarisatio…