181 citations · 2.5k across the 63 of their papers we have counts for
63 papers
Information Theoretic Significance of Projective Measurements
Huangjun Zhu
Projective measurements in quantum theory have a very simple algebraic definition, but their information theoretic significance is quite elusive. Here we introduce a simple order r…
Robust and efficient verification of graph states in blind measurement-based quantum computation
Zihao Li, Huangjun Zhu, Masahito Hayashi
Blind quantum computation (BQC) is a secure quantum computation method that protects the privacy of clients. Measurement-based quantum computation (MBQC) is a promising approach fo…
Significance improvement by randomized test in random sampling without replacement
Zihao Li, Huangjun Zhu, Masahito Hayashi
This paper studies one-sided hypothesis testing under random sampling without replacement. That is, when binary random variables are subject to a permut…
Nearly tight universal bounds for the binomial tail probabilities
Huangjun Zhu, Zihao Li, Masahito Hayashi
We derive simple but nearly tight upper and lower bounds for the binomial lower tail probability (with straightforward generalization to the upper tail probability) that apply to t…
Efficient verification of Affleck-Kennedy-Lieb-Tasaki states
Tianyi Chen, Yunting Li, Huangjun Zhu
Affleck-Kennedy-Lieb-Tasaki (AKLT) states are an important class of many-body quantum states that are useful in quantum information processing, including measurement-based quantum…
Efficient Verification of Ground States of Frustration-Free Hamiltonians
Huangjun Zhu, Yunting Li, Tianyi Chen
Ground states of local Hamiltonians are of key interest in many-body physics and also in quantum information processing. Efficient verification of these states are crucial to many…
Minimum number of experimental settings required to verify bipartite pure states and unitaries
Yunting Li, Haoyu Zhang, Zihao Li +1
Efficient verification of quantum states and gates is crucial to the development of quantum technologies. Although the sample complexities of quantum state verification and quantum…
Optimal Verification of the Bell State and Greenberger-Horne-Zeilinger States in Untrusted Quantum Networks
Yun-Guang Han, Zihao Li, Yukun Wang +1
Bipartite and multipartite entangled states are basic ingredients for constructing quantum networks and their accurate verification is crucial to the functioning of the networks, e…
Quantum Measurements in the Light of Quantum State Estimation
Huangjun Zhu
Starting from a simple estimation problem, here we propose a general approach for decoding quantum measurements from the perspective of information extraction. By virtue of the est…
Efficient Experimental Verification of Quantum Gates with Local Operations
Rui-Qi Zhang, Zhibo Hou, Jun-Feng Tang +5
Verifying the correct functioning of quantum gates is a crucial step towards reliable quantum information processing, but it becomes an overwhelming challenge as the system size gr…
Experimental Masking of Real Quantum States
Rui-Qi Zhang, Zhibo Hou, Zihao Li +4
Masking of quantum information is a way of hiding information in correlations such that no information is accessible to any local observer. Although the set of all quantum states a…
Hiding and masking quantum information in complex and real quantum mechanics
Huangjun Zhu
Classical information can be completely hidden in the correlations of bipartite quantum systems. However, it is impossible to hide or mask all quantum information according to the…
Optimal verification of stabilizer states
Ninnat Dangniam, Yun-Guang Han, Huangjun Zhu
Statistical verification of a quantum state aims to certify whether a given unknown state is close to the target state with confidence. So far, sample-optimal verification protocol…
Verification of phased Dicke states
Zihao Li, Yun-Guang Han, Hao-Feng Sun +2
Dicke states are typical examples of quantum states with genuine multipartite entanglement. They are valuable resources in many quantum information processing tasks, including mult…
Zero Uncertainty States in the Presence of Quantum Memory
Huangjun Zhu
The uncertainty principle imposes a fundamental limit on predicting the measurement outcomes of incompatible observables even if complete classical information of the system state…
Experimental optimal orienteering via parallel and antiparallel spins
Jun-Feng Tang, Zhibo Hou, Jiangwei Shang +4
Antiparallel spins are superior in orienteering to parallel spins. This intriguing phenomenon is tied to entanglement associated with quantum measurements rather than quantum state…
Efficient verification of quantum gates with local operations
Huangjun Zhu, Haoyu Zhang
Efficient verification of the functioning of quantum devices is a key to the development of quantum technologies, but is a daunting task as the system size increases. Here we propo…
Optimal Verification of Greenberger-Horne-Zeilinger States
Zihao Li, Yun-Guang Han, Huangjun Zhu
We construct optimal protocols for verifying qubit and qudit GHZ states using local projective measurements. When the local dimension is a prime, an optimal protocol is constructed…
General framework for verifying pure quantum states in the adversarial scenario
Huangjun Zhu, Masahito Hayashi
Bipartite and multipartite entangled states are of central interest in quantum information processing and foundational studies. Efficient verification of these states, especially i…
Efficient Verification of Pure Quantum States in the Adversarial Scenario
Huangjun Zhu, Masahito Hayashi
Efficient verification of pure quantum states in the adversarial scenario is crucial to many applications in quantum information processing, such as blind measurement-based quantum…
Implementation of generalized measurements on a qudit via quantum walks
Zihao Li, Haoyu Zhang, Huangjun Zhu
Quantum measurements play a fundamental role in quantum mechanics and quantum information processing, but it is not easy to implement generalized measurements, the most powerful me…
Efficient verification of Dicke states
Ye-Chao Liu, Xiao-Dong Yu, Jiangwei Shang +2
Among various multipartite entangled states, Dicke states stand out because their entanglement is maximally persistent and robust under particle losses. Although much attention has…
Efficient verification of bipartite pure states
Zihao Li, Yun-Guang Han, Huangjun Zhu
We propose practical and efficient protocols for verifying bipartite pure states for any finite dimension, which can also be applied to fidelity estimation. Our protocols are based…
Optimal verification and fidelity estimation of maximally entangled states
Huangjun Zhu, Masahito Hayashi
We study the verification of maximally entangled states by virtue of the simplest measurement settings: local projective measurements without adaption. We show that optimal protoco…