15 citations · 81 across the 14 of their papers we have counts for
14 papers
Multiple fidelities and joint numerical range
Pei Li, Bang-Hai Wang
We investigate the effectiveness of entanglement detection based on multiple fidelities via the geometry of the joint separable numerical range. When all reference states are produ…
An RNN-policy gradient approach for quantum architecture search
Gang Wang, Bang-Hai Wang, Shao-Ming Fei
Variational quantum circuits are one of the promising ways to exploit the advantages of quantum computing in the noisy intermediate-scale quantum technology era. The design of the…
Common Coherence Witnesses and Common Coherent States
Bang-Hai Wang, Zi-Heng Ding, Zhihao Ma +1
We show the properties and characterization of coherence witnesses. We show methods for constructing coherence witnesses for an arbitrary coherent state. We investigate the problem…
Tomographic Witnessing and Holographic Quantifying of Coherence
Bang-Hai Wang, Si-Qi Zhou, Zhihao Ma +1
The detection and quantification of quantum coherence play significant roles in quantum information processing. We present an efficient way of tomographic witnessing for both theor…
Internal Boundary between Entanglement and Separability Within a Quantum State
Bang-Hai Wang
Quantum states are the key mathematical objects in quantum mechanics, and entanglement lies at the heart of the nascent fields of quantum information processing and computation. Ho…
Entangled states in the role of witnesses
Bang-Hai Wang
Quantum entanglement lies at the heart of quantum mechanics and quantum information processing. In this work, we show a new framework where entangled states play the role of witnes…
The hierarchies of "witnesses" and the properties and characterization of entangled states as super entanglement witnesses
Bang-Hai Wang
Quantum entanglement lies at the heart of quantum mechanical and quantum information processing. Following the question who \emph{witnesses} entanglement witnesses, we show entangl…
Universal Single-Server Blind Quantum Computation for Classical Clients
Hai-Ru Xu, Bang-Hai Wang
Blind quantum computation allows a client without enough quantum technologies to delegate her quantum computation to a remote quantum server, while keeping her input, output and al…
Characterization and properties of weakly optimal entanglement witnesses
Bang-Hai Wang, Hai-Ru Xu, Steve Campbell +1
We present an analysis of the properties and characteristics of weakly optimal entanglement witnesses, that is witnesses whose expectation value vanishes on at least one product ve…
Universal methods for extending any entanglement witness from the bipartite to the multipartite case
Bang-Hai Wang, Hai-Ru Xu, Simone Severini
Any bipartite entanglement witness can be written as , where is a quantum state, is the identity matrix, and is a non-negative number. We present a gene…
A sufficient condition of violating the SPA conjecture
Bang-Hai Wang, Dong-Yang Long
Based on the general form of entanglement witnesses constructed from separable states, we first show a sufficient condition of violating the structural physical approximation (SPA)…
Constructing all entanglement witnesses from density matrices
Bang-Hai Wang, Dong-Yang Long
We demonstrate a general procedure to construct entanglement witnesses for any entangled state. This procedure is based on the trace inequality and a general form of entanglement w…
Structural physical approximations and entanglement witnesses
Bang-Hai Wang, Dong-Yang Long
The structural physical approximation (SPA) to a positive map is considered to be one of the most important method to detect entanglement in the real physical world. We first show…
The Origin of Separable States and Separability Criteria from Entanglement-breaking Channels
Bang-Hai Wang, Qin Li, Dongyang Long
In this paper, we show that an arbitrary separable state can be the output of a certain entanglement-breaking channel corresponding exactly to the input of a maximally entangled st…