175 citations · 1.6k across the 65 of their papers we have counts for
9 papers · 2 filters
Compression of Quantum Multi-Prover Interactive Proofs
Zhengfeng Ji
We present a protocol that transforms any quantum multi-prover interactive proof into a nonlocal game in which questions consist of logarithmic number of bits and answers of consta…
Joint product numerical range and geometry of reduced density matrices
Jianxin Chen, Cheng Guo, Zhengfeng Ji +4
The reduced density matrices of a many-body quantum system form a convex set, whose three-dimensional projection is convex in . The boundary of ma…
Physical origins of ruled surfaces on the reduced density matrices geometry
Ji-Yao Chen, Zhengfeng Ji, Zheng-Xin Liu +4
The reduced density matrices (RDMs) of many-body quantum states form a convex set. The boundary of low dimensional projections of this convex set may exhibit nontrivial geometry su…
Quantum State and Process Tomography via Adaptive Measurements
Hengyan Wang, Wenqiang Zheng, Nengkun Yu +9
We investigate quantum state tomography (QST) for pure states and quantum process tomography (QPT) for unitary channels via measurements. For a quantum system with a …
Dichotomy of entanglement depth for symmetric states
Ji-Yao Chen, Zhengfeng Ji, Nengkun Yu +1
Entanglement depth characterizes the minimal number of particles in a system that are mutually entangled. For symmetric states, we show that there is a dichotomy for entanglement d…
Zero-knowledge proof systems for QMA
Anne Broadbent, Zhengfeng Ji, Fang Song +1
Prior work has established that all problems in NP admit classical zero-knowledge proof systems, and under reasonable hardness assumptions for quantum computations, these proof sys…
Quantum state tomography via reduced density matrices
Tao Xin, Dawei Lu, Joel Klassen +7
Quantum state tomography via local measurements is an efficient tool for characterizing quantum states. However it requires that the original global state be uniquely determined (U…
Quantum Capacities for Entanglement Networks
Shawn X Cui, Zhengfeng Ji, Nengkun Yu +1
We discuss quantum capacities for two types of entanglement networks: for the quantum repeater network with free classical communication, and for the te…
Pure State Tomography with Pauli Measurements
Xian Ma, Tyler Jackson, Hui Zhou +10
We examine the problem of finding the minimum number of Pauli measurements needed to uniquely determine an arbitrary -qubit pure state among all quantum states. We show that onl…