175 citations · 1.2k across the 63 of their papers we have counts for
7 papers · 2 filters
Exponential Separation of Quantum Communication and Classical Information
Anurag Anshu, Dave Touchette, Penghui Yao +1
We exhibit a Boolean function for which the quantum communication complexity is exponentially larger than the classical information complexity. An exponential separation in the oth…
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…
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…