Zejun Huang

activity

20122023

most citedPhysical transformations between quantum states

20 citations · 42 across the 17 of their papers we have counts for

collaborators

18 papers

math.FA2023

Linear maps preserving (p,k) norms of tensor products of matrices

Zejun Huang, Nung-Sing Sze, Run Zheng

Let $m, n \geq 2$ be integers. Denote by $M_{n}$ the set of $n \times n$ complex matrices. Let $∥ \cdot ∥_{(p, k)}$ be the $(p, k)$ norm on $M_{mn}$ with $1 \leq k \leq mn$ and $2 < p < \infty$ .…

math.CO2022

Cliques and independent subgroups of the Birkhoff polytope graph

Zejun Huang, Chi-Kwong Li, Eric Swartz +1

The Birkhoff polytope $Ω_{n}$ is the polytope of doubly stochastic matrices of order $n$ . The Birkhoff polytope graph $G (Ω_{n})$ is the skeleton of $Ω_{n}$ ; it is the Cayley graph whose…

math.CO2021

The set of stable indices of 0-1 matrices with a given order

Zhibing Chen, Zejun Huang

The stable index of a 0-1 matrix $A$ is defined to be the smallest integer $k$ such that $A^{k + 1}$ is not a 0-1 matrix if such an integer exists; otherwise the stable index of $A$ …

math.CO2021

Extremal digraphs avoiding distinct walks of length 3 with the same endpoints

Zejun Huang, Zhenhua Lyu

In this paper, we determine the maximum size of digraphs on $n$ vertices in which there are no two distinct walks of length $3$ with the same initial vertex and the same terminal v…

math.CO2019

On $k$ -idempotent 0-1 matrices

Zejun Huang, Huiqiu Lin

Let $k \geq 2$ be an integer. If a square 0-1 matrix $A$ satisfies $A^{k} = A$ , then $A$ is said to be $k$ -idempotent. In this paper, we give a characterization of $k$ -idempotent 0-1 mat…

math.CO2019

The stable index of 0-1 matrices

Zhibing Chen, Zejun Huang, Jingru Yan

We introduce the concept of stable index for 0-1 matrices. Let $A$ be a 0-1 square matrix. If $A^{k}$ is a 0-1 matrix for every positive integer $k$ , then the stable index of $A$ is…