84 citations · 379 across the 37 of their papers we have counts for
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Linear maps preserving numerical radius of tensor product of matrices
Ajda Fošner, Zejun Huang, Chi-Kwong Li +1
We determine the structure of linear maps on the tensor product of matrices which preserve the numerical range or numerical radius.
Linear maps preserving Ky Fan norms and Schatten norms of tensor products of matrices
Ajda Fosner, Zejun Huang, Chi-Kwong Li +1
For a positive integer , let be the set of complex matrices. Suppose is the Ky Fan -norm with or the Schatten -norm with $1…
Criteria and new classes of k-positive maps
Jinchuan Hou, Chi-Kwong Li, Yiu-Tung Poon +2
We study k-positive maps on operators. Proofs are given to different positivity criteria. Special attention is on positive maps arising in the study of quantum information science.…
Linear preservers and quantum information science
Ajda Fosner, Zejun Huang, Chi-Kwong Li +1
Let be positive integers, the set of complex matrices and the set of complex matrices. Regard as the tensor space $M_m\otime…
Entanglement transformation between sets of bipartite pure quantum states using local operations
H. F. Chau, Chi-Hang Fred Fung, Chi-Kwong Li +2
Alice and Bob are given an unknown initial state chosen from a set of pure quantum states. Their task is to transform the initial state to a corresponding final pure state using lo…
Physical transformations between quantum states
Zejun Huang, Chi-Kwong Li, Edward Poon +1
Given two sets of quantum states {A_1, ..., A_k} and {B_1, ..., B_k}, represented as sets of density matrices, necessary and sufficient conditions are obtained for the existence of…