64 citations · 64 across the 5 of their papers we have counts for
5 papers
A Lie-algebraic Criterion for the Universality of Exponentiated Quantum Gates
Yinuo Xue, Qian Chen, Jing-Song Huang
We present a criterion that serves as the basis for a polynomial-time algorithm to decide whether a finite set of qudit gates exponentiated by some Hamiltonians is universal. Our a…
The complexity of semidefinite programs for testing -block-positivity
Qian Chen, Benoît Collins
We extend \cite{chen2025srkbp} by analyzing the complexity of the -block-positivity testing algorithm that stems from the optimization problem in Definition \ref{definition:SDP-…
Symmetry reduction for testing -block-positivity via extendibility
Qian Chen, Benoît Collins, Omar Fawzi
We study the problem of testing -block-positivity via symmetric -extendibility by taking the tensor product with a -dimensional maximally entangled state. We exploit the u…
Fields of definition for triangle groups as Fuchsian groups
Frank Calegari, Qiankang Chen
The compact hyperbolic triangle group admits a canonical representation to with discrete image which is unique up to conjugation. The trace…
Entanglement entropy of coherent intertwiner in loop quantum gravity
Gaoping Long, Qian Chen, Jinsong Yang
In this paper, we carry out the entanglement calculations on the coherent intertwiners. We first consider the entanglement introduced by the group-averaging of the tensor-product t…