Qi Zhao

activity

20232026

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quant-ph2023

Bounds on $k$ -Uniform Quantum States

Fei Shi, Yu Ning, Qi Zhao +1

Do $N$ -partite $k$ -uniform states always exist when $k \leq ⌊ \frac{N}{2} ⌋ - 1$ ? In this work, we provide new upper bounds on the parameter $k$ for the existence of $k$ -uni…

quant-ph2023

Unextendible product bases from orthogonality graphs

Fei Shi, Ge Bai, Xiande Zhang +2

Unextendible product bases (UPBs) play a key role in the study of quantum entanglement and nonlocality. A famous open question is whether there exist genuinely unextendible product…

Bounds on k-Uniform Quantum States

Unextendible product bases from orthogonality graphs

Bounds on $k$ -Uniform Quantum States