3 papers
quant-ph2025
Effective criteria for entanglement witnesses in small dimensions
Łukasz Grzelka, Łukasz Skowronek, Karol Życzkowski
We present an effective set of necessary and sufficient criteria for block-positivity of matrices of order over . The approach is based on Sturm sequences and quart…
quant-ph2025
Quantum Circuits for High-Dimensional Absolutely Maximally Entangled States
Berta Casas, Grzegorz Rajchel-Mieldzioć, Suhail Ahmad Rather +4
Absolutely maximally entangled (AME) states of multipartite quantum systems exhibit maximal entanglement across all possible bipartitions. These states lead to teleportation protoc…
quant-ph2024
Two-Unitary Complex Hadamard Matrices of Order
Wojciech Bruzda, Karol Życzkowski
A family of two-unitary complex Hadamard matrices (CHM) stemming from a particular matrix, of size is constructed. Every matrix in this orbit remains unitary after operations…