New framework for Matrix Product Quantum Channels (MPQCs) proves all locally purified 1D channels form a single equivalence class, and that long-range entangled channels can be implemented in constant depth using two rounds of measurements and feedforward.
#QuantumChannels #TensorNetworks #Research
Researchers disprove the strong spin alignment conjecture with an explicit 3-qubit counterexample, showing majorization fails without global state compatibility. A refined compatible-marginal conjecture is proposed and partially proven.
#QuantumInformation #QuantumChannels #Research
New proofs establish additivity of channel Rényi information (α∈[½,1)) via multiplicative completely bounded quasi-norms, and additivity of channel dispersion—advancing quantum channel capacity theory and second-order asymptotic analysis.
#QuantumInformation #QuantumChannels #Research
