HyunHo Cha

Distributed quantum certification with Clifford encoders

Quantum state certification concerns a resource-efficient way to verify whether a quantum device produces a prescribed target state without reconstructing the state in full, making it a fundamental primitive for validating quantum systems. We consider the private-coin model with...

Random exclusion codes as vector random walks

Random exclusion codes (RECs) are one-shot communication tasks in which Alice receives a uniformly random word and sends a limited physical system to Bob, who is asked to output a symbol different from the one appearing at a randomly selected coordinate. We resolve the conjecture...

Random exclusion codes as vector random walks

Random exclusion codes (RECs) are one-shot communication tasks in which Alice receives a uniformly random word and sends a limited physical system to Bob, who is asked to output a symbol different from the one appearing at a randomly selected coordinate. We resolve the conjecture...