Quantum Channel State Masking2021
Konferenz / Medium
Christian Deppe Holger Boche Uzi Pereg
Research Hub A: Kryptographie der Zukunft
Research Hub B: Eingebettete Sicherheit
RC 2: Quantum-Resistant Cryptography
RC 5: Physical-Layer Security
Communication over a quantum channel that depends on a quantum state is considered when the encoder has channel side information (CSI) and is required to mask information on the quantum channel state from the decoder. A full characterization is established for the entanglement-assisted masking equivocation region with a maximally correlated channel state, and a regularized formula is given for the quantum capacity-leakage function without assistance. For Hadamard channels without assistance, we derive single-letter inner and outer bounds, which coincide in the standard case of a channel that does not depend on a state.