Deterministic Multi-User Identification over Bosonic Channels
Provides a theoretical foundation for multi-user identification in quantum communication, relevant for quantum information theory and secure communications.
The paper studies deterministic multi-user identification over bosonic channels using coherent-state signatures, showing that the identification capacity scales as near-k log k under average energy constraints.
We study deterministic multi-user identification over bosonic channels using coherent-state signatures. Each user is assigned a coherent product state under an average energy constraint, and identification is performed by a user-specific binary quantum test. In contrast to classical multi-user identification models based on shared codebooks, this formulation associates each receiver with a geometric signature in high-dimensional phase space. Using metric entropy bounds, we show that the identification capacity exhibits a near-k log k scaling behavior.