  Quantum key distribution (QKD) provides information theoretically secures key
exchange requiring authentication of the classic data processing channel via
pre-sharing of symmetric private keys. In previous studies, the lattice-based
post-quantum digital signature algorithm Aigis-Sig, combined with public-key
infrastructure (PKI) was used to achieve high-efficiency quantum security
authentication of QKD, and its advantages in simplifying the MAN network
structure and new user entry were demonstrated. This experiment further
integrates the PQC algorithm into the commercial QKD system, the Jinan field
metropolitan QKD network comprised of 14 user nodes and 5 optical switching
nodes. The feasibility, effectiveness and stability of the post-quantum
cryptography (PQC) algorithm and advantages of replacing trusted relays with
optical switching brought by PQC authentication large-scale metropolitan area
QKD network were verified. QKD with PQC authentication has potential in
quantum-secure communications, specifically in metropolitan QKD networks.
