This CCIS 2733 project constitutes the refereed post-conference proceedings of the 4th CCF Quantum Computation Conference, CQCC 2025, Chengdu, China, during July 21-23, 2025.

The 11 revised full papers presented in these proceedings were carefully reviewed and selected from 50 submissions. The papers are organized in the following topical sections:

Quantum Computing, Quantum Machine Learning, Quantum Simulation, Quantum Walks, Variational Quantum Algorithms, Quantum Circuit Optimization, Quantum Security, Quantum Cryptanalysis, Quantum Metrology, Hybrid Quantum-Classical Systems