Abstract: Based on quantum information processing, a zero watermarking algorithm for quantum audio is proposed. Firstly, a set of quantum sequences are extracted in the low frequency region of the host quantum audio frequency domain by quantum discrete cosine transform, and then the sequence is encrypted by Henon mapping to generate quantum zero watermark. By using the quantum circuit of Henon mapping as the quantum secret key of zero watermark, the security of quantum zero watermark algorithm is effectively improved. This paper designs the circuit diagram of quantum Henon map scrambling and quantum zero watermark generation and extraction algorithm, and verifies the feasibility of the zero watermark algorithm. Simulation results show that compared with the existing quantum audio watermarking algorithms, the quantum zero watermarking algorithm proposed in this paper has better imperceptibility and robustness.