Appendix A Classical simulation task

It should be needed to sample one million samples, achieving the required XEB. Figure 1 shows a corresponding circuit example. The sampling process using the quantum circuit is computed as follows, 1. Quantum circuits: There have been many quantum circuits proposed as follows, Sycamore quantum [3]: It consists of 53 qubits and 20 cycles. For the Boson sampling problem, it only needs 200 seconds to finish this task, while it needs 10, 000 years for classical simulation. For the Gaussian Boson Sampling problem, it can use 200 s to finish up to a million times compared with classical simulations.