Quantum computational advantage using photons

Understand

Gaussian boson sampling exploits squeezed states to provide a highly efficient way to demonstrate quantum computational advantage.

• We perform experiments with 50 input single-mode squeezed states with high indistinguishability and squeezing parameters, which are fed into a 100-mode ultralow-loss interferometer with full connectivity and random transformation, and sampled using 100 high-efficiency single-photon detectors.
• The whole optical set-up is phase-locked to maintain a high coherence between the superposition of all photon number states.
• We observe up to 76 output photon-clicks, which yield an output state space dimension of $10^{30}$ and a sampling rate that is $10^{14}$ faster than using the state-of-the-art simulation strategy and supercomputers.