  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. The obtained samples are validated
against various hypotheses including using thermal states, distinguishable
photons, and uniform distribution.
