Quantum computational advantage using photons

• URL: http://arxiv.org/abs/2012.01625v1
• Date: Thu, 3 Dec 2020 01:16:30 GMT
• Title: Quantum computational advantage using photons
• Authors: Han-Sen Zhong, Hui Wang, Yu-Hao Deng, Ming-Cheng Chen, Li-Chao Peng, Yi-Han Luo, Jian Qin, Dian Wu, Xing Ding, Yi Hu, Peng Hu, Xiao-Yan Yang, Wei-Jun Zhang, Hao Li, Yuxuan Li, Xiao Jiang, Lin Gan, Guangwen Yang, Lixing You, Zhen Wang, Li Li, Nai-Le Liu, Chao-Yang Lu, Jian-Wei Pan
• Abstract summary: We perform experiments with 50 input single-mode squeezed states with high indistinguishability and squeezing parameters. We observe up to 76 output photon-clicks, which yield an output state space of $1030$ and a sampling rate that is $1014$ faster than using the state-of-the-art simulation strategy and supercomputers.
• Score: 23.8675435287082
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: 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.

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