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      Quantum computational advantage using photons

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          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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          Author and article information

          Journal
          02 December 2020
          Article
          2012.01625
          f3ccd398-75d3-4865-aba5-0193aa44e216

          http://creativecommons.org/licenses/by/4.0/

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          Custom metadata
          23 pages, 5 figures, supplemental information not included but a link is provided. This work is dedicated to the people in the fight against the COVID-19 outbreak during which the final stage of this experiment was carried out
          quant-ph cond-mat.other physics.optics

          Condensed matter,Quantum physics & Field theory,Optical materials & Optics
          Condensed matter, Quantum physics & Field theory, Optical materials & Optics

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