Chip (Jun 2022)

Quantum advantage with membosonsampling

  • Jun Gao,
  • Xiao-Wei Wang,
  • Wen-Hao Zhou,
  • Zhi-Qiang Jiao,
  • Ruo-Jing Ren,
  • Yu-Xuan Fu,
  • Lu-Feng Qiao,
  • Xiao-Yun Xu,
  • Chao-Ni Zhang,
  • Xiao-Ling Pang,
  • Hang Li,
  • Yao Wang,
  • Xian-Min Jin

Journal volume & issue
Vol. 1, no. 2
p. 100007

Abstract

Read online

Quantum computer, harnessing quantum superposition to boost a parallel computational power, promises to outperform its classical counterparts and offer an exponentially increased scaling. The term “quantum advantage” was proposed to mark the key point when people can solve a classically intractable problem by artificially controlling a quantum system in an unprecedented scale, even without error correction or known practical applications. Boson sampling, a problem about quantum evolutions of multi-photons on multimode photonic networks, as well as its variants, has been considered as a promising candidate to reach this milestone. However, the current photonic platforms suffer from the scaling problems, both in photon numbers and circuit modes. Here, we propose a new variant of the problem, membosonsampling, exploiting the scaling of the problem can be in principle extended to a large scale. We experimentally verify the scheme on a self-looped photonic chip inspired by memristor, and obtain multi-photon registrations up to 56-fold in 750,000 modes with a Hilbert space up to 10254. The results exhibit an integrated and cost-efficient shortcut stepping into the “quantum advantage” regime in a photonic system far beyond previous scenarios, and provide a scalable and controllable platform for quantum information processing.