Silicon photonic processor of two-qubit entangling quantum logic

Raffaele Santagati, Joshua W. Silverstone, M. J. Strain, M. Sorel, S. Miki, T. Yamashita, M. Fujiwara, M. Sasaki, H. Terai, Michael George Tanner, C. M. Natarajan, Robert H. Hadfield, Jeremy L. O'Brien, Mark G. Thompson

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)
35 Downloads (Pure)


Entanglement is a fundamental property of quantum mechanics, and is a primary resource in quantum information systems. Its manipulation remains a central challenge in the development of quantum technology. In this work, we demonstrate a device which can generate, manipulate, and analyse two-qubit entangled states, using miniature and mass-manufacturable silicon photonics. By combining four photon-pair sources with a reconfigurable six-mode interferometer, embedding a switchable entangling gate, we generate two-qubit entangled states, manipulate their entanglement, and analyse them, all in the same silicon chip. Using quantum state tomography, we show how our source can produce a range of entangled and separable states, and how our switchable controlled-Z gate operates on them, entangling them or making them separable depending on its configuration.

Original languageEnglish
Article number114006
JournalJournal of Optics
Issue number11
Publication statusPublished - 17 Oct 2017


  • entanglement
  • integrated quantum information processing
  • photonic qubits
  • quantum photonics
  • silicon quantum photonics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics


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