Silicon photonic processor of two-qubit entangling quantum logic

R. Santagati*, J. W. Silverstone, M. J. Strain, Marc Sorel, Shigehito Miki, Taro Yamashita , M. Fujiwara, Masahide Sasaki, H. Terai, M. G. Tanner, C. M. Natarajan, R. H. Hadfield, J. L. O'Brien, M. G. Thompson

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

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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
Number of pages8
JournalJournal of Optics
Issue number11
Early online date17 Oct 2017
Publication statusPublished - Nov 2017

Structured keywords

  • Bristol Quantum Information Institute
  • QETLabs
  • Photonics and Quantum


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


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