On-chip quantum interference between silicon photon-pair sources

J. W. Silverstone, D. Bonneau, K. Ohira, N. Suzuki, H. Yoshida, N. Iizuka, M. Ezaki, C. M. Natarajan, M. G. Tanner, R. H. Hadfield, V. Zwiller, Graham David Marshall, J. G. Rarity, J. L. O'Brien, Mark G Thompson

Research output: Contribution to journalArticle (Academic Journal)

302 Citations (Scopus)


Large-scale integrated quantum photonic technologies(1,2) will require on-chip integration of identical photon sources with reconfigurable waveguide circuits. Relatively complex quantum circuits have been demonstrated already(1-7), but few studies acknowledge the pressing need to integrate photon sources and waveguide circuits together on-chip(8,9). A key step towards such large-scale quantum technologies is the integration of just two individual photon sources within a wave-guide circuit, and the demonstration of high-visibility quantum interference between them. Here, we report a silicon-on-insulator device that combines two four-wave mixing sources in an interferometer with a reconfigurable phase shifter. We configured the device to create and manipulate two-colour (non-degenerate) or same-colour (degenerate) path-entangled or path-unentangled photon pairs. We observed up to 100.0 +/- 0.4% visibility quantum interference on-chip, and up to 95 +/- 4% off-chip. Our device removes the need for external photon sources, provides a path to increasing the complexity of quantum photonic circuits and is a first step towards fully integrated quantum technologies.

Original languageEnglish
Pages (from-to)104-108
Number of pages5
JournalNature Photonics
Issue number2
Early online date15 Dec 2013
Publication statusPublished - 1 Feb 2014




Fabricating a photonic quantum computer.

O'Brien, J. L.


Project: Research

Beyond Qubits with Photons (BQP)

O'Brien, J. L.


Project: Research

Cite this

Silverstone, J. W., Bonneau, D., Ohira, K., Suzuki, N., Yoshida, H., Iizuka, N., Ezaki, M., Natarajan, C. M., Tanner, M. G., Hadfield, R. H., Zwiller, V., Marshall, G. D., Rarity, J. G., O'Brien, J. L., & Thompson, M. G. (2014). On-chip quantum interference between silicon photon-pair sources. Nature Photonics, 8(2), 104-108. https://doi.org/10.1038/NPHOTON.2013.339