Format

Send to

Choose Destination
Nat Commun. 2015 Aug 6;6:7948. doi: 10.1038/ncomms8948.

Qubit entanglement between ring-resonator photon-pair sources on a silicon chip.

Author information

1
Centre for Quantum Photonics, H. H. Wills Physics Laboratory and Department of Electrical and Electronic Engineering, University of Bristol, Merchant Venturers Building, Woodland Road, Bristol BS8 1UB, UK.
2
Institute of Photonics, Department of Physics, University of Strathclyde, Wolfson Centre, 106 Rottenrow East, Glasgow G4 0NW, UK.
3
School of Engineering, University of Glasgow, James Watt South Building, Glasgow G12 8QQ, UK.

Abstract

Entanglement--one of the most delicate phenomena in nature--is an essential resource for quantum information applications. Scalable photonic quantum devices must generate and control qubit entanglement on-chip, where quantum information is naturally encoded in photon path. Here we report a silicon photonic chip that uses resonant-enhanced photon-pair sources, spectral demultiplexers and reconfigurable optics to generate a path-entangled two-qubit state and analyse its entanglement. We show that ring-resonator-based spontaneous four-wave mixing photon-pair sources can be made highly indistinguishable and that their spectral correlations are small. We use on-chip frequency demultiplexers and reconfigurable optics to perform both quantum state tomography and the strict Bell-CHSH test, both of which confirm a high level of on-chip entanglement. This work demonstrates the integration of high-performance components that will be essential for building quantum devices and systems to harness photonic entanglement on the large scale.

Supplemental Content

Full text links

Icon for Nature Publishing Group Icon for PubMed Central
Loading ...
Support Center