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.
@article{arxiv.1709.00214,
title = {Silicon photonic processor of two-qubit entangling quantum logic},
author = {R. Santagati and J. W. Silverstone and M. J. Strain and M. Sorel and S. Miki and T. Yamashita and M. Fujiwara and M. Sasaki and H. Terai and M. G. Tanner and C. M. Natarajan and R. H. Hadfield and J. L. O'Brien and M. G. Thompson},
journal= {arXiv preprint arXiv:1709.00214},
year = {2017}
}
Comments
The data from this study are available from the open data repository Figshare at https://doi.org/10.6084/m9.figshare.5464381.v1