Chip-to-chip quantum photonic interconnect by path-polarization interconversion

Wang, J. et al. (2016) Chip-to-chip quantum photonic interconnect by path-polarization interconversion. Optica, 3(4), pp. 407-413. (doi: 10.1364/OPTICA.3.000407)

Abstract

Integrated photonics has enabled much progress toward quantum technologies. Many applications, e.g., quantum communication, sensing, and distributed cloud quantum computing, require coherent photonic interconnection between separate on-chip subsystems. Large-scale quantum computing architectures and systems may ultimately require quantum interconnects to enable scaling beyond the limits of a single wafer, and toward multi-chip systems. However, coherently connecting separate chips remains a challenge, due to the fragility of entangled quantum states. The distribution and manipulation of entanglement between multiple integrated devices is one of the strictest requirements of these systems. Here, we report, to the best of our knowledge, the first quantum photonic interconnect, demonstrating high-fidelity entanglement distribution and manipulation between two separate photonic chips, implemented using state-of-the-art silicon photonics. Path-entangled states are generated on one chip, and distributed to another chip by interconverting between path and polarization degrees of freedom, via a two-dimensional grating coupler on each chip. This path-to-polarization conversion allows entangled quantum states to be coherently distributed. We use integrated state analyzers to confirm a Bell-type violation of

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Hadfield, Professor Robert and Natarajan, Dr Chandra and Tanner, Dr Michael
• Authors: Wang, J., Bonneau, D., Villa, M., Silverstone, J. W., Santagati, R., Miki, S., Yamashita, T., Fujiwara, M., Sasaki, M., Terai, H., Tanner, M. G., Natarajan, C. M., Hadfield, R. H., O’Brien, J. L., and Thompson, M. G.
• Subjects: Q Science > QC Physics; T Technology > TK Electrical engineering. Electronics Nuclear engineering
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: Optica
• Publisher: Optical Society of America (OSA)
• ISSN: 2334-2536

Project Code	Award No	Project Name	Principal Investigator	Funder's Name	Funder Ref	Lead Dept
64596	1	Engineering Photonic Quantum technologies	Robert Hadfield	Engineering & Physical Sciences Research Council (EPSRC)	EP/L024020/1	ENG - ENGINEERING ELECTRONICS & NANO ENG