Over the past decade, integrated quantum photonic technologies have shown great potential as a platform for studying quantum phenomena and realizing large-scale quantum information processing.
Recently, there have been proposals for utilizing waveguide lattices to implement quantum gates, providing a more compact and robust solution compared to discrete implementation with directional couplers and phase shifters.
A team has reported on the first demonstration of precise control of single photon states on an 11-dimensional continuously-coupled programmable waveguide array.
Through electro-optical control, the array is subdivided into decoupled subcircuits and the degree of on-chip quantum interference can be tuned with a maximum visibility of 0.962 ± 0.013.
Furthermore, they showed simultaneous control of two subcircuits on a single device.
These results demonstrate the potential of using this technology as a building block for quantum information processing applications.
npj Quantum Information, Published online: 03 February 2025; doi:10.1038/s41534-024-00934-6
