Researchers from Toshiba Research Europe Ltd. and the University of Cambridge have announced a quantum device that can create entangled light.

The process starts with a silicon-based device that uses quantum dots inside a block of indium arsenide. Quantum dots are essentially nanocrystals small enough to exist in the quantum confinement regime. When the quantum dot is excited by a laser pulse, two electrons in the indium arsenide are excited. The energy will then be converted into two entangled protons that can be split outside the device.

This news article was written on January 15, 2006, quoting Advanced Imaging Pro.