Single-Photon Sources for Optical Communications

A research team at the University of Bristol in the UK has discovered single-photon sources, which will help secure visual communications known as ‘quantum cryptography’.

The research paper has been published in Applied Physics Letters published by the American Institute of Physics.

Fluorescent ‘defect centers’ present in the diamond behave like nano-scale light sources. They are imprisoned in a transparent substance. They need not be stored at super cold cryogenic temperatures or imprisoned in electromagnetic fields to retain stability.

According to J. P. Hadden, a post doctoral student in the Centre for Quantum Photonics, department of electrical and electronic engineering & H. H. Wills Physics Laboratory at the University of Bristol, they can be used as origins of individual photons in safe quantum cryptography schemes.

Defect centers  can also be utilized as building blocks for 'solid-state quantum computers’ using quantum effects to solve difficult issues. The light has to be sourced efficiently from the diamond substance. But the efficiency is reduced by reflection and refraction of light as it goes through the diamond-air interface. The team has recently designed a system that can efficiently etch the designs over the earlier defect centers accurately to about 100nanometers.


Joel Scanlon

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Joel Scanlon

Joel, originally from the UK, emigrated to Australia in 1995 and spent 5 years working in the mining industry as an exploration Geo-technician where he developed skills in GIS Mapping and CAD. Joel also spent a year working underground in a gold/copper mine. Upon moving to the North Coast of NSW, Australia Joel worked as a graphic designer for a leading consultancy firm before starting a successful business providing graphic and web design services to local businesses on the eastern seaboard of Australia. Joel is skilled in project management, content production, design, animation, database and networking, software, and editing. Joel has been with AZoNetwork since its inception in 2000.


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