Photon in a fibre

Print edition : January 22, 2016

RESEARCHERS at the Vienna Centre for Quantum Science and Technology have demonstrated a nanofibre device that acts as an optical diode, allowing single photons to travel in only one direction. This work has been published in “Physical Review X”.

Light-based (photonic) circuits can potentially be faster and consume less power than electronic circuits. Photonic circuits will require many of the same components found in electronics, such as diodes, which allow light or currents to flow in one direction only. In the prototype developed by the researchers, the passage of individual photons through a fibre can be controlled by their interaction with cold atoms trapped in the vicinity of a nanometer-thin optical fibre. Proof-of-principle experiments have revealed a roughly 20-fold difference in the transmission of light moving in the two directions. The scheme can work on single photons, making it suitable for quantum optical networks, which operate at low levels of light.

R. Ramachandran

A letter from the Editor

Dear reader,

The COVID-19-induced lockdown and the absolute necessity for human beings to maintain a physical distance from one another in order to contain the pandemic has changed our lives in unimaginable ways. The print medium all over the world is no exception.

As the distribution of printed copies is unlikely to resume any time soon, Frontline will come to you only through the digital platform until the return of normality. The resources needed to keep up the good work that Frontline has been doing for the past 35 years and more are immense. It is a long journey indeed. Readers who have been part of this journey are our source of strength.

Subscribing to the online edition, I am confident, will make it mutually beneficial.


R. Vijaya Sankar

Editor, Frontline

Support Quality Journalism
This article is closed for comments.
Please Email the Editor