Google Play icon

Researchers switch a quantum light source in a superfast way

Share
Posted September 27, 2013
Scientists from the FOM Foundation, the University of Twente and at the Institute for Nanoscience and Cryogenics in France have shown that light sources which usually emit light randomly can be coaxed to emit an ultrashort burst of light at a desired moment in time. Their theoretical results were published on 25 September in Optics Express.
The superfast emission of a light source
The light source is embedded in an optical resonator where it spontaneously emits a photon. During the emission of the photon the favoured colour of the resonator is quickly switched (symbolised by a hammer) to match the colour of the light source. During this short interval the light source is triggered to emit an burst of photons within a desired moment in time. Credit: Fundamental Research on Matter (FOM)

Usually, an elementary light source – such as an excited atom or molecule – emits light at an unpredictable instance in time. This spontaneous emission of light is a fundamental process within applications such as LEDs and lasers. However, for other applications it is desirable to receive single photons (light) at a specific moment with as little uncertainty as possible. For instance, this property is crucial for ultra-secure communication using quantum cryptography. Therefore, an important research goal is to fabricate a quantum light source that emits a single photon exactly at a desired moment in time.

Switching light emission

The average emission time of quantum light sources can be reduced by locating them in various nanostructures, such as optical resonators or waveguides. The smallest uncertainty in the emission time is then limited by the type of nanostructure used and the variations in the preparation time of the emitter.

 

Read more at: Phys.org

Featured news from related categories:

Technology Org App
Google Play icon
86,010 science & technology articles

Most Popular Articles

  1. Universe is a Sphere and Not Flat After All According to a New Research (November 7, 2019)
  2. NASA Scientists Confirm Water Vapor on Europa (November 19, 2019)
  3. This Artificial Leaf Turns Atmospheric Carbon Dioxide Into Fuel (November 8, 2019)
  4. How Do We Colonize Ceres? (November 21, 2019)
  5. Scientists created a wireless battery free computer input device (6 days old)

Follow us

Facebook   Twitter   Pinterest   Tumblr   RSS   Newsletter via Email