News tagged with photons
Related topics: light , electrons , quantum computing , physical review letters , quantum mechanics
Researchers crack full-spectrum solar challenge
In a paper published in Nature Photonics, U of T Engineering researchers report a new solar cell that may pave the way to inexpensive coatings that efficiently convert the sun's rays to electricity.
Jun 26, 2011 |
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Optical circuit enables new approach to quantum technologies
Professor Jeremy O'Brien, Director of the University of Bristol's Centre for Quantum Photonics, and his Japanese colleagues have demonstrated a quantum logic gate acting on four particles of light -- photons. The researchers ...
Jun 24, 2011 |
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Study finds single photons cannot exceed the speed of light
(PhysOrg.com) -- The rule that nothing can travel faster than the speed of light, c, is one of the most fundamental laws of nature. But since this speed limit has only been experimentally demonstrated for ...
Jun 24, 2011 |
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All-optical quantum computation, step 1: A controlled-NOT photonic gate
(PhysOrg.com) -- The often counterintuitive quantum world of superposition, entanglement, and tunneling can greatly enhance applications as diverse as communication, information processing, and precision measurement. ...
Jun 24, 2011 |
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Quantum eavesdropper steals quantum keys
(PhysOrg.com) -- In quantum cryptography, scientists use quantum mechanical effects to encrypt and then communicate confidential information. Although quantum cryptography codes are unbreakable in principle, even the best ...
Jun 20, 2011 |
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Nanosized diamonds enable progress in retinal prostheses
Research groups in several countries are making progress in retinal prosthesis development. If they achieve their aims, patients who have gone blind, due to loss of their photoreceptors, could recover a better ...
Nanotechnology / Bio & Medicine
Jun 17, 2011 |
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First telecommunications wavelength quantum dot laser on a silicon substrate
A new generation of high speed, silicon-based information technology has been brought a step closer by researchers in the Department of Electronic and Electrical Engineering at UCL and the London Centre for Nanotechnology. ...
Jun 13, 2011 |
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Single Green Fluorescent Protein-expressing cell is basis of living laser device
(PhysOrg.com) -- It sounds like something out of a comic book or a science fiction movie – a living laser – but that is exactly what two investigators at the Wellman Center for Photomedicine at Massachusetts ...
Jun 12, 2011 |
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Silicon waveguide that converts polarization mode of light could speed up photonic circuits operation
Silicon is the dominant material for the fabrication of integrated circuits and is also becoming a popular material for making photonics circuits -- miniaturized circuits that use light instead of electronic ...
Jun 09, 2011 |
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Researchers create light from 'almost nothing'
(PhysOrg.com) -- A group of physicists working out of Chalmers University of Technology in Gothenburg, Sweden, have succeeded in proving what was until now, just theory; and that is, that visible photons could ...
Jun 06, 2011 |
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Singapore researchers invent broadband graphene polarizer
Researchers at the National University of Singapore have invented a graphene-based polarizer that can broaden the bandwidth of prevailing optical fiber-based telecommunication systems.
Jun 06, 2011 |
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Chinese team entangles eight photons, breaking record
In a game of one-upmanship, a Chinese team of physicists has figured out how to entangle eight photons simultaneously and to observe them in action; the previous record was six. In a paper published in arXiv, the team from t ...
Jun 03, 2011 |
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Study raises questions on what causes silicon solar cell degradation
(PhysOrg.com) -- After several hours of exposure to sunlight, silicon solar cells experience light-induced degradation, which can decrease their efficiency by up to 10%. In a new study, scientists have attempted ...
Jun 03, 2011 |
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Nanoscale waveguide for future photonics
The creation of a new quasiparticle called the "hybrid plasmon polariton" may throw open the doors to integrated photonic circuits and optical computing for the 21st century. Researchers with the U.S. Department ...
May 31, 2011 |
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Physicists describe how to make time-reversed light pulses
(PhysOrg.com) -- By taking advantage of the properties of periodic systems, physicists have described how to efficiently time-reverse ultrashort electromagnetic pulses. Since a time-reversed pulse evolves ...
May 31, 2011 |
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