Laser Security System
Study breakthrough on laser security | Otago Daily Times Online
The discovery of a new way of storing and "echoing" pulses of light is likely to help usher in future long-distance communication systems protected by high-security quantum cryptography.
The research, which has just been published in the prestigious journal Nature, was undertaken by a team of scientists based at the ARC Centre of Excellence in Quantum-Atom Optics at the Australian National University in Canberra.
It was led by Prof Ping Koy Lam.
Dr Jevon Longdell, a physicist at the University of Otago's Jack Dodd Centre for Quantum Technology, is a member of the team.
The scientists demonstrated how photon echoes could be used to create a quantum memory device, with pulses of light captured, stored and released on demand.
Bursts of laser light and a cloud of atoms work as a flexible optical memory.
Such a device would be an important part of a quantum repeater, which could extend the range of secure quantum communication, scientists said.
Quantum cryptography uses photons, which are individual particles of light, and their intrinsic quantum properties to develop an unbreakable coding system.
The approach uses the principles of quantum physics and is regarded as even more secure than current mathematically-based codes.
A quantum system can also detect eavesdropping.
In quantum cryptography, secure information is coded on to light beams which are sent from one point to another.
But present systems cannot operate beyond about 50 to 100km, because, at greater distances, too much information is lost.
Dr Longdell says the new approach is likely to help make quantum communication over thousands of kilometres an eventual reality.
"It makes long-distance quantum cryptography much closer to being realised.
"Before, I thought it might be something that's achievable.
...Holder: DOJ probing WikiLeaks Afghan leak
Holder: DOJ probing WikiLeaks Afghan leakThe Justice Department is taking part in the investigation into how online journalism site WikiLeaks obtained more than 90,000 combat reports from the U.S. military in Afghanistan, Attorney General Eric Holder said Tuesday during a visit to Egypt.
"“The Justice Department is working with the Department of Defense with regard to an investigation concerning who the source of those leaks might be,” Holder said according to wire reports ( Bloomberg / AP ). “Whether there will be any criminal charges brought depends on how the investigation goes.”
DOJ's involvement isn't terribly surprising. While DOD has jurisdiction over people in uniform, such as "person of interest" Pfc. Bradley Manning, DOJ would ultimately have to make the call on charges against civilians.
Whether such charges could be brought against an outlet like WikiLeaks, or its founder, Julian Assange, is unclear. Assange, an Australian citizen, isn't spending much time in the U.S. these days. While some U.S. lawmakers issued statements Monday urging authorities to investigate everyone involved in the leaks, it's far from certain whether the site's conduct would constitute a crime under U.S. law, whether U.S. law applies abroad for these kinds of incidents, whether any other country would extradict Assange or others who could be charged, and even whether other countries would enforce a subpoena in such a case.
How To Build a Laser Security System
Watch this video for a demonstration of "How To Build a Laser Security System". Tocomplete the task, you will need: A laser pointer Get ...
Laser Security System- News
US Missile Shield Plans: Retreat Or Advance?
|
|
NI Technology Updates Outlooks for Apple, Flextronics, Adobe ... Nothing herein should be construed as an offer or solicitation to buy or sell any security. CONTACT: Marcia Martin, Next Inning Technology Research, and more » |
Raytheon looks to the future
|
|
Study breakthrough on laser security Quantum cryptography uses photons, which are individual particles of light, and their intrinsic quantum properties to develop an unbreakable coding system. |
|
Raytheon Starts Developmental Testing of Upgraded Laser-Guided ... Raytheon Company, with 2008 sales of $23.2 billion, is a technology and innovation leader specializing in defense, homeland security and other government and more » |