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13 Jan '06

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Fwd: Researchers Develop Quantum Processor
by coderman 13 Jan '06

13 Jan '06

http://www.toptechnews.com/news/Researchers-Develop-Quantum-Processor/story… Researchers Develop Quantum Processor By Jay Wrolstad January 12, 2006 11:57AM A computer chip based on the esoteric science of quantum mechanics has been created by researchers at the University of Michigan. The chip might well pave the way for a new generation of supercomputers. Employing the same semiconductor-fabrication techniques used to create common computer chips, the Michigan team was able to trap a single atom within an integrated chip and control it using electrical signals. ... Electrically charged atoms (ions) for such quantum computers are stored in traps in order to isolate the qubits, a process that is essential for the system to work. The challenge is that current ion traps can hold only a few atoms, or qubits, and are not easily scaled, making it difficult to create a quantum chip that can store thousands or more atomic ions. A string of such atoms, in theory, could store thousands of bits of information. In the chip created at Michigan, which is the size of a postage stamp, the ion is confined in a trap while electric fields are applied. Laser light puts a spin on the ion's free electron, enabling it to flip it between the one or zero quantum states. The spin of the electron dictates the value of the qubit. For example, an up-spin can represent a one, or a down-spin can represent a zero -- or the qubit can occupy both states simultaneously. Applications for Cryptography The quantum processor is made of gallium arsenide in a layered structure and etched with electrodes using the same type of lithography process as those used to create today's computer chips. Each electrode is connected to a separate voltage supply, and these various electrical voltages control the ion by moving as it hovers in a space carved out of the chip. The next step is to build a bigger chip with many more electrodes, so that it can store more ions. There still is a lot of work to be done to learn how to control lots of ions in one of these chips. It won't be nearly as easy as it was with conventional computer chips, but at least we know what to do in principle, Monroe said. "This type of integrated chip structure is significant because it demonstrates a way to scale the quantum computer to bigger systems," Monroe said. "It has applications for processing very large [data sets] such as in cryptography, for example, and there is a lot of interest in this by the government." ===== enjoy those pubkeys while you can suckers! (i'm waiting for someone to suggest 32KBit key sizes. how much RAM does that eat?)

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[arma@mit.edu: Tor security advisory: hidden services can be located quickly]
by Eugen Leitl 13 Jan '06

13 Jan '06

----- Forwarded message from Roger Dingledine <arma(a)mit.edu> -----

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by Errol Tate 12 Jan '06

12 Jan '06

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12 Jan '06

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Russel Tice on NSA
by Eugen Leitl 12 Jan '06

12 Jan '06

http://abcnews.go.com/WNT/Investigation/story?id=1491889 Jan 10, 2006 . Russell Tice, a longtime insider at the National Security Agency, is now a whistleblower the agency would like to keep quiet. For 20 years, Tice worked in the shadows as he helped the United States spy on other people's conversations around the world. "I specialized in what's called special access programs," Tice said of his job. "We called them 'black world' programs and operations." But now, Tice tells ABC News that some of those secret "black world" operations run by the NSA were operated in ways that he believes violated the law. He is prepared to tell Congress all he knows about the alleged wrongdoing in these programs run by the Defense Department and the NSA in the post-9/11 efforts to go after terrorists. "The mentality was we need to get these guys, and we're going to do whatever it takes to get them," he said. Tracking Calls Tice says the technology exists to track and sort through every domestic and international phone call as they are switched through centers, such as one in New York, and to search for key words or phrases that a terrorist might use. "If you picked the word 'jihad' out of a conversation," Tice said, "the technology exists that you focus in on that conversation, and you pull it out of the system for processing." According to Tice, intelligence analysts use the information to develop graphs that resemble spiderwebs linking one suspect's phone number to hundreds or even thousands more. Tice Admits Being a Source for The New York Times President Bush has admitted that he gave orders that allowed the NSA to eavesdrop on a small number of Americans without the usual requisite warrants. But Tice disagrees. He says the number of Americans subject to eavesdropping by the NSA could be in the millions if the full range of secret NSA programs is used. "That would mean for most Americans that if they conducted, or you know, placed an overseas communication, more than likely they were sucked into that vacuum," Tice said. The same day The New York Times broke the story of the NSA eavesdropping without warrants, Tice surfaced as a whistleblower in the agency. He told ABC News that he was a source for the Times' reporters. But Tice maintains that his conscience is clear. "As far as I'm concerned, as long as I don't say anything that's classified, I'm not worried," he said. "We need to clean up the intelligence community. We've had abuses, and they need to be addressed." The NSA revoked Tice's security clearance in May of last year based on what it called psychological concerns and later dismissed him. Tice calls that bunk and says that's the way the NSA deals with troublemakers and whistleblowers. Today the NSA said it had "no information to provide." ABC News' Vic Walter and Avni Patel contributed to this report. -- Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org ______________________________________________________________ ICBM: 48.07100, 11.36820 http://www.ativel.com 8B29F6BE: 099D 78BA 2FD3 B014 B08A 7779 75B0 2443 8B29 F6BE [demime 1.01d removed an attachment of type application/pgp-signature which had a name of signature.asc]

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[declan@well.com: [Politech] New law targets online activities designed "to annoy" others [fs]]
by Eugen Leitl 12 Jan '06

12 Jan '06

Welcome to Teletubby land. ----- Forwarded message from Declan McCullagh <declan(a)well.com> -----

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11 Jan '06

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11 Jan '06

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[arma@mit.edu: Tor 0.1.1.11-alpha is out]
by Eugen Leitl 11 Jan '06

11 Jan '06

----- Forwarded message from Roger Dingledine <arma(a)mit.edu> -----

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