2005-10-05, 19:42
#1
Kanske det, om man ska tro forskare i Australien:
Både intressant och skrämmande. Intressant för att det är en helt ny teknik, som när/om den blir tillgänglig för allmänheten kommer att revolutionera datoranvändandet. Datorers hastighet kommer inte längre att räknas i GHz, utan i tera- och petahertz. Men samtidigt så betyder det ju att myndigheter som NSA (som ju självklart blir de första som får tillgång till dem) kommer att kunna knäcka alla krypteringsmetoder som finns, lösenord med hundratals tecken kommer att knäckas på nolltid, och så vidare. Så vad tycker ni om det här?
Citat:
Länk: http://www.wired.com/news/technology...n_tophead_1%22
Physicists in Australia have slowed a speeding laser pulse and captured it in a crystal, a feat that could be instrumental in creating quantum computers.
The scientists slowed the laser light pulse from 300,000 kilometers per second to just several hundred meters per second, allowing them to capture the pulse for about a second.
[...]
Slowing down light allows scientists to map information onto it. The information is then transferred from the light to the crystal, Sellars said. Then when the scientists release the light, the information is transferred back onto the beam.
[...]
In the spooky world of quantum mechanics, particles like photons behave in mind-bending fashion, and can actually be oriented up and down simultaneously, until they are observed or measured. This arrangement is known as quantum superposition, and results in a unit of information known as a qubit (quantum bit), instead of the traditional bit.
The processing power of a quantum system -- and it is formidable -- is a direct result of the superposition state. Since the qubit can represent several values at once, a quantum system is exponentially more efficient than its classical counterparts. Just 40 qubits would equal the power of today's supercomputers.
"We're at the borderline from going from a few qubits to many more," said Raymond LaFlamme, director of the Institute for Quantum Computing at the University of Waterloo in Ontario, Canada. "But from a conceptual point of view, we're learning a new force of nature."
Quantum computers will exploit quantum mechanics to perform complex mathematical operations -- like cracking the most complex codes cryptography can dream up -- at blistering speed.
"The process of decryption and modifying information security will be a large application," said LaFlamme. "Entities such as the National Security Agency are very interested in building a quantum machine."
[...]
"The 19th century was the Industrial Age," he said. "The 20th century was hailed as the Information Age. I believe the 21st century will be the Quantum Age."
The scientists slowed the laser light pulse from 300,000 kilometers per second to just several hundred meters per second, allowing them to capture the pulse for about a second.
[...]
Slowing down light allows scientists to map information onto it. The information is then transferred from the light to the crystal, Sellars said. Then when the scientists release the light, the information is transferred back onto the beam.
[...]
In the spooky world of quantum mechanics, particles like photons behave in mind-bending fashion, and can actually be oriented up and down simultaneously, until they are observed or measured. This arrangement is known as quantum superposition, and results in a unit of information known as a qubit (quantum bit), instead of the traditional bit.
The processing power of a quantum system -- and it is formidable -- is a direct result of the superposition state. Since the qubit can represent several values at once, a quantum system is exponentially more efficient than its classical counterparts. Just 40 qubits would equal the power of today's supercomputers.
"We're at the borderline from going from a few qubits to many more," said Raymond LaFlamme, director of the Institute for Quantum Computing at the University of Waterloo in Ontario, Canada. "But from a conceptual point of view, we're learning a new force of nature."
Quantum computers will exploit quantum mechanics to perform complex mathematical operations -- like cracking the most complex codes cryptography can dream up -- at blistering speed.
"The process of decryption and modifying information security will be a large application," said LaFlamme. "Entities such as the National Security Agency are very interested in building a quantum machine."
[...]
"The 19th century was the Industrial Age," he said. "The 20th century was hailed as the Information Age. I believe the 21st century will be the Quantum Age."
Både intressant och skrämmande. Intressant för att det är en helt ny teknik, som när/om den blir tillgänglig för allmänheten kommer att revolutionera datoranvändandet. Datorers hastighet kommer inte längre att räknas i GHz, utan i tera- och petahertz. Men samtidigt så betyder det ju att myndigheter som NSA (som ju självklart blir de första som får tillgång till dem) kommer att kunna knäcka alla krypteringsmetoder som finns, lösenord med hundratals tecken kommer att knäckas på nolltid, och så vidare. Så vad tycker ni om det här?
