Dec. 5th, 2014

yoginka: (thinking)
Статья для меня оказалась очень интересной, кое-что прояснилось, кое-что новое есть.
(http://www.scientificamerican.com/article/quest-for-quantum-computers-heats-up/)
"In 1997, physicist Alexei Kitaev of the California Institute of Technology in Pasadena proposed a more radical approach: make qubits out of anyons, which are states of matter that arise from the collective properties of many particles, yet behave as just one particle. Some anyons have another special property: their quantum state reveals a history of their recent interactions. If these anyons were used as qubits, Kitaev argued, the order of their interactions could encode information. And because this encoding is effectively spread throughout the system, the qubits would have a natural protection against errors arising in any individual part.

Known as 'topological qubits', these entities remain theoretical, but the idea shows enough promise that Microsoft and a number of other companies are investing in efforts to create them in the laboratory."

"it is impossible to copy a qubit without destroying its quantum state. But qubits can be compared, so theorists have tried to devise correction schemes that ask various pairs of qubits whether they have the same or different values, and then use the answers to deduce whether individual qubits have gone wrong."
yoginka: (thinking)
(Начало здесь: http://yoginka.livejournal.com/369258.html)

(http://www.newscientist.com/article/mg22429983.300-google-and-nasa-ride-dwave-to-a-quantum-future.html?full=true#.VIJMm_im20x)

"Rather than shunting qubits through the quantum analogue of the logic gates found in regular computers, it translates problems into a landscape of hills and valleys. D-Wave's qubits explore this landscape to settle on the lowest energy state, which corresponds to the solution. For this to work, the qubits must be cooled as close to absolute zero as possible – the chips are housed in a custom fridge the size of a small room.

However, critics said it wasn't clear the energy-landscape approach would provide an advantage, and had doubts that D-Wave's computers are properly quantum."

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