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Drum RAM for a quantum computer

26.03.2013

Physicists were able to realize this idea by referring to the experience of the pioneers of computer technology, borrowing the general principles of the "quantum RAM" from the drum memory of the 60s. American physicists have created a special memory device that can work as a random access memory for a quantum computer and is similar in principle to the drum memory of the 60s, one of the very first types of RAM in the history of the "computer age", according to an article published in the journal Nature.

"We believe that the rotation of the drum can be used as a kind of local memory for quantum computing systems. We can say that our experiments took place on the verge between classical and quantum systems," said Konrad Lehnert from the National Institute of Standards and Technology USA in Boulder.

Lehnert and his colleagues created one of the possible variants of RAM for future quantum computers, trying to arrange the transfer of qubits - units of information in quantum computing - between individual computing nodes. During the experiments, scientists noticed that microwave radiation, which cooled the connections between the components of a quantum computer, could also be used to store data.

Physicists were able to realize this idea by referring to the experience of the pioneers of computer technology, borrowing the general principles of the "quantum RAM" from the drum memory of the 60s. This memory cell is a miniature "drum" - an aluminum plate, which is continuously cooled by a microwave resonator. Depending on the polarization of the radiation and some other parameters, the "drum" begins to resonate at a certain frequency.

By changing the parameters of these waves, scientists have learned how to record and read the states of qubits connected to a microwave resonator. The relatively high reliability of reading a qubit, exceeding 65%, and its long lifetime inside the "drum" - about 90 microseconds - allow us to hope that such "quantum RAM" cells will help scientists develop a full-fledged quantum computer.

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