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Toward Mass-Producible Quantum Computers


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The process for positioning quantum bits in diamond optical circuits could work at large scales.

A team of researchers from the Massachusetts Institute of Technology, Harvard University, and Sandia National Laboratories reports a new technique for creating targeted defects in diamond materials, which could benefit diamond-based quantum computing devices.

Credit: MIT News

Researchers at the Massachusetts Institute of Technology (MIT), Harvard University, and Sandia National Laboratories have developed a new method for generating targeted defects in complex diamond structures, which could help lead to the development of practical, diamond-based quantum computing devices.

The MIT-Harvard team planed a synthetic diamond to a thickness of 200 nanometers, and then etched optical cavities into the diamond's surface to increase the luminosity of the defects' light emissions. The Sandia researchers then shot 20 to 30 silicon ions into each optical cavity, and afterwards the MIT-Harvard Team fired electrons into the diamond to produce more vacancies, and heated the material to induce silicon-vacancy bonding.

The researchers say the method has yielded defects within 50 nanometers of their ideal positions, on average.

"The dream scenario in quantum information processing is to make an optical circuit to shuttle photonic qubits and then position a quantum memory wherever you need it," says MIT professor Dirk Englund.

From MIT News
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