Scaling up the quantum chip

MIT News  July 8, 2020
A team of researchers in the US (MIT, Sandia National Laboratory) have developed a process to manufacture and integrate “artificial atoms,” with photonic circuitry, producing the largest quantum chip of its type. They used a hybrid approach, in which carefully selected “quantum micro chiplets” containing multiple diamond-based qubits are placed on an aluminum nitride photonic integrated circuit. They built a 128-qubit system. The artificial atoms in the chiplets consist of color centers in diamonds. The team filled the spaces with germanium and silicon. Each center functions as an atom-like emitter whose spin states can form a qubit. The artificial atoms emit photons, that carry the quantum information represented by the qubit. They used a modular and hybrid approach so they could choose the best material suitable for each component. Semiconductor fabrication techniques to make chiplets and the integration on a photonic circuit is analogous to an electronic integrated circuit. The research is a significant contribution for scalable quantum processors…read more. TECHNICAL ARTICLE

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