Isotope engineering of silicon and diamond for quantum information processing

Key roles of isotope engineering in silicon and diamond quantum information processing are discussed. While removal of the background ²⁹Si nuclear spins is proven crucial for extending the coherence time of spin qubits in silicon, removal of the background ²⁸Si, ²⁹Si, and ³⁰Si mass fluctuations is also shown to be important for defining the nuclear magnetic resonance frequencies of donors such as ³¹P in silicon. Effects of removing ¹³C nuclear spins in diamond are also similar. This talk aims to present an overview of the role of silicon isotope engineering in silicon quantum information processing.

The work has been supported by the Grant-in-Aid for Scientific Research and Project for Developing Innovation Systems by MEXT and the JSPS Core-to-Core Project.

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