Quantum device and method for manufacturing quantum device

A method for manufacturing a quantum device, comprising:

• a process of bonding a second substrate that has a refractive index higher than the refractive index of a first substrate, to a first surface of the first substrate;
• a process of processing the second substrate to form a plurality of nanopillars arranged in a first direction parallel to the first surface;
• a process of forming color centers in each of the plurality of nanopillars;
• and
• a process of forming electrode pairs for each of the color centers, wherein
• each of the plurality of nanopillars is inclined from the first direction, and extends in a second direction inclined from a normal direction of the first surface, and
• electric fields are applied to the color centers from the electrode pairs.