Deep Three-Dimensional Solid-State Qubit Arrays with Long-Lived Spin Coherence
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2019-12-03 |
| Journal | Physical Review Applied |
| Authors | C. J. Stephen, B.L. Green, Y. N. D. Lekhai, Weng L, Hill P |
| Institutions | University of Oxford, University of Strathclyde |
| Citations | 40 |
Abstract
Section titled āAbstractāThree-dimensional arrays of silicon transistors increase the density of bits.\nSolid-state qubits are much larger so could benefit even more from using the\nthird dimension given that useful fault-tolerant quantum computing will require\nat least 100,000 physical qubits and perhaps one billion. Here we use laser\nwriting to create 3D arrays of nitrogen-vacancy centre (NVC) qubits in diamond.\nThis would allow 5 million qubits inside a commercially available 4.5x4.5x0.5\nmm diamond based on five nuclear qubits per NVC and allowing $(10 \mu m)^3$ per\nNVC to leave room for our laser-written electrical control. The spin coherence\ntimes we measure are an order of magnitude longer than previous laser-written\nqubits and at least as long as non-laser-written NVC. As well as NVC quantum\ncomputing, quantum communication and nanoscale sensing could benefit from the\nsame platform. Our approach could also be extended to other qubits in diamond\nand silicon carbide.\n