Tunable and Transferable Diamond Membranes for Integrated Quantum Technologies.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 34894697.
- Also identified by DOI 10.1021/acs.nanolett.1c03703 and PMC identifier 8704172.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Color centers in diamond are widely explored as qubits in quantum technologies. However, challenges remain in the effective and efficient integration of these diamond-hosted qubits in device heterostructures. Here, nanoscale-thick uniform diamond membranes are synthesized via "smart-cut" and isotopically (<sup>12</sup>C) purified overgrowth. These membranes have tunable thicknesses (demonstrated 50 to 250 nm), are deterministically transferable, have bilaterally atomically flat surfaces (<i>R<sub>q</sub></i> ≤ 0.3 nm), and bulk-diamond-like crystallinity. Color centers are synthesized via both implantation and in situ overgrowth incorporation. Within 110-nm-thick membranes, individual germanium-vacancy (GeV<sup>-</sup>) centers exhibit stable photoluminescence at 5.4 K and average optical transition line widths as low as 125 MHz. The room temperature spin coherence of individual nitrogen-vacancy (NV<sup>-</sup>) centers shows Ramsey spin dephasing times (<i>T</i><sub>2</sub><sup>*</sup>) and Hahn echo times (<i>T</i><sub>2</sub>) as long as 150 and 400 μs, respectively. This platform enables the straightforward integration of diamond membranes that host coherent color centers into quantum technologies.
Medical subject headings
- Quantum Theory