Tunable and Transferable Diamond Membranes for Integrated Quantum Technologies

• URL: http://arxiv.org/abs/2109.11507v1
• Date: Thu, 23 Sep 2021 17:18:39 GMT
• Title: Tunable and Transferable Diamond Membranes for Integrated Quantum Technologies
• Authors: Xinghan Guo, Nazar Delegan, Jonathan C. Karsch, Zixi Li, Tianle Liu, Robert Shreiner, Amy Butcher, David D. Awschalom, F. Joseph Heremans, Alexander A. High
• Abstract summary: nanoscale-thick uniform diamond membranes are synthesized via "smart-cut" and isotopically (12C) purified overgrowth. Within 110 nm thick membranes, individual germanium-vacancy (GeV-) centers exhibit stable photoluminescence at 5.4 K and average optical transition linewidths as low as 125 MHz. This platform enables the straightforward integration of diamond membranes that host coherent color centers into quantum technologies.
• Score: 48.634695885442504
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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 (12C) purified overgrowth. These membranes have tunable thicknesses (demonstrated 50 nm to 250 nm), are deterministically transferable, have bilaterally atomically flat surfaces (Rq <= 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-) centers exhibit stable photoluminescence at 5.4 K and average optical transition linewidths as low as 125 MHz. The room temperature spin coherence of individual nitrogen-vacancy (NV-) centers shows Ramsey spin dephasing times (T2*) and Hahn echo times (T2) as long as 150 us and 400 us, respectively. This platform enables the straightforward integration of diamond membranes that host coherent color centers into quantum technologies.

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