Doped Diamond Deposition for Quantum Applications—Opportunities and Challenges

Diamond is a highly attractive material as a solid-state host for a class of crystal defect spin-based qubits, which exhibit high stability even under ambient conditions. Carbon-12 isotopically purified diamond is also spin free, allowing for exceptionally long coherence times. We will introduce the challenges and opportunities in this field and present the results of our ongoing efforts to improve the charge state stability of defects through the controlled growth of doped diamond and our efforts to identify new defects in diamond with long coherence times and high-quality optical interfaces.