Quantum Technology with Diamond Color Defects

by Aharon Blank

Technion

at Physics Colloquium

Mon, 28 Mar 2022, 16:10
Ilse Katz Institute for Nanoscale Science & Technology (51), room 015

Abstract

Unpaired electron spins of nitrogen vacancies (NV) color defects in diamond single crystals are known to have many favorable properties of relevance to quantum devices. For example, their electronic spin triplet states have long coherence times, and the quantum state of the spins can be read-out optically. Another important property is that upon light illumination the spins are pumped to the |0> state reaching high polarization. In this talk I will explore two possible applications of these color defects to quantum technology. (i) The first one is related to their use as a MASER (Microwave Amplifier by Stimulated Emission of Radiation) that produces coherent microwave radiation due to stimulated decay of the spins pumped to the |0> level, down to the |-1> state. Such MASER device can be used as a quantum amplifier for a variety of applications, such as conventional radar, quantum radar and quantum communication. I will present the state-of-the-art in this field and relate to our recent work to make this MASER technology truly practical and useful. (ii) The second application makes use of the NVs as possible candidates for spin-based quantum computers. The main caveats in this approach are the lack of reliable process for accurately placing many NVs in close proximity (~10-20 nm) and the inability to read out and manipulate the quantum state of many closely spaced NVs. I will discuss these limitations and show our recent approach to overcome these issues by mapping out the location of the NVs in 3D manner with high accuracy using Fourier imaging MRI-like techniques.

Created on 23-03-2022 by Kats, Yevgeny (katsye)
Updaded on 23-03-2022 by Kats, Yevgeny (katsye)