Macquarie University
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Coupling nitrogen vacancy centre spins in nanodiamonds to external fields

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posted on 2022-03-28, 18:04 authored by Sarath Raman Nair
This thesis focuses on the spin physics of nitrogen-vacancy (NV) centres in nanodiamonds (NDs) via their coupling to external fields. In the first part, we theoretically investigate the feasibility of coupling a ND with a high density of NV centres to a gap-tunable flux qubit. We calculate the optimum position including the tolerance for maximizing the coupling and calculate its dependence on the orientation of the ND. We demonstrate that the coherent coupling of a 150-nm ND containing many (10³) NV centres and a flux qubit with dephasing time of ~1 μs is feasible. In the second part, we investigate the spin-coherence properties of NV centres in NDs and discuss them in the context of the NVs-to-flux qubit coupling. In particular, we manipulate the NV spins via an external microwave field using two distinct methods. The first, more conventional method employs a thin wire in direct contact with the sample as the microwave antenna. The second method has been developed by our group. It uses a cavity to produce the microwave field at the position of the NV spins with the advantage over the wire architecture of addressing the NV centre spins, without sample heating and over macroscopic spatial distances (milli-meters versus micro-meters).


Table of Contents

1. Introduction -- 2. Nitrogen-vacancy colour centres in diamond -- 3. Coupling nanodiamond NV centres to a superconducting flux qubit -- 4. Experimental methods and setup -- 5. Coupling nanodiamond NV centre to the MW field -- 6. Conclusion and future outlooks.


Empirical thesis. Bibliography: pages 57-63

Awarding Institution

Macquarie University

Degree Type

Thesis MRes


MRes, Macquarie University, Faculty of Science and Engineering, Department of Physics and Astronomy

Department, Centre or School

Department of Physics and Astronomy

Year of Award


Principal Supervisor

Thomas Volz


Copyright Sarath Raman Nair 2016. Copyright disclaimer:




1 online resource (xii, 63 pages) colour illustrations

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