High precision single qubit tuning via thermo-magnetic field control


David A. Broadway, Scott E. Lillie, Nikolai Dontschuk, Alastair Stacey, Liam T. Hall, Jean-Philippe Tetienne, and Lloyd C. L. Hollenberg

Appl. Phys. Lett., 112, 103103 (2018)

High precision single qubit tuning via thermo-magnetic field control

Precise control of the resonant frequency of a spin qubit is of fundamental importance to quantum sensing protocols. We demonstrate a control technique on a single nitrogen-vacancy (NV) centre in diamond where the applied magnetic field is modified by fine-tuning a permanent magnet’s magnetisation via temperature control. Through this control mechanism, nanoscale cross-relaxation spectroscopy of both electron and nuclear spins in the vicinity of the NV centre is performed. We then show that through maintaining the magnet at a constant temperature, an order of magnitude improvement in the stability of the NV qubit frequency can be achieved. This improved stability is tested in the polarisation of a small ensemble of nearby 13C spins via resonant cross-relaxation, and the lifetime of this polarisation explored. The effectiveness and relative simplicity of this technique may find use in the realisation of portable spectroscopy and/or hyperpolarisation systems.

University: University of Melbourne

Authors Centre Participants: Mr. David Broadway, Mr. Scott Lillie, Dr. Nikolai Dontschuk, Dr. Jean-Philippe Tetienne, Prof. Lloyd C.L. Hollenberg, Liam T. Hall,

Source: Applied Physics Letters

Publication Type: Refereed Journal article

DOI Link: DOI Link

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