Journal article

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, Lloyd CL Hollenberg

Applied Physics Letters | AIP Publishing | Published : 2018


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 polarisatio..

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Awarded by Australian Research Council (ARC) under the Centre of Excellence scheme

Awarded by ARC Laureate Fellowship

Awarded by ARC

Funding Acknowledgements

The original idea of temperature controlled magnetic scanning was brought to our attention by H. J. Mamin.<SUP>24</SUP> This work was supported in part by the Australian Research Council (ARC) under the Centre of Excellence scheme (Project No. CE110001027). This work was performed in part at the Melbourne Centre for Nanofabrication (MCN) in the Victorian Node of the Australian National Fabrication Facility (ANFF). L.C.L.H. acknowledges the support of an ARC Laureate Fellowship (Project No. FL130100119). J.-P.T. acknowledges support from the ARC through the Discovery Early Career Researcher Award scheme (DE170100129). J.-P.T. and L.T.H. acknowledge support from the University of Melbourne through the Early Career Researcher Grant scheme. D.A.B. and S.E.L. are supported by an Australian Government Research Training Program Scholarship.