Séminaire de Hamish Taylor

Abstract:

Developing high bandwidth portable quantum sensors is of significant importance for both terrestrial and satellite communications. The nitrogen vacancy centre in diamond is a popular quantum sensing platform for its relative simplicity and wide range of acceptable operating conditions, but suffers from a limited instantaneous bandwidth due to the narrow MHz-scale linewidth of the resonance. In our work, we present a magnetic quantum sensing scheme utilising continuous quantum heterodyne sensing with strong optical and microwave driving, achieving MHz-scale instantaneous bandwidth with a sensitivity of 61 pT/√Hz in a 3x3x0.3 mm diamond. We then demonstrate expansion of the detection bandwidth by employing a strong magnetic gradient. Rather than spatially-resolved detection of the diamond fluorescence, we employ individually modulated microwave control fields in our heterodyne scheme, which allows for code-division multiplexing of the PL signal. The use of this strong gradient and multiplexing scheme expands the simultaneous detection bandwidth to over 10 GHz, over which we achieve a mean sensitivity of 48 nT/√Hz.

 

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