Journal article

Nonvanishing effect of detuning errors in dynamical-decoupling-based quantum sensing experiments

JE Lang, T Madhavan, J-P Tetienne, DA Broadway, LT Hall, T Teraji, TS Monteiro, A Stacey, LCL Hollenberg

Physical Review A | American Physical Society | Published : 2019

Abstract

Characteristic dips appear in the coherence traces of a probe qubit when dynamical decoupling (DD) is applied in synchrony with the precession of target nuclear spins, forming the basis for nanoscale nuclear magnetic resonance (NMR). The frequency of the microwave control pulses is chosen to match the qubit transition but this can be detuned from resonance by experimental errors, hyperfine coupling intrinsic to the qubit, or inhomogeneous broadening. The detuning acts as an additional static field which is generally assumed to be completely removed in Hahn echo and DD experiments. Here we demonstrate that this is not the case in the presence of finite pulse-durations, where a detuning can dr..

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Grants

Awarded by Australian Research Council (ARC)


Awarded by MEXT, Japan


Awarded by CREST of JST, Japan


Funding Acknowledgements

We acknowledge useful discussions with N. Bar-Gill and N. de Leon. This work was supported by the Australian Research Council (ARC) through Grants No. CE110001027, No. FL130100119, and No. DE170100129. J.E.L. is supported by a U.K. EPSRC DTA studentship. D.A.B. is supported by an Australian Government Research Training Program Scholarship. T.T. acknowledges the support of Grants-in-Aid for Scientific Research (Grant Nos. 15H03980, No. 26220903, and No. 16H06326); the "Nanotechnology Platform Project" of MEXT, Japan; and CREST (Grant No. JPMJCR1773) of JST, Japan.