Phase-controlled coherent dynamics of a single spin under closed-contour interaction

Abstract

In three-level quantum systems, interference between two simultaneously driven excitation pathways can give rise to effects such as coherent population trapping1,2 and electromagnetically induced transparency3. The possibility to exploit these effects has made three-level systems a cornerstone of quantum optics. Coherent driving of the third available transition forms a closed-contour interaction (CCI), which yields fundamentally new phenomena, including phase-controlled coherent population trapping4,5 and phase-controlled coherent population dynamics6. Despite attractive prospects, prevalent dephasing in experimental systems suitable for CCI driving has made its observation elusive7,8,9,10. Here, we exploit recently developed methods for coherent manipulation of nitrogen–vacancy electronic spins to implement and study highly coherent CCI driving of a single spin. Our experiments reveal phase-controlled quantum interference, reminiscent of electron dynamics on a closed loop threaded by a magnetic flux, which we synthesize from the driving-field phase11. Owing to the nature of the dressed states created under CCI, we achieve nearly two orders of magnitude improvement of the dephasing times, even for moderate drive strengths. CCI driving constitutes a novel approach to coherent control of few-level systems, with potential for applications in quantum sensing or quantum information processing.

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Fig. 1: The CCI scheme and experimental set-up.
Fig. 2: Time-reversal symmetry breaking in closed-contour spin dynamics controlled by global phase Φ.
Fig. 3: Spectrum of the driven NV spin under closed-contour driving.
Fig. 4: Phase-controlled coherence protection.

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Acknowledgements

We thank A. Retzker, N. Aharon, A. Nunnenkamp and H. Ribeiro for fruitful discussions and valuable input. We gratefully acknowledge financial support through the NCCR QSIT, a competence centre funded by the Swiss NSF, through the Swiss Nanoscience Institute, by the EU FP7 project DIADEMS (grant no. 611143) and through SNF Project Grant 169321.

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A.B., J.T. and P.M conceived the experiment. A.B. and J.K. performed the experiment and analysed the data, together with M.K. and P.M.. L.T. and J.T. provided support in measurement software. A.B. and M.K. performed the theoretical modelling of our data. A.B., M.K. and P.M. wrote the paper.

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Correspondence to Patrick Maletinsky.

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Barfuss, A., Kölbl, J., Thiel, L. et al. Phase-controlled coherent dynamics of a single spin under closed-contour interaction. Nature Phys 14, 1087–1091 (2018). https://doi.org/10.1038/s41567-018-0231-8

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