Influence of Dynamical Decoupling Sequences with Finite-Width Pulses on Quantum Sensing for AC Magnetometry
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2018-11-27 |
| Journal | Physical Review Applied |
| Authors | T. Ishikawa, Akio Yoshizawa, Yasunori Mawatari, Hideyuki Watanabe, Satoshi Kashiwaya |
| Institutions | Nagoya University, National Institute of Advanced Industrial Science and Technology |
| Citations | 14 |
Abstract
Section titled āAbstractāDynamical decoupling sequences with multiple pulses can be considered to\nexhibit filter functions for the time evolution of a qubit superposition state.\nThey contribute to the improvement of coherence time and qubit-phase\naccumulation due to a time-varying field and can thus achieve\nhigh-frequency-resolution spectroscopy. Such behaviors find useful application\nin highly sensitive detection based on qubits for various external fields such\nas a magnetic field. Hence, decoupling sequences are indispensable tools for\nquantum sensing. In this study, we experimentally and theoretically\ninvestigated the effects of finite-width pulses in the sequences on AC\nmagnetometry utilizing nitrogen-vacancy centers in an isotopically-controlled\ndiamond. We revealed that the finite pulse widths cause a deviation of the\noptimum time to acquire the largest phase accumulation due to the sensing field\nfrom that expected by filter functions neglecting the pulse widths, even if the\nwidths are considerably shorter than the time period of the sensing field.\nMoreover, we experimentally demonstrated that the deviation can be corrected by\nan appropriate time-frequency conversion. Our results provide a guideline for\nthe detection of an AC field with an accurate frequency and linewidth in\nquantum sensing with multiple-pulse sequences.\n