Enhanced Resolution in Nanoscale NMR via Quantum Sensing with Pulses of Finite Duration
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2017-05-01 |
| Journal | UCL Discovery (University College London) |
| Authors | J. E. Lang, J. Casanova, Z.-Y. Wang, Martin B. Plenio, T. S. Monteiro |
| Institutions | UniversitƤt Ulm, University College London |
| Citations | 18 |
Abstract
Section titled āAbstractāThe nitrogen-vacancy (N-V) color center in diamond is an enormously important platform for the \ndevelopment of quantum sensors, including for single-spin and single-molecule NMR. Detection of weak \nsingle-spin signals is greatly enhanced by repeated sequences of microwave pulses; in these dynamicaldecoupling \ntechniques, the key control parameters swept in the experiment are the time intervals, Ļ, \nbetween pulses. Here, we show that, in fact, the pulse duration tp offers a powerful additional control \nparameter. While a non-negligible tp was previously considered simply a source of experimental error, we \nelucidate here the underlying quantum dynamics: we identify a landscape of quantum-state crossings which \nare usually inactive (closed) but may be controllably activated (opened) by adjusting tp from zero. We \nidentify these crossings with recently observed but unexpected dips (so-called spurious dips) seen in the \nquantum coherence of the N-V spin. With this new understanding, both the position and the strength of \nthese sharp features may be accurately controlled; they coexist with the usual broader coherence dips of \nshort-duration microwave pulses, but their sharpness allows for higher-resolution spectroscopy with \nquantum diamond sensors, or their analogs.
Tech Support
Section titled āTech SupportāOriginal Source
Section titled āOriginal Sourceā- DOI: None