Narrow-bandwidth sensing of high-frequency fields with continuous dynamical decoupling

Stark, Alexander; Aharon, Nati; Unden, Thomas; Louzon, Daniel; Huck, Alexander; Retzker, Alex; Andersen, Ulrik L.; Jelezko, Fedor

doi:10.1038/s41467-017-01159-2

Cited by 65 publications

(62 citation statements)

References 51 publications

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“…They indicate that further experimental improvements would readily yield coherence protected dressed states with inhomogeneous dephasing times approaching the T 1 -limit. Such dressed states have recently been establishes as powerful resources for quantum sensing of GHz fields [28,29]. The efficient tunability and coherence protection we demonstrate here for dressed states offer highly interesting avenues for enhanced sensitivities and phase-tuning of the sensing-frequencies for such sensing schemes.…”

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confidence: 72%

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

et al. 2018

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In three-level quantum systems, interference between two simultaneously driven excitation pathways can give rise to effects such as coherent population trapping 1,2 and electromagnetically induced transparency 3 . 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 trapping 4,5 and phase-controlled coherent population dynamics 6 . Despite attractive prospects, prevalent dephasing in experimental systems suitable for CCI driving has made its observation elusive [7][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 phase 11

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confidence: 72%

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

et al. 2018

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“…In this work, we have performed MW field imaging around 2.77-2.97 GHz, however larger dc magnetic fields can be applied to tune the imaging frequency up to hundreds of GHz [16,39,40]. With the addition of a control MW field to perform dynamic decoupling, weak MW fields could be detected up to the 1/T 2 limit [41,42]. With delta-doped NV surface layers, the spatial resolution could be further extended to the sub-micron range [24], or superresolution techniques could be employed to provide resolution down to the nanoscale [43,44].…”

Section: Discussionmentioning

confidence: 99%

Microwave Device Characterization Using a Widefield Diamond Microscope

et al. 2018

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Devices relying on microwave circuitry form a cornerstone of many classical and emerging quantum technologies. A capability to provide in-situ, noninvasive and direct imaging of the microwave fields above such devices would be a powerful tool for their function and failure analysis. In this work, we build on recent achievements in magnetometry using ensembles of nitrogen vacancy centers in diamond, to present a widefield microwave microscope with few-micron resolution over a millimeterscale field of view, 130 nT Hz −1/2 microwave amplitude sensitivity, a dynamic range of 48 dB, and sub-ms temporal resolution. We use our microscope to image the microwave field a few microns above a range of microwave circuitry components, and to characterize a novel atom chip design. Our results open the way to high-throughput characterization and debugging of complex, multicomponent microwave devices, including real-time exploration of device operation.Microwave (MW) devices play a critical role in telecommunications, defence, and quantum technologies. Device characterization via high resolution MW field imaging is a long-standing goal [1][2][3], which promises to overcome the limitations of conventional characterization techniques. For example, it is difficult to identify internal features of complex devices using S-parameter measurements of reflection and transmission through external device ports [4,5]. A high-throughput MW imaging method would allow for fast prototype iteration, and for more adventurous development of novel device architectures. Furthermore, MW imaging is of interest for spin-wave imaging in magnonic systems [6,7], is under investigation for medical imaging [8,9], and can be used to characterize materials [10] and biological samples [11]. In recent years, alkali vapor cells with atoms in the ground [12][13][14][15][16] or highly excited Rydberg [17][18][19] states, and nitrogen-vacancy (NV) centers in diamond [20-23] have shown promise for intrinsically calibrated MW imaging in simple, vacuum-and cryogen-free environments. Ensembles of NVs in a widefield diamond microscope [24][25][26][27][28] provide an excellent balance between the sensitivity and wide field of view (FOV) offered by vapor cells and the nanoscale spatial resolution of single NV centers [29], and so far have been primarily employed for imaging static and low-frequency magnetic fields. In this work, we demonstrate high-throughput widefield diamond microscopy for MW device characterization, enabled by a step-change we have achieved in microscope performance.Our microscope integrates advances in camera speed, experiment control, novel diamond material, laser illu-

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“…2 * Rabi oscillations are easier to interpret but may give a longer dephasing time than one corresponding to the width of ODMR resonance [20]. We will call dephasing time measure by this method 'effective coherence time'.…”

Section: Coherence Properties Of Diamond Platesmentioning

confidence: 99%

Spin properties of NV centers in high-pressure, high-temperature grown diamond

et al. 2018

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The sensitivity of magnetic and electric field sensors based on nitrogen-vacancy (NV) center in diamond strongly depends on the available concentration of NV and their coherence properties. Achieving high coherence times simultaneously with high concentration is a challenging experimental task. Here, we demonstrate that by using a temperature gradient method of high-pressure, high-temperature growing technique, one can achieve nearly maximally possible dephasing T 2 * times, limited only by carbon nuclear spins at low nitrogen concentrations or nitrogen electron spin at high nitrogen concentrations. Hahn-echo T 2 coherence times were also investigated and found to demonstrate reasonable values. Thus, the high-pressure, high-temperature technique is a strong contender to the popular chemical vapor deposition method in the development of high-sensitivity, diamond-based sensors.

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Narrow-bandwidth sensing of high-frequency fields with continuous dynamical decoupling

Cited by 65 publications

References 51 publications

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

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

Microwave Device Characterization Using a Widefield Diamond Microscope

Spin properties of NV centers in high-pressure, high-temperature grown diamond

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