Improving the coherence properties of solid-state spin ensembles via optimized dynamical decoupling

Farfurnik, Demitry; Jarmola, Andrey; Pham, Linh; Wang, Z. H.; Dobrovitski, V. V.; Walsworth, Ronald L.; Budker, Dmitry; Bar‐Gill, Nir

doi:10.1117/12.2227479

Cited by 6 publications

(4 citation statements)

References 38 publications

(47 reference statements)

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“…Both NV sensing and quantum information benefit from many of the same technical improvements. Dynamical decoupling pulse sequences extend T 2 , improving sensitivity and qubit coherence time [79]. Improved light collection and readout fidelity also enhances sensitivity and boosts the entanglement success rate for fluorescence photons from different NVs [80,81].…”

Section: Nv Quantum Informationmentioning

confidence: 99%

Exploring Basic Properties and Applications of Nitrogen-Vacancy Color Centers in Diamond

Kehayias¹

2018

Preprint

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Nitrogen-vacancy (NV) defect centers in diamond have generated much interest for their uses in quantum information and sensing. Despite the ongoing improvements in sensitivity and the range of new applications, much about the NV basic physics remains unresolved, which is important to understand in order to fully exploit potential uses. In this work I describe a series of experiments on NV basic properties, applications, and projects in between. First, I describe an NV singlet absorption spectroscopy experiment, which searched for additional NV electronic states and studied the 1A1 phonon modes. Next, I discuss an NV microwave saturation spectroscopy experiment, which is useful for NV thermometry, removes inhomogeneous broadening, and can yield information about diamond magnetic spin bath dynamics. I then describe an NV relaxation experiment that senses GHz-frequency magnetic noise, which we demonstrated using paramagnetic substitutional nitrogen (P1) centers. Finally, I describe open questions on the NV singlet states, saturation spectroscopy, and relaxation (and how to address them), and report on my ongoing work on using NVs for nuclear polarization and rotation sensing.

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Section: Nv Quantum Informationmentioning

confidence: 99%

Exploring Basic Properties and Applications of Nitrogen-Vacancy Color Centers in Diamond

Kehayias¹

2018

Preprint

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“…This consists of a substitutional nitrogen atom and an adjacent lattice vacancy, having discrete electronic and nuclear spin states with long coherence times up to room temperature. 3 The optical properties of the negativelycharged NV center (NV − ) are highly sensitive to a range of parameters including magnetic field [4][5][6][7][8][9] , electric field 5,10 , temperature 11,12 and pressure (strain). 13 Applications include sensing using a scanning diamond tip 14,15 , nanoscale nuclear magnetic resonance (NMR)/ electron spin resonance (ESR) 16,17 and in biophysics, [18][19][20][21] where robustness and high biocompatibility of diamond makes it an ideal platform for sensing, even within biological samples.…”

Section: Introductionmentioning

confidence: 99%

“…1(a) consists of spin triplet ground and excited states and metastable spin singlet states. 6,9,[24][25][26] . When green laser light is absorbed by an NV in m s =0, a) These authors contributed equally to this work b) Electronic mail: jaluwe@fysik.dtu.dk c) Electronic mail: alexander.huck@fysik.dtu.dk d) Electronic mail: ulrik.andersen@fysik.dtu.dk red fluorescence is emitted from decay back into the triplet ground state.…”

Section: Introductionmentioning

confidence: 99%

Optimal control of a nitrogen-vacancy spin ensemble in diamond for sensing in the pulsed domain

Poulsen,

Clement,

Webb

et al. 2021

Preprint

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Defects in solid state materials provide an ideal, robust platform for quantum sensing. To deliver maximum sensitivity, a large ensemble of non-interacting defects hosting coherent quantum states are required. Control of such an ensemble is challenging due to the spatial variation in both the defect energy levels and in any control field across a macroscopic sample. In this work we experimentally demonstrate that we can overcome these challenges using Floquet theory and optimal control optimization methods to efficiently and coherently control a large defect ensemble, suitable for sensing. We apply our methods experimentally to a spin ensemble of up to 4 × 10 9 nitrogen vacancy (NV) centers in diamond. By considering the physics of the system and explicitly including the hyperfine interaction in the optimization, we design shaped microwave control pulses that can outperform conventional (π-) pulses when applied to sensing of temperature or magnetic field, with a potential sensitivity improvement between 11 and 78%. Through dynamical modelling of the behaviour of the ensemble, we shed light on the physical behaviour of the ensemble system and propose new routes for further improvement.

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“…The level structure and spin-state dependent transitions of the NV center, illustrated in Fig. 1, render the system sensitive to temperature [8,9], pressure [10], electric fields [11,12] and magnetic fields [7], but it has received the most focus for its potential as a magnetometer [7,[13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Investigation and comparison of measurement schemes in the low frequency biosensing regime using solid-state defect centers

Poulsen,

Webb,

Berg-Sørensen

et al. 2021

Preprint

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Ensembles of solid state defects in diamond make promising quantum sensors with high sensitivity and spatiotemporal resolution. The inhomogeneous broadening and drive amplitude variations across such ensembles have differing impacts on the sensitivity depending on the sensing scheme used, adding to the challenge of choosing the optimal sensing scheme for a particular sensing regime. In this work, we numerically investigate and compare the predicted sensitivity of schemes based on continuous-wave (CW) optically detected magnetic resonance (ODMR) spectroscopy, π-pulse ODMR and Ramsey interferometry for sensing using nitrogen-vacancy centers in the low-frequency (< 10 kHz) range typical for signals from biological sources. We show that inhomogeneous broadening has the strongest impact on the sensitivity of Ramsey interferometry, and drive amplitude variations least impact the sensitivity of CW ODMR, with all methods constrained by the Rabi frequency. Based on our results, we can identify three different regions of interest. For inhomogeneous broadening less than 0.3 MHz, typical of diamonds used in state of the art sensing experiments, Ramsey interferometry yields the highest sensitivity. In the regime where inhomogeneous broadening is greater than 0.3 MHz, such as for standard optical grade diamonds or in minaturized integrated devices, drive amplitude variations determine the optimal protocol to use. For low to medium drive amplitude variations, the highest sensitivity is reached using π-pulse ODMR. For high drive amplitude variations, relevant for widefield microscopic imaging, CW ODMR can yield the best sensing performance.

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Improving the coherence properties of solid-state spin ensembles via optimized dynamical decoupling

Cited by 6 publications

References 38 publications

Exploring Basic Properties and Applications of Nitrogen-Vacancy Color Centers in Diamond

Exploring Basic Properties and Applications of Nitrogen-Vacancy Color Centers in Diamond

Optimal control of a nitrogen-vacancy spin ensemble in diamond for sensing in the pulsed domain

Investigation and comparison of measurement schemes in the low frequency biosensing regime using solid-state defect centers

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