Hyperfine spectroscopy in a quantum-limited spectrometer

Probst, Sebastian; Zhang, Gengli; Rančić, Miloš; Ranjan, V.; Dantec, Marianne Le; Zhang, Zhonghan; Albanese, B.; Doll, Andrin; Liu, Ren‐Bao; Morton, John J. L.; Chanelière, Thierry; Goldner, Philippe; Vion, Denis; Estève, D.; Bertet, Patrice

doi:10.5194/mr-1-315-2020

Cited by 15 publications

(3 citation statements)

References 52 publications

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“…Furthermore, our measurements reveal an additional decrease in the fitted T 2 at the very lowest values of ∂f /∂B 0 corresponding to B 0 4 mT, which we ascribe to periodic electron spin echo envelope modulation (ESEEM) from 29 Si nuclei in the crystal matrix. Simulations of the ESEEM performed using EasySpin [26] accounting for this are presented in the Supplementary Materials, and the same effect has been observed recently in Bi:Si [27].…”

Section: Spin Linewidth and Coherencesupporting

confidence: 72%

Spin coherence of near-surface ionised $^{125}$Te$^+$ donors in silicon

Šimėnas¹,

O'Sullivan²,

Kennedy³

et al. 2021

Preprint

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Impurity spins in crystal matrices are promising components in quantum technologies, particularly if they can maintain their spin properties when close to surfaces and material interfaces. Here, we investigate an attractive candidate for microwave-domain applications, the spins of group-VI 125 Te + donors implanted into natural Si at depths of 20 and 300 nm. We examine spin activation yield, relaxation (T1) and coherence times (T2) and show how a zero-field 3.5 GHz 'clock transition' extends spin coherence times to over 1 ms and narrows the inhomogeneous spin linewidth to 0.6 MHz. We show that surface band-bending can be used to ionise Te to spin-active Te + state, and that coherence times of near-surface donors are comparable to the bulk. We demonstrate initialization protocols using optical illumination to generate excess Te + . These results show that 125 Te + is a promising system for silicon-based spin qubits and ensemble quantum memories.

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Section: Spin Linewidth and Coherencesupporting

confidence: 72%

Spin coherence of near-surface ionised $^{125}$Te$^+$ donors in silicon

Šimėnas¹,

O'Sullivan²,

Kennedy³

et al. 2021

Preprint

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“…Here A 0 represents the limiting echo amplitude at zero delay, and V ESEEM (τ, T W ) corresponds to the electron spin echo envelope modulation (ESEEM) caused by the magnetic dipole-dipole interaction of the Er electron spins and the proximal 183 W nuclear spins. This is a well-defined temporal modulation that depends only on the orientation and magnitude of the applied magnetic field and has already been determined experimentally for the m I = |+ 3 /2 electron-spin transition studied here [40]. Meanwhile, the decaying component of the echo signal contains the coefficients 0 , S SD , R S , and T 1 .…”

Section: Spectral Diffusion Modelsupporting

confidence: 62%

“…4(a) and 4(b). Fortunately, the ESEEM parameters have already been measured and published for the sample and experimental configuration used here [40].…”

Section: Echo Measurementsmentioning

confidence: 99%

Electron-spin spectral diffusion in an erbium doped crystal at millikelvin temperatures

et al. 2022

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Erbium doped crystals offer a versatile platform for hybrid quantum devices because they combine magnetically sensitive electron-spin transitions with telecom-wavelength optical transitions. At the high doping concentrations necessary for many quantum applications, however, strong magnetic interactions of the electronspin bath lead to excess spectral diffusion and rapid decoherence. Here we lithographically fabricate a 4.4 GHz superconducting planar microresonator on a CaWO 4 crystal doped with Er ions at a concentration of 20 ppm relative to Ca. Using the microwave resonator, we characterize the spectral diffusion processes that limit the electron-spin coherence of Er ions at millikelvin temperatures by applying two-and three-pulse echo sequences. The coherence time shows a strong temperature dependence, reaching 1.3 ms at 23 mK for an electron-spin transition of 167 Er.

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