Extending spin coherence times of diamond qubits by high-temperature annealing

Yamamoto, Takashi; Umeda, T.; Watanabe, Kenji; Onoda, Shinobu; Markham, Matthew; Twitchen, Daniel J.; Naydenov, Boris; McGuinness, Liam P.; Teraji, Tokuyuki; Koizumi, Satoshi; Dolde, Florian; Fedder, Helmut; Honert, Jan; Wrachtrup, Jörg; Ohshima, Takeshi; Jelezko, Fedor; Isoya, Junichi

doi:10.1103/physrevb.88.075206

Cited by 139 publications

(182 citation statements)

References 47 publications

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“…The rectangles serve as guide to the eye, depicting the space each techniques approximately covers, with the rounds markers setting the current state-of-the-art of each one. of up to 2.0 ms [25]. This results in an η of around 4 nT with typical values for C, the signal to noise ratio for the NV electron spin detection.…”

mentioning

confidence: 79%

Single spin magnetic resonance

Wrachtrup

Finkler

2016

Journal of Magnetic Resonance

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Different approaches have improved the sensitivity of either electron or nuclear magnetic resonance to the single spin level. For optical detection it has essentially become routine to observe a single electron spin or nuclear spin. Typically, the systems in use are carefully designed to allow for single spin detection and manipulation, and of those systems, diamond spin defects rank very high, being so robust that they can be addressed, read out and coherently controlled even under ambient conditions and in a versatile set of nanostructures. This renders them as a new type of sensor, which has been shown to detect single electron and nuclear spins among other quantities like force, pressure and temperature. Adapting pulse sequences from classic NMR and EPR, and combined with high resolution optical microscopy, proximity to the target sample and nanoscale size, the diamond sensors have the potential to constitute a new class of magnetic resonance detectors with single spin sensitivity. As diamond sensors can be operated under ambient conditions, they offer potential application across a multitude of disciplines. Here we review the different existing techniques for magnetic resonance, with a focus on diamond defect spin sensors, showing their potential as versatile sensors for ultra-sensitive magnetic resonance with nanoscale spatial resolution.

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mentioning

confidence: 79%

Single spin magnetic resonance

Wrachtrup

Finkler

2016

Journal of Magnetic Resonance

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“…14, 15 It was argued that paramagnetic vacancy clusters are primarily responsible for short T 2 of NV − s in the pre-annealed diamonds and that concentration of these vacancy clusters can be greatly reduced by annealing at 1000…”

Section: A Nvmentioning

confidence: 99%

Spin coherence and 14 N ESEEM effects of nitrogen-vacancy centers in diamond with X-band pulsed ESR

Rose

Weis

Tyryshkin

et al. 2017

Diamond and Related Materials

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Pulsed ESR experiments are reported for ensembles of negatively-charged nitrogen-vacancy centers (NV − ) in diamonds at X-band magnetic fields (280-400 mT) and low temperatures (2-70 K). The NV − centers in synthetic type IIb diamonds (nitrogen impurity concentration < 1 ppm) are prepared with bulk concentrations of 2 · 10 13 cm −3 to 4 · 10 14 cm −3 by high-energy electron irradiation and subsequent annealing. We find that a proper post-radiation anneal (1000• C for 60 mins) is critically important to repair the radiation damage and to recover long electron spin coherence times for NV − s. After the annealing, spin coherence times of T2 = 0.74 ms at 5 K are achieved, being only limited by 13 C nuclear spectral diffusion in natural abundance diamonds. At X-band magnetic fields, strong electron spin echo envelope modulation (ESEEM) is observed originating from the central 14 N nucleus. The ESEEM spectral analysis allows for accurate determination of the 14 N nuclear hypefine and quadrupole tensors. In addition, the ESEEM effects from two proximal 13 C sites (second-nearest neighbor and fourth-nearest neighbor) are resolved and the respective 13 C hyperfine coupling constants are extracted.

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“…The relaxation parameters of defects such as the isolated neutral substitutional nitrogen (P1 center) and the negatively charged nitrogen vacancy (NV) center in diamonds were used in our calculations. The latter centers are particularly promising quantum systems with wide applications in physics and biology [37].…”

Section: Rabi Oscillations On Doubly-dressed Spin Statesmentioning

confidence: 99%

Relaxation, decoherence, and steady-state population inversion in qubits doubly dressed by microwave and radiofrequency fields

Saǐko¹,

Fedaruk²,

Markevich³

2014

J. Phys. B: At. Mol. Opt. Phys.

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The coherent dynamics of relaxing spin qubits driven by a classical bichromatic field comprising a strong resonant component and a weaker component with a frequency close to the strong-field Rabi frequency is studied. The double dressing by the bichromatic field modifies dephasing and dissipation processes. We demonstrate that detuning of the weakerfield frequency from the strong-field Rabi frequency prolongs the decay of Rabi oscillations between some doubly dressed states. The sensitivity of Rabi oscillations to the modified detuning-dependent relaxation is illustrated for nitrogen-vacancy qubits in diamond. We discuss a steady-state population inversion of the doubly dressed-state levels.

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Extending spin coherence times of diamond qubits by high-temperature annealing

Cited by 139 publications

References 47 publications

Single spin magnetic resonance

Single spin magnetic resonance

Spin coherence and 14 N ESEEM effects of nitrogen-vacancy centers in diamond with X-band pulsed ESR

Relaxation, decoherence, and steady-state population inversion in qubits doubly dressed by microwave and radiofrequency fields

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