Broadband excitation by chirped pulses: application to single electron spins in diamond

Niemeyer, I.; Shim, Jae-Hyeok; Zhang, J.; Suter, Dieter; Taniguchi, Takashi; Teraji, Tokuyuki; Abe, Hiroshi; Onoda, Shinobu; Yamamoto, Takashi; Ohshima, Takeshi; Isoya, Junichi; Jelezko, Fedor

doi:10.1088/1367-2630/15/3/033027

Cited by 17 publications

(13 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the current study, we optimized the T 1 readout by introducing an adiabatic passage (see Supplementary Discussion) in form of a linear chirp pulse (Fig. 3a), which is robust against detuning and microwave driving power44. To compare the performance of different schemes used in T 1 measurement, we extracted the spin contrast from experimental measurement as a function of driving strength (estimated by Rabi oscillations driven on the optically detected magnetic resonance (ODMR) transitions, see Supplementary Fig.…”

Section: Resultsmentioning

confidence: 99%

Optical imaging of localized chemical events using programmable diamond quantum nanosensors

et al. 2017

View full text Add to dashboard Cite

Development of multifunctional nanoscale sensors working under physiological conditions enables monitoring of intracellular processes that are important for various biological and medical applications. By attaching paramagnetic gadolinium complexes to nanodiamonds (NDs) with nitrogen-vacancy (NV) centres through surface engineering, we developed a hybrid nanoscale sensor that can be adjusted to directly monitor physiological species through a proposed sensing scheme based on NV spin relaxometry. We adopt a single-step method to measure spin relaxation rates enabling time-dependent measurements on changes in pH or redox potential at a submicrometre-length scale in a microfluidic channel that mimics cellular environments. Our experimental data are reproduced by numerical simulations of the NV spin interaction with gadolinium complexes covering the NDs. Considering the versatile engineering options provided by polymer chemistry, the underlying mechanism can be expanded to detect a variety of physiologically relevant species and variables.

show abstract

Section: Resultsmentioning

confidence: 99%

Optical imaging of localized chemical events using programmable diamond quantum nanosensors

et al. 2017

View full text Add to dashboard Cite

show abstract

“…17 Recent progress in high-frequency electronics and the very active research field of spin-based quantum computation have reignited the interest in this topic, with applications as ultra-wideband inversion, 18 geometric phase gates, 19 and even the inversion of single electron spins in diamond. 20,21 Our single qubit, however, is operated at much higher frequencies (36 GHz in the present work) than in experiments reported so far, because we combine coherent qubit control with single-shot spin readout, 22 essential for practical quantum information processing. Our adiabatic passage experiments only require a simple frequency modulation, which is available in all microwave sources even at very high frequencies.…”

mentioning

confidence: 94%

High-fidelity adiabatic inversion of a ³¹P electron spin qubit in natural silicon

et al. 2014

View full text Add to dashboard Cite

The main limitation to the high-fidelity quantum control of spins in semiconductors is the presence of strongly fluctuating fields arising from the nuclear spin bath of the host material. We demonstrate here a substantial improvement in single-qubit inversion fidelities for an electron spin qubit bound to a 31 P atom in natural silicon, by applying adiabatic sweeps instead of narrow-band pulses. We achieve an inversion fidelity of 97%, and we observe signatures in the spin resonance spectra and the spin coherence time that are consistent with the presence of an additional exchange-coupled donor. This work highlights the effectiveness of simple adiabatic inversion techniques for spin control in fluctuating environments. P donor electron 7 and nuclear 8 spins in silicon. In any III-V semiconductor, as well as in natural Si, the fluctuating nuclear spin environment is the main factor limiting spin coherence times 9,10 and, importantly, the fidelity of quantum gate operations, with typical fidelities in the range of 55%-75%. 4,7 This is insufficient for fault-tolerant qubit operations, which require fidelities in excess of 99% even in the most optimistic schemes.11 Group IV semiconductors such as Si and C possess spin-zero nuclear isotopes, which can be artificially enriched to create a nearly spin-free environment for spin qubits. Indeed 28 Si has been termed a "semiconductor vacuum" 12 for this reason. Ensemble spin resonance of 31 P donors in isotopically pure 28 Si has shown extraordinarily long coherence times, T 2e % 10 s for the electron 13 and T 2n % 3 h for the nucleus, 14 and it is certainly an exciting prospect to adopt isotopically pure substrates for nanoscale qubit devices. However, the production of nuclear spin-zero environments in isotopically purified semiconductors other than silicon is relatively undeveloped 15 or impossible because of the lack of suitable isotopes. Therefore, methods to maximize qubit control fidelities in the presence of a nuclear spin environment will remain important.In this Letter, we present how adiabatic frequency sweeps can be utilized to control the spin of an electron bound to a single 31 P donor with high-fidelity, in spite of the fluctuating nuclear spins from the 4.7% 29 Si (spin 1/2) in natural silicon. For an inhomogeneously broadened electron spin resonance (ESR) transition at $36 GHz with a linewidth of $12 MHz, we achieved an average electron spin inversion fidelity as high as F I ¼ 97 6 2%, insensitive to fluctuations of the background nuclear field. The method of adiabatic passage has been widely applied in nuclear magnetic resonance 16 and to some extent also in ESR. 17 Recent progress in high-frequency electronics and the very active research field of spin-based quantum computation have reignited the interest in this topic, with applications as ultra-wideband inversion, 18 geometric phase gates, 19 and even the inversion of single electron spins in diamond. 20,21 Our single qubit, however, is operated at much higher frequencies (36 GHz in the present work) t...

show abstract

“…The Fourier transform of the latter is the spectrum of the sample [26,27]. This experiment has been already implemented using NV and can be applied for detecting dc magnetic fields [28][29][30]. Here, we show that we can perform it both in the lab and in the rotating frame by using both CRAB and conventional rectangular pulses.…”

Section: Methodsmentioning

confidence: 95%

Precise qubit control beyond the rotating wave approximation

Scheuer¹,

Kong²,

Said³

et al. 2014

New J. Phys.

View full text Add to dashboard Cite

show abstract

Broadband excitation by chirped pulses: application to single electron spins in diamond

Cited by 17 publications

References 27 publications

Optical imaging of localized chemical events using programmable diamond quantum nanosensors

Optical imaging of localized chemical events using programmable diamond quantum nanosensors

High-fidelity adiabatic inversion of a ³¹P electron spin qubit in natural silicon

Precise qubit control beyond the rotating wave approximation

Contact Info

Product

Resources

About

Broadband excitation by chirped pulses: application to single electron spins in diamond

Cited by 17 publications

References 27 publications

Optical imaging of localized chemical events using programmable diamond quantum nanosensors

Optical imaging of localized chemical events using programmable diamond quantum nanosensors

High-fidelity adiabatic inversion of a 31P electron spin qubit in natural silicon

Precise qubit control beyond the rotating wave approximation

Contact Info

Product

Resources

About

High-fidelity adiabatic inversion of a ³¹P electron spin qubit in natural silicon