A molecular quantum spin network controlled by a single qubit

Schlipf, Lukas; Oeckinghaus, Thomas; Xu, Kebiao; Dasari, Durga Bhaktavatsala Rao; Zappe, Andrea; Oliveira, Felipe Fávaro de; Kern, Bastian; Azarkh, Mykhailo; Drescher, Malte; Ternes, Markus; Kern, Klaus; Wrachtrup, Jörg; Finkler, Amit

doi:10.1126/sciadv.1701116

Cited by 59 publications

(61 citation statements)

References 49 publications

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“…Unlike the frequency-sweeping method 14 , 15 , 16 , 19 , 20 , where the microwave frequency can be easily tuned, the microwave power is limited by the microwave amplifier and the transform efficiency of the waveguide. Here, by using a proper designed coplanar waveguide, a Rabi frequency up to ~400 MHz was realized (see Fig.…”

Section: Resultsmentioning

confidence: 99%

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Nanoscale zero-field electron spin resonance spectroscopy

Kong¹,

Zhao²,

Ye³

et al. 2018

Nat Commun

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Electron spin resonance (ESR) spectroscopy has broad applications in physics, chemistry, and biology. As a complementary tool, zero-field ESR (ZF-ESR) spectroscopy has been proposed for decades and shown its own benefits for investigating the electron fine and hyperfine interaction. However, the ZF-ESR method has been rarely used due to the low sensitivity and the requirement of much larger samples than conventional ESR. In this work, we present a method for deploying ZF-ESR spectroscopy at the nanoscale by using a highly sensitive quantum sensor, the nitrogen vacancy center in diamond. We also measure the nanoscale ZF-ESR spectrum of a few P1 centers in diamond, and show that the hyperfine coupling constant can be directly extracted from the spectrum. This method opens the door to practical applications of ZF-ESR spectroscopy, such as investigation of the structure and polarity information in spin-modified organic and biological systems.

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Section: Resultsmentioning

confidence: 99%

“…4a, b ), will be easily used. Second, unlike the inner P1 centers, which are restricted by the diamond lattice and have only four orientations, the external nitroxides are much more disordered and can be oriented in any direction 16 , 20 . The simulated spectra with different orientations of nitroxide are given in Fig.…”

Section: Resultsmentioning

confidence: 99%

Nanoscale zero-field electron spin resonance spectroscopy

Kong¹,

Zhao²,

Ye³

et al. 2018

Nat Commun

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“…Among them, the NV center is more promising for biological applications because of the compatibility with ambient conditions (5)(6)(7). However, the current spectral resolution of those techniques is on the orders of megahertz (3)(4)(5)(6)(7)(8)(9)(10)(11)(12). It is insufficient to resolve molecules of slightly different structures (13) or local polarity profiles (14).…”

Section: Introductionmentioning

confidence: 99%

Kilohertz electron paramagnetic resonance spectroscopy of single nitrogen centers at zero magnetic field

Kong

Zhao

et al. 2020

Sci. Adv.

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Electron paramagnetic resonance (EPR) spectroscopy is among the most important analytical tools in physics, chemistry, and biology. The emergence of nitrogen-vacancy (NV) centers in diamond, serving as an atomic-sized magnetometer, has promoted this technique to single-spin level, even under ambient conditions. Despite the enormous progress in spatial resolution, the current megahertz spectral resolution is still insufficient to resolve key heterogeneous molecular information. A major challenge is the short coherence times of the sample electron spins. Here, we address this challenge by using a magnetic noise–insensitive transition between states of different symmetry. We demonstrate a 27-fold narrower spectrum of single substitutional nitrogen (P1) centers in diamond with a linewidth of several kilohertz, and then some weak couplings can be resolved. Those results show both spatial and spectral advances of NV center–based EPR and provide a route toward analytical (EPR) spectroscopy at the single-molecule level.

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“…Although the light intensity reaching the sample is reduced by the total internal reflection geometry used in this protocol, the evanescent wave at the sample's surface may be sufficient to excite the sample. This may cause problems when samples that absorb green light are measured (e.g., various colored transition metal complexes), possibly inducing unwanted photochemistry and sample degradation 39 .…”

mentioning

confidence: 99%

“…Mount the assembled piece on the XY translation stage with a rotating platform using the screw holes at the outer edge. The central part of the rotating platform should be kept free for the APD, which will be mounted later 39…”

mentioning

confidence: 99%

Quantum diamond spectrometer for nanoscale NMR and ESR spectroscopy

et al. 2019

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Nitrogen-vacancy (NV) quantum defects in diamond are sensitive detectors of magnetic fields. Due to their atomic size and optical readout capability, they have been used for magnetic resonance spectroscopy of nanoscale samples on diamond surfaces. Here we present a protocol for fabricating NV-diamond chips and for constructing and operating a simple, low-cost "quantum diamond spectrometer" for performing nuclear magnetic resonance (NMR) and electron spin resonance (ESR) spectroscopy in nanoscale volumes. The instrument is based on a commercially-available diamond chip, with an ion-implanted NVensemble at a depth of ~ 10 nm below the diamond surface. The spectrometer operates at low magnetic fields (~ 300 G) and requires standard optical and microwave components for NV spin preparation, manipulation and readout. We demonstrate the utility of this device for nanoscale proton and fluorine NMR spectroscopy, as well as for the detection of transition metals via ESR noise spectroscopy. We estimate that the full protocol requires 2-3 months to implement, depending on the availability of equipment, diamond substrates, and user experience. Introduction:Magnetic resonance spectroscopy of electrons and nuclei comprises a family of ubiquitous and essential analytical tools in modern chemical and biological research 1 . Electron spin resonance (ESR), also known as electron paramagnetic resonance (EPR), spectroscopy is a useful means for probing molecules possessing unpaired electrons, such as transition metal complexes and radicals 2 . (Bio)molecules that lack an unpaired electronic spin can be probed via ESR-active spin labels. Nuclear magnetic resonance (NMR), on the other hand, is a more widely utilized technique, as NMR-active nuclei (e.g., 1 H, 13 C, 14 N, and 31 P) are commonly encountered in organic and biological chemistry. The narrow spectral lines of NMR afford unprecedented information about molecular structure and dynamics. NMR is less sensitive than ESR, however, owing to the lower gyromagnetic ratios of nuclei compared to that of the electron. In fact, both NMR and ESR are relatively insensitive when compared to the state of the art in other analytical techniques like mass spectrometry or fluorescence microscopy. The low sensitivity of magnetic resonance is particularly challenging for life science applications, where biomolecules of interest commonly occur in small absolute quantities or concentrations. Thus, there is great interest in new techniques to increase the sensitivity of magnetic resonance spectroscopy 3-5 . One promising approach employs a magnetic sensor based on fluorescent quantum defects in diamond, such as nitrogen-vacancy (NV) color centers, enabling interrogation of sample volumes down to the nanoscale 6,7 , including single proteins 8,9 , single protons 10 and 2D materials 11 . In this protocol, we describe the procedure for generating NV-diamond sensor chips and the construction of a "quantum diamond spectrometer" for NMR and ESR of nanoscale samples placed on the diamond chip. Physical back...

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A molecular quantum spin network controlled by a single qubit

Abstract: Control of molecular spins and their readout with a solid-state qubit are described as a unit cell in a quantum spin network.

Cited by 59 publications

References 49 publications

Nanoscale zero-field electron spin resonance spectroscopy

Nanoscale zero-field electron spin resonance spectroscopy

Kilohertz electron paramagnetic resonance spectroscopy of single nitrogen centers at zero magnetic field

Quantum diamond spectrometer for nanoscale NMR and ESR spectroscopy

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