Enhancing quantum sensing sensitivity by a quantum memory

Zaiser, Sebastian; Rendler, Torsten; Jakobi, Ingmar; Wolf, Thomas; Lee, Sang-Yun; Wagner, Samuel; Bergholm, Ville; Schulte‐Herbrüggen, Thomas; Neumann, Philipp; Wrachtrup, Jörg

doi:10.1038/ncomms12279

Cited by 148 publications

(173 citation statements)

References 45 publications

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“…This immediately warrants the use of different schemes to increase both the coherence time, by adapting, for example, quantum error correction protocols [61], quantum Fourier transform and quantum memory for storing the state of the electron spin ( [45,62,63] and also to go beyond the limitation of the NV's T 1 relaxation time and achieve, as a result, record spectral resolution.…”

Section: High Resolution Nmr and Qipmentioning

confidence: 99%

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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Section: High Resolution Nmr and Qipmentioning

confidence: 99%

Single spin magnetic resonance

Wrachtrup

Finkler

2016

Journal of Magnetic Resonance

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“…Quantum network needs spin-photon entanglement interfaces, where also ancilla qubits are needed. SiC ancilla qubits can be realized by exploiting electron and nuclear spins coupling [169,170], e.g. in 29 Si which shows a hyperfine interaction of up to ∼10 MHz for both V Si and DV, or in 13 C. 29 Si nuclear spins can show extended excited-state electron-nuclear interaction time which can be exploited to reach near-unity polarization in the DV neutral charge state [171].…”

Section: Spin-photon Entanglement Interfaces For Quantum Metrology Anmentioning

confidence: 99%

Silicon carbide color centers for quantum applications

2020

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Silicon carbide has recently surged as an alternative material for scalable and integrated quantum photonics, as it is a host for naturally occurring color centers within its bandgap, emitting from the UV to the IR even at telecom wavelength. Some of these color centers have been proved to be characterized by quantum properties associated with their single-photon emission and their coherent spin state control, which make them ideal for quantum technology, such as quantum communication, computation, quantum sensing, metrology and can constitute the elements of future quantum networks. Due to its outstanding electrical, mechanical, and optical properties which extend to optical nonlinear properties, silicon carbide can also supply a more amenable platform for photonics devices with respect to other wide bandgap semiconductors, being already an unsurpassed material for high power microelectronics. In this review, we will summarize the current findings on this material color centers quantum properties such as quantum emission via optical and electrical excitation, optical spin polarization and coherent spin control and manipulation. Their fabrication methods are also summarized, showing the need for on-demand and nanometric control of the color centers fabrication location in the material. Their current applications in single-photon sources, quantum sensing of strain, magnetic and electric fields, spin-photon interface are also described. Finally, the efforts in the integration of these color centers in photonics devices and their fabrication challenges are described.proved to host these types of color centers, we can now determine that the material has approached the quality needed for quantum applications development.The first bulk material studied for applications in quantum technology is diamond. It was possible to isolate single color centers and determine their role for application in quantum technologies. As an example, the nitrogen-vacancy (NV) center [10], hosted by the diamond matrix, has become the leading color center in applications such as quantum sensing [11], which is a more achievable application on the road map towards quantum networks. Further, other color centers such as the Germanium vacancy (GeV) [12] and the siliconvacancy (SiV) [13] in diamond proved to have an enormous potential for quantum optical spin-photon interface due to their narrow bandwidth emission [14]. The wide bandgap of the diamond, together with its weak spinorbit coupling and diluted nuclear-spin bath, gives to diamond color centers a remarkable spin coherence, and isotope engineering can enhance it further, due to the possibility of growing highly pure samples [15]. SiC also enjoys most of these properties, and benefits from mature production protocols on a large scale which are available for silicon, excellent nanofabrication quality [16], and capability of ion implantation without the side effects typical of the diamond, such as graphitization during irradiation [17]. However, diamond has some limitations in this respect in...

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“…31 In recent experiments with spin qubits in diamond, auxiliary nuclear spins have been used to increase the effective coherence time of an electronic sensor spin by quantum error correction, 32 quantum feedback, 33,34 or by exploiting double-quantum coherence. 35 Moreover, ancillary nuclei have been used to enhance the readout efficiency. 23,24 In our study we utilize the auxiliary nuclear spin as a long-lived memory for the electron qubit's state.…”

Section: Introductionmentioning

confidence: 99%

A quantum spectrum analyzer enhanced by a nuclear spin memory

et al. 2017

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We realize a two-qubit sensor designed for achieving high-spectral resolution in quantum sensing experiments. Our sensor consists of an active "sensing qubit" and a long-lived "memory qubit", implemented by the electronic and the nitrogen-15 nuclear spins of a nitrogen-vacancy center in diamond, respectively. Using state storage times of up to 45 ms, we demonstrate spectroscopy of external ac signals with a line width of 19 Hz (∼2.9 ppm) and of carbon-13 nuclear magnetic resonance signals with a line width of 190 Hz (∼74 ppm). This represents an up to 100-fold improvement in spectral resolution compared to measurements without nuclear memory.

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Enhancing quantum sensing sensitivity by a quantum memory

Cited by 148 publications

References 45 publications

Single spin magnetic resonance

Single spin magnetic resonance

Silicon carbide color centers for quantum applications

A quantum spectrum analyzer enhanced by a nuclear spin memory

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