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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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Quantum enhanced radio detection and ranging with solid spins.

Xiang-Dong Chen1,2,3, En-Hui Wang1,2, Long-Kun Shan1,2

  • 1CAS Key Laboratory of Quantum Information, School of Physical Sciences, University of Science and Technology of China, Hefei, 230026, P. R. China.

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|March 9, 2023
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Summary
This summary is machine-generated.

Quantum sensing enhances radio frequency (RF) detection and ranging. This novel approach improves RF magnetic sensitivity by three orders and achieves a 16 μm ranging accuracy using solid spins for applications like autonomous driving.

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Area of Science:

  • Quantum sensing
  • Radio frequency (RF) technology
  • Solid-state physics

Background:

  • Accurate radio frequency (RF) ranging and localization are crucial for autonomous driving, IoT, and manufacturing.
  • Quantum receivers offer potential advantages over conventional methods for radio signal detection.
  • Solid-state spins are promising quantum sensors due to robustness, high spatial resolution, and miniaturization, but face challenges with high-frequency RF response.

Purpose of the Study:

  • To demonstrate quantum-enhanced radio detection and ranging by exploiting coherent interactions between quantum sensors and RF fields.
  • To improve the RF magnetic sensitivity and ranging accuracy of solid-state spin-based sensors.
  • To explore the potential of quantum-enhanced radar and communications using solid spins.

Main Methods:

  • Utilizing nanoscale quantum sensing with RF focusing to enhance detection.
  • Exploiting coherent interaction between quantum sensors and RF fields.
  • Employing multi-photon excitation to improve spin response to target position.

Main Results:

  • Achieved a three-order improvement in RF magnetic sensitivity, reaching 21 [Formula: see text].
  • Realized a ranging accuracy of 16 μm with a GHz RF signal.
  • Demonstrated enhanced response of spins to target position through multi-photon excitation.

Conclusions:

  • Quantum-enhanced radio detection and ranging using solid spins is feasible and offers significant performance improvements.
  • The developed techniques enhance RF magnetic sensitivity and ranging accuracy, paving the way for quantum radar and communication systems.
  • Solid-state spin quantum sensing presents a promising platform for advanced RF applications.