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Related Concept Videos

Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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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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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

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All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
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Atomic Nuclei: Nuclear Spin State Overview01:03

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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: Overview01:12

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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.
Spin decoupling is usually achieved by...
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Nuclear Magnetic Resonance (NMR): Overview01:07

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Nuclear magnetic resonance (NMR) is a phenomenon exhibited by certain nuclei that can absorb characteristic radio frequency radiation under certain conditions. NMR has been extensively applied in molecular spectroscopy and medical diagnostic imaging. In both these applications, the molecule or subject under study is placed in a magnetic field and irradiated with radio frequency energy.
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Nuclear Magnetic Resonance with a Levitating Microparticle.

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  • 1<a href="https://ror.org/03a26mh11">Laboratoire De Physique de l'École Normale Supérieure</a>, <a href="https://ror.org/05a0dhs15">École Normale Supérieure</a>, PSL Research University, CNRS, <a href="https://ror.org/02en5vm52">Sorbonne Université</a>, <a href="https://ror.org/05f82e368">Université Paris Cité</a>, 24 rue Lhomond, 75231 Paris Cedex 05, France.

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Researchers achieved nuclear magnetic resonance (NMR) in a levitated microdiamond, demonstrating unprecedented spin coherence times. This breakthrough in quantum science opens doors for advanced cooling and gyroscopy applications.

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Area of Science:

  • Quantum Science
  • Condensed Matter Physics
  • Atomic, Molecular, and Optical Physics

Background:

  • Nuclear magnetic resonance (NMR) is a versatile technique with applications across multiple scientific disciplines.
  • Conventional NMR typically operates on stationary samples, limiting exploration of novel physical regimes.
  • Levitation techniques offer new platforms for studying quantum phenomena in isolated systems.

Purpose of the Study:

  • To demonstrate nuclear magnetic resonance (NMR) within a levitated microdiamond.
  • To achieve and measure long spin coherence times in a macroscopic levitated object.
  • To explore potential applications of levitated NMR in quantum technologies.

Main Methods:

  • Utilizing a levitated microdiamond confined in a Paul trap.
  • Employing optically polarized nitrogen-vacancy (NV) centers for hyperfine interaction.
  • Leveraging ^{14}N nuclear spins for NMR signal generation and readout.
  • Achieving tight confinement of angular degrees of freedom.

Main Results:

  • Successfully observed NMR signals from ^{14}N nuclear spins in a levitated microdiamond.
  • Achieved nuclear spin polarization and quantum state readout via NV centers.
  • Recorded spin coherence times up to hundreds of microseconds.
  • Established a new record for spin coherence time in a levitated system, exceeding previous records by three orders of magnitude.

Conclusions:

  • Levitated microdiamond NMR is feasible and offers extended coherence times.
  • This work paves the way for ground-state cooling of macroscopic objects.
  • Potential applications include development of highly sensitive quantum gyroscopes utilizing geometric phases.