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Related Concept Videos

NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

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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: 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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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.
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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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Phase estimation algorithms for quantum enhanced magnetometry with artificial atoms.

Vladimir Slepnev1, Azat Gubaydullin2, Valerii Vinokur3

  • 1Terra Quantum AG, Kornhausstrasse 25, St. Gallen, 9000, Switzerland.

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|December 11, 2025
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Summary
This summary is machine-generated.

We developed a quantum approach to magnetometry using phase estimation algorithms. This method improves magnetic flux detection precision and dynamical range for superconducting qubits.

Keywords:
Phase estimation algorithmsQuantum magnetometryQubitsSensing

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Area of Science:

  • Quantum sensing
  • Superconducting quantum devices
  • Metrology

Background:

  • Conventional magnetometry faces limitations in precision and dynamical range.
  • Quantum metrology offers potential for enhanced measurement capabilities.

Purpose of the Study:

  • To develop a quantum approach for magnetometry utilizing phase estimation algorithms.
  • To improve the precision and dynamical range of magnetic flux estimation.
  • To enhance the performance of superconducting qubits for quantum sensing.

Main Methods:

  • Utilized phase estimation algorithms for quantum magnetometry.
  • Proposed modifications to conventional algorithms: signal modulation and proximity time measurements.
  • Integrated adaptive algorithms with device-specific calibration.

Main Results:

  • Demonstrated improvements in both precision and dynamical range for magnetic flux estimation.
  • Showcased enhanced performance of superconducting qubits, enabling higher information gain.
  • Achieved higher information gain without compromising the dynamical range.

Conclusions:

  • The developed quantum approach significantly enhances magnetic flux detection.
  • This method paves the way for achieving the Heisenberg limit in quantum sensing.
  • The framework bridges theoretical advancements and practical applications in quantum metrology using superconducting qubits.