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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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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 one, the...
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Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
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Dissipatively Stabilized Quantum Sensor Based on Indirect Nuclear-Nuclear Interactions.

Q Chen1, I Schwarz1, M B Plenio1

  • 1Institut für Theoretische Physik & IQST, Albert-Einstein-Allee 11, Universität Ulm, 89069 Ulm, Germany.

Physical Review Letters
|July 22, 2017
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Summary
This summary is machine-generated.

We developed a quantum gate for nuclear spins using a nitrogen vacancy (NV) center, enabling high-fidelity interactions even at large distances. This method enhances quantum sensing by protecting nuclear spins from decoherence.

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Area of Science:

  • Quantum Information Science
  • Quantum Sensing
  • Solid-State Quantum Systems

Background:

  • Nitrogen vacancy (NV) centers in diamond are promising for quantum applications.
  • Protecting nuclear spins from decoherence is crucial for quantum computing and sensing.
  • Mediating interactions between distant nuclear spins remains a challenge.

Purpose of the Study:

  • To propose a novel quantum gate scheme for nuclear spins using a dissipatively stabilized NV center.
  • To achieve high-fidelity quantum gates between nuclear spins, even at large distances.
  • To enable nuclear spins to function as sensors with enhanced signal-to-noise ratios.

Main Methods:

  • Utilizing a dissipatively stabilized nitrogen vacancy (NV) center as an interaction mediator.
  • Implementing periodical resets of the NV center to protect nuclear spins from decoherence and relaxation.
  • Leveraging the NV spin as an ancillary system for initialization and readout.

Main Results:

  • Achieved highly selective, high-fidelity quantum gates between nuclear spins under ambient conditions.
  • Demonstrated the scheme's effectiveness even at large NV-nuclear spin distances.
  • Developed a tunable sharp frequency filter immune to NV center decoherence and relaxation.

Conclusions:

  • The proposed method enables robust quantum gates for nuclear spins, overcoming decoherence challenges.
  • This approach facilitates the use of nuclear spins as sensitive quantum sensors.
  • The scheme offers continuous signal collection for high spectral selectivity and signal-to-noise ratios.