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Related Concept Videos

Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
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Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
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NMR Spectroscopy: Spin–Spin Coupling01:08

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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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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
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Social Exchange Theory02:06

Social Exchange Theory

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We have discussed why we form relationships, what attracts us to others, and different types of love. But what determines whether we are satisfied with and stay in a relationship? One theory that provides an explanation is social exchange theory. According to social exchange theory, we act as naïve economists in keeping a tally of the ratio of costs and benefits of forming and maintaining a relationship with others (Rusbult & Van Lange, 2003).
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Differential Imaging of Biological Structures with Doubly-resonant Coherent Anti-stokes Raman Scattering CARS
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Coherent spin-photon coupling using a resonant exchange qubit.

A J Landig1, J V Koski2, P Scarlino2

  • 1Department of Physics, ETH Zürich, Zurich, Switzerland. alandig@phys.ethz.ch.

Nature
|July 27, 2018
PubMed
Summary
This summary is machine-generated.

Researchers achieved strong coupling between single microwave photons and a three-electron spin qubit. This breakthrough advances quantum information processing by enabling coherent long-distance coupling of spin qubits for quantum computation.

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Area of Science:

  • Quantum Information Science
  • Solid-State Physics
  • Quantum Computing

Background:

  • Electron spins are promising for quantum computation due to long coherence times.
  • Coherent coupling of distant spins is essential for scalable quantum information processing.
  • Photons can serve as carriers for quantum information, enabling remote spin interactions.

Purpose of the Study:

  • To demonstrate strong coupling between single microwave photons and a three-electron spin qubit.
  • To investigate the qubit-photon coupling strength and qubit decoherence rates.
  • To explore electrostatic tuning of qubit decoherence and its dependence on the qubit's electric dipole moment.

Main Methods:

  • Utilizing a niobium titanium nitride high-impedance resonator and a gallium arsenide device with three quantum dots.
  • Observing vacuum Rabi mode splitting as evidence of strong coupling.
  • Employing the AC Stark effect to measure qubit-photon coupling strength dependence.

Main Results:

  • Achieved strong coupling between single microwave photons and a three-electron spin qubit.
  • Observed a coherent coupling strength of approximately 31 MHz and a qubit decoherence rate of about 20 MHz.
  • Demonstrated electrostatic tuning of decoherence to a minimal rate of ~10 MHz for a coupling strength of ~23 MHz.

Conclusions:

  • The demonstration of strong qubit-photon coupling is a significant advancement for coherent long-distance spin qubit coupling.
  • This work paves the way for scalable quantum networks and distributed quantum computation using spin qubits.
  • The ability to tune coupling and decoherence electrostatically offers precise control over quantum systems.