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Related Concept Videos

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.
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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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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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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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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.
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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Coherent operations and screening in multielectron spin qubits.

A P Higginbotham1, F Kuemmeth2, M P Hanson3

  • 1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA and Center for Quantum Devices, Niels Bohr Institute, 2100 Copenhagen, Denmark.

Physical Review Letters
|February 4, 2014
PubMed
Summary
This summary is machine-generated.

Multielectron spin qubits show faster quantum exchange oscillations (>1 GHz) and higher quality factors (Q~15) than single-electron qubits (Q~2). A dephasing model explains observed performance in quantum dots.

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Area of Science:

  • Quantum Computing
  • Condensed Matter Physics
  • Spin Qubits

Background:

  • Quantum dots are fundamental building blocks for quantum computing.
  • Controlling electron spins in quantum dots is crucial for qubit performance.
  • Understanding dephasing mechanisms is key to improving qubit coherence.

Purpose of the Study:

  • To demonstrate and characterize multielectron spin qubits.
  • To compare the performance of multielectron versus single-electron spin qubits.
  • To develop and validate a dephasing model for quantum dot qubits.

Main Methods:

  • Fabrication and measurement of coupled single- and multielectron quantum dots in the same device.
  • Measurement of coherent exchange oscillations to assess qubit performance.
  • Development of a theoretical model incorporating voltage and hyperfine noise for dephasing analysis.

Main Results:

  • Achieved fast (>1 GHz) exchange oscillations in multielectron spin qubits.
  • Observed significantly higher quality factors (Q~15) for multielectron qubits compared to single-electron qubits (Q~2).
  • Developed a dephasing model showing good agreement with experimental data for both qubit types.

Conclusions:

  • Multielectron spin qubits offer superior performance in terms of exchange oscillation speed and quality factor.
  • The developed dephasing model provides insights into noise sources affecting quantum dot qubits.
  • Further investigation into exchange-independent dephasing is necessary for quantitative agreement across all parameters.