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Related Concept Videos

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

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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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Spin–Spin Coupling: One-Bond Coupling01:17

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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,...
1.4K
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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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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Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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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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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Virtual-photon-mediated spin-qubit-transmon coupling.

A J Landig1, J V Koski2, P Scarlino2

  • 1Department of Physics, ETH Zürich, CH-8093, Zürich, Switzerland. alandig@phys.ethz.ch.

Nature Communications
|November 8, 2019
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Summary
This summary is machine-generated.

Researchers created a coherent link between spin qubits and superconducting qubits using a tunable resonator. This breakthrough enables a hybrid quantum computer architecture by coupling different qubit types on a single chip.

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Area of Science:

  • Quantum computing
  • Solid-state physics
  • Quantum information science

Background:

  • Spin qubits and superconducting qubits are leading candidates for solid-state quantum computers.
  • A hybrid architecture requires a coherent link to couple disparate qubit types over significant distances.
  • Existing methods face challenges in integrating and controlling these different qubit modalities.

Purpose of the Study:

  • To establish a coherent, long-range coupling mechanism between spin qubits and superconducting qubits.
  • To demonstrate the feasibility of a hybrid quantum computing architecture on a single chip.
  • To overcome the physical size limitations of spin qubits for integration with superconducting circuits.

Main Methods:

  • Implementation of a frequency-tunable, high-impedance SQUID array resonator to mediate qubit interaction.
  • Utilizing a resonant exchange qubit in a GaAs triple quantum dot, operable at zero magnetic field.
  • Spectroscopic observation of coherent interactions in both resonant and dispersive regimes.

Main Results:

  • Successful realization of a coherent link between a resonant exchange spin qubit and a transmon qubit.
  • Demonstration of qubit coupling mediated by real or virtual photons within the resonator.
  • Operation of the spin qubit at zero magnetic field, facilitating co-integration with superconducting qubits.

Conclusions:

  • A tunable SQUID array resonator effectively mediates coherent interactions between spin and superconducting qubits.
  • This work paves the way for hybrid quantum computing architectures combining the strengths of both qubit types.
  • The developed coupling mechanism is scalable and compatible with existing superconducting quantum computing platforms.