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Related Concept Videos

The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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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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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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Circuit quantum electrodynamics with a spin qubit.

K D Petersson1, L W McFaul, M D Schroer

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Researchers integrated circuit quantum electrodynamics (cQED) with indium arsenide spin qubits. This enables long-range qubit interactions crucial for scalable quantum computing and probing spin dynamics.

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Area of Science:

  • Quantum Computing
  • Condensed Matter Physics
  • Quantum Information Science

Background:

  • Electron spins in quantum dots are promising for quantum processors.
  • Scalable quantum computing requires long-range qubit interactions beyond nearest-neighbor coupling.
  • Circuit quantum electrodynamics (cQED) facilitates interactions between distant qubits via a superconducting cavity.

Purpose of the Study:

  • To combine cQED architecture with spin qubits for scalable quantum computing.
  • To investigate long-range interactions between spin qubits using a superconducting cavity.
  • To demonstrate the use of cQED as a probe for single-spin physics.

Main Methods:

  • Coupling an indium arsenide nanowire double quantum dot to a superconducting microwave cavity.
  • Utilizing the strong spin-orbit interaction in indium arsenide for electrical spin rotation.
  • Employing charge-cavity interaction for measuring spin dynamics.

Main Results:

  • Achieved a charge-cavity coupling rate of approximately 30 MHz.
  • Demonstrated electrical control of spin rotations using a local gate electrode.
  • Showcased a feasible spin-cavity coupling rate of about 1 MHz.

Conclusions:

  • The cQED architecture can be effectively adapted for spin qubits.
  • This approach enables sensitive probing of single-spin physics.
  • The demonstrated spin-cavity coupling paves the way for long-range spin interactions in quantum processors.