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Related Concept Videos

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Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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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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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
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A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
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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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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Charge-Insensitive Single-Atom Spin-Orbit Qubit in Silicon.

Joe Salfi1,2, Jan A Mol1,2, Dimitrie Culcer1

  • 1School of Physics, The University of New South Wales, Sydney, New South Wales 2052, Australia.

Physical Review Letters
|July 2, 2016
PubMed
Summary
This summary is machine-generated.

We introduce a novel silicon spin-orbit qubit for robust quantum entanglement. This qubit leverages spin-orbit coupling (SOC) for long-range connections while remaining protected from electrical noise, advancing quantum computing hardware.

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Area of Science:

  • Quantum Computing
  • Solid-State Physics
  • Materials Science

Background:

  • Achieving high-fidelity entanglement in on-chip spin qubit arrays is a significant challenge.
  • Spin-orbit coupling (SOC) offers potential for long-range entanglement but introduces electrical noise sensitivity.
  • Existing quantum computing platforms face decoherence issues impacting qubit stability.

Purpose of the Study:

  • To propose a new type of qubit that overcomes the limitations of conventional spin qubits.
  • To enable robust, long-range entanglement in silicon-based quantum processors.
  • To achieve a noise-protected qubit compatible with scalable quantum computing architectures.

Main Methods:

  • Development of an acceptor-based spin-orbit qubit utilizing quadrupolar SOC.
  • Leveraging silicon as an industrially relevant platform for qubit fabrication.
  • Theoretical modeling of qubit performance, including gate fidelities and spin lifetime.

Main Results:

  • The proposed qubit operates at a sweet spot, offering protection against electrical noise.
  • Predicted gate fidelities: 10^5 electrically mediated single-qubit gates and 10^4 dipole-dipole mediated two-qubit gates within the spin lifetime.
  • Feasibility of circuit quantum electrodynamics, including dispersive readout and cavity/spin-photon entanglement.

Conclusions:

  • The acceptor-based spin-orbit qubit in silicon provides a promising pathway for scalable quantum entanglement.
  • The qubit's noise resilience and high gate counts are suitable for surface code implementation.
  • Integration with circuit quantum electrodynamics opens avenues for advanced quantum information processing.