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The Quantum-Mechanical Model of an Atom02:45

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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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An atomic-scale multi-qubit platform.

Yu Wang1,2, Yi Chen1,2,3,4, Hong T Bui1,5

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Researchers built coupled electron-spin qubits atom-by-atom. This quantum technology platform enables coherent operations and readout for future quantum devices.

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Area of Science:

  • Quantum Science and Technology
  • Solid-State Physics
  • Quantum Computing

Background:

  • Individual electron spins in solids are key for quantum technologies.
  • Atomically precise assembly of quantum devices with controlled couplings is a long-standing goal.

Purpose of the Study:

  • To demonstrate atom-by-atom construction of coupled electron-spin qubits.
  • To achieve coherent operations and readout of these qubits.
  • To develop a scalable platform for quantum functionalities.

Main Methods:

  • Utilized a scanning tunneling microscope for atom-by-atom assembly.
  • Employed local magnetic field gradients from single-atom magnets for remote qubit control.
  • Implemented pulsed double electron spin resonance with a sensor qubit for readout.

Main Results:

  • Successfully constructed and demonstrated coherent operations on coupled electron-spin qubits.
  • Achieved fast single-, two-, and three-qubit operations in an all-electrical manner.
  • Established a method for controlling and reading out "remote" qubits.

Conclusions:

  • An angstrom-scale qubit platform based on electron spins has been realized.
  • This platform facilitates bottom-up assembly of quantum devices with atomic precision.
  • Potential for future quantum functionalities using surface-based electron spin arrays.