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Related Concept Videos

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...
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Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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Scalable Atomic Arrays for Spin-Based Quantum Computers in Silicon.

Alexander M Jakob1,2, Simon G Robson1,2, Hannes R Firgau2,3

  • 1School of Physics, University of Melbourne, Parkville, VIC, 3010, Australia.

Advanced Materials (Deerfield Beach, Fla.)
|August 29, 2024
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Summary
This summary is machine-generated.

Manufacturing scalable quantum computers using silicon is advanced by new donor spin qubit strategies. These methods improve implant precision and enable dense, regular arrays for quantum information processing.

Keywords:
deterministic single ion implantationdonor spin qubits and quditselectronic device engineeringscalable atomic arrayssilicon quantum computing

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Area of Science:

  • Quantum computing
  • Semiconductor physics
  • Materials science

Background:

  • Semiconductor spin qubits offer high quantum performance and manufacturability using established metal-oxide-semiconductor (MOS) processes.
  • Ion-implanted donor spins provide long coherence times and large Hilbert space dimensions for quantum information processing.

Purpose of the Study:

  • To demonstrate and integrate strategies for manufacturing scalable donor-based quantum computers in silicon.
  • To enhance precision and control in donor spin qubit placement and arrangement.

Main Methods:

  • Utilizing 31PF2 molecule implants to improve placement certainty and detection confidence.
  • Employing heavier atoms like 123Sb and 209Bi for high-dimensional qudits and Sb2 molecules for deterministic qudit formation.
  • Implementing step-and-repeat implantation through a nano-aperture for deterministic formation of regular donor atom arrays with 300 nm spacing.

Main Results:

  • Achieved 99.99% confidence in implant detection using 31PF2 molecule implants, tripling placement certainty over 31P ions.
  • Demonstrated the use of 123Sb and 209Bi as high-dimensional qudits and Sb2 molecules for closely-spaced qudit formation.
  • Successfully created regular arrays of donor atoms with 300 nm spacing using nano-aperture implantation.

Conclusions:

  • The developed strategies address key technological requirements for constructing silicon-based quantum computers.
  • These advancements pave the way for scalable quantum computing using precisely controlled donor spin qubits.