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Related Concept Videos

Quantum Numbers02:43

Quantum Numbers

It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.

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Targeted enrichment of 28Si thin films for quantum computing.

K Tang1,2, H S Kim2,3, A N Ramanayaka2

  • 1Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20740, United States of America.

Journal of Physics Communications
|October 12, 2020
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Summary

Researchers precisely controlled silicon-28 (²⁸Si) film enrichment for quantum computing. This method achieved ultra-high purity levels, crucial for minimizing quantum decoherence in advanced semiconductor applications.

Keywords:
isotope enrichmentmolecular beam epitaxyquantum informationsemiconductor materialsthin films

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Area of Science:

  • Materials Science
  • Quantum Computing
  • Semiconductor Physics

Background:

  • Isotopically enriched silicon-28 (²⁸Si) is a promising host for quantum computing due to its nuclear spin-free nature.
  • Understanding quantum decoherence mechanisms and required enrichment levels in ²⁸Si is critical for advancing quantum technologies.
  • Precise control over isotopic composition is essential for fabricating high-performance quantum devices.

Purpose of the Study:

  • To report on the growth of isotopically enriched ²⁸Si epitaxial films with precisely controlled enrichment levels.
  • To investigate the feasibility of achieving ultra-high purity ²⁸Si for quantum computing applications.
  • To develop and validate a predictive model for residual silicon-29 (²⁹Si) concentration.

Main Methods:

  • Epitaxial growth of ²⁸Si films using hyperthermal energy ion beam deposition with silane gas.
  • Mass-selective magnetic field switching to precisely control ²⁹Si concentration during deposition.
  • Development of a predictive model correlating deposition parameters with residual ²⁹Si fraction.
  • Secondary Ion Mass Spectrometry (SIMS) for accurate measurement of ²⁹Si concentration in deposited films.

Main Results:

  • Successfully grew ²⁸Si epitaxial films with enrichment levels ranging from natural abundance to 99.99987% purity.
  • Achieved precise control over ²⁹Si concentration, a key factor for quantum decoherence mitigation.
  • The developed predictive model showed excellent agreement with SIMS measurements, with an average deviation of only 10%.

Conclusions:

  • The ion beam deposition technique allows for highly controlled isotopic enrichment of ²⁸Si films.
  • This method provides a pathway to produce the ultra-pure ²⁸Si required for advanced quantum computing.
  • The validated predictive model facilitates the optimization of deposition parameters for desired isotopic compositions.