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Related Experiment Videos

Fan-out Estimation in Spin-based Quantum Computer Scale-up.

Thien Nguyen1, Charles D Hill2, Lloyd C L Hollenberg2

  • 1Research School of Engineering, College of Engineering and Computer Science, The Australian National University, Canberra, ACT 2601, Australia. thien.nguyen@anu.edu.au.

Scientific Reports
|October 19, 2017
PubMed
Summary
This summary is machine-generated.

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Solid-state spin qubits show promise for scaling quantum computers. However, fabricating and controlling large 2D arrays for error correction presents challenges, limiting qubit integration.

Area of Science:

  • Quantum computing hardware
  • Solid-state physics
  • Nanotechnology

Background:

  • Solid-state spin qubits offer long coherence times and leverage existing electronic fabrication technologies for scalability.
  • High-threshold quantum error correction necessitates two-dimensional qubit arrays, which are difficult to fabricate and control.
  • Current architectures often require individual qubit control and readout, limiting scalability.

Purpose of the Study:

  • To analyze the fan-out routing overhead for a dedicated control line architecture in solid-state spin qubits.
  • To estimate the spatial scalability of solid-state spin qubit platforms under current fabrication constraints.
  • To identify strategies for achieving large-scale integration of qubits for universal quantum computation.

Main Methods:

Related Experiment Videos

  • Analysis of fan-out routing overhead for a generalized solid-state spin qubit platform.
  • Parameterization to include both Coulomb-confined (donor-based) and electrostatically confined (quantum dot-based) qubits.
  • Estimation of spatial scalability using standard electronic routing methods and fabrication constraints.

Main Results:

  • The study estimates that 10^2 to 10^5 physical qubits can be integrated and controlled independently, depending on the quantum interconnect.
  • Scalability can be extended by assuming longer control-free interconnects.
  • The fan-out routing overhead is a critical factor in determining the number of integrable qubits.

Conclusions:

  • Achieving large-scale integration of solid-state spin qubits requires overcoming fabrication and control challenges associated with 2D arrays.
  • Higher dimensional electronic fabrication and multiplexed distributed control/readout schemes are likely necessary for large-scale quantum computation.
  • The fan-out routing overhead analysis provides insights into the practical limits of current architectures.