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A trapped-ion-based quantum byte with 10(-5) next-neighbour cross-talk.

C Piltz1, T Sriarunothai1, A F Varón1

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Researchers achieved individual qubit addressing in a quantum byte, minimizing cross-talk errors. This breakthrough is crucial for scalable quantum computing and fault-tolerant protocols.

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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Quantum Computing Hardware

Background:

  • Scalable quantum computing requires precise control over individual qubits within a quantum register.
  • Executing single-qubit gates can induce unwanted errors (cross-talk) in other qubits, hindering fidelity and scalability.
  • Quantum error correction protocols are essential for fault-tolerant quantum computing but are sensitive to cross-talk levels.

Purpose of the Study:

  • To demonstrate individual qubit addressing within a quantum byte (eight qubits).
  • To quantify the cross-talk error induced in non-addressed qubits during single-qubit gate operations.
  • To assess if the measured cross-talk is below the threshold for efficient fault-tolerant quantum computing.

Main Methods:

  • Implementation of a quantum byte using microwave-driven hyperfine qubits of ytterbium-171 ions.
  • Confinement of ions in a Paul trap enhanced with a magnetic gradient field for qubit manipulation.
  • Measurement of cross-talk errors on non-addressed qubits following single-qubit gate applications.

Main Results:

  • Successful demonstration of addressing individual qubits within an eight-qubit quantum register.
  • Quantified cross-talk errors to be on the order of 10^-5.
  • Achieved cross-talk levels significantly below the established threshold for fault-tolerant quantum computing.

Conclusions:

  • The developed method overcomes the scalability limitations imposed by cross-talk errors in quantum registers.
  • The results pave the way for building more robust and scalable quantum computers.
  • This work contributes to the practical realization of fault-tolerant quantum computation through precise qubit control.