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Crosstalk Suppression in Individually Addressed Two-Qubit Gates in a Trapped-Ion Quantum Computer.

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Quantum computing crosstalk errors limiting gate fidelity are reduced using single-qubit echoing pulses. This novel scheme actively cancels coherent crosstalk in trapped-ion systems, improving two-qubit gate fidelity.

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Area of Science:

  • Quantum Computing
  • Atomic Physics
  • Quantum Information Science

Background:

  • Crosstalk between qubits is a significant error source in quantum computers.
  • Spillover of control signals degrades the fidelity of two-qubit entangling gates.

Purpose of the Study:

  • To model and actively suppress coherent crosstalk errors in laser-driven trapped-ion systems.
  • To demonstrate a novel crosstalk suppression scheme using local qubit control.

Main Methods:

  • Modeled coherent crosstalk as a residual Xσ[over ^]_{ϕ} interaction.
  • Implemented single-qubit echoing pulses for active error cancellation.
  • Applied echoing pulses locally to target qubits.

Main Results:

  • Achieved a two-qubit Bell state fidelity of 99.52(6)% with post-gate echoing.
  • Obtained a fidelity of 99.37(5)% with echoing applied to each gate.
  • Demonstrated a scheme requiring only local control, unlike prior methods.

Conclusions:

  • Coherent crosstalk in trapped-ion systems can be effectively canceled by single-qubit echoing pulses.
  • The proposed local control scheme significantly enhances two-qubit gate fidelity.
  • This technique is broadly applicable to other quantum computing platforms.