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Integrated optical multi-ion quantum logic.

Karan K Mehta1, Chi Zhang2, Maciej Malinowski2

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Researchers developed scalable, integrated optics for trapped-ion qubits, achieving high-fidelity quantum logic gates. This advancement enhances robustness and offers a path toward practical, large-scale quantum information processing.

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Area of Science:

  • Quantum Information Science
  • Atomic, Molecular, and Optical Physics

Background:

  • Quantum information processing demands improved error rates and scalability in current systems.
  • Trapped-ion qubits offer long-term potential, but optical control complexity hinders scaling.
  • Integrated optics in ion traps can enhance system robustness and parallelization.

Purpose of the Study:

  • To demonstrate scalable optics co-fabricated with a surface-electrode ion trap for high-fidelity multi-ion quantum logic gates.
  • To overcome the limitations of complex optical setups in current trapped-ion systems.
  • To enable practical parallelization for high-fidelity quantum processors.

Main Methods:

  • Co-fabrication of scalable optics with a surface-electrode ion trap.
  • Direct fiber coupling of light to a cryogenic trap chip via multiple channels.
  • Implementation of ground-state laser cooling and two-ion entangled state gates.

Main Results:

  • Achieved fidelities greater than 99.3(2) percent for two-ion entangled states.
  • Demonstrated efficient light delivery, eliminating the need for complex beam alignment.
  • Developed hardware that reduces noise and drifts in quantum logic operations.

Conclusions:

  • Scalable, integrated optics provide a robust route to high-fidelity trapped-ion quantum logic.
  • This approach facilitates practical parallelization for advanced quantum processors.
  • Potential applications extend to quantum sensing and timekeeping.