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Individual-Ion Addressing and Readout in a Penning Trap.

Brian J McMahon1, Kenton R Brown1, Creston D Herold1

  • 1<a href="https://ror.org/04qfrh333">Georgia Tech Research Institute</a>, Atlanta, Georgia 30332, USA.

Physical Review Letters
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Summary
This summary is machine-generated.

We demonstrate individual ion addressing and readout in a rotating crystal trap for quantum simulation. This technique enables precise control of qubits encoded in calcium ions, paving the way for advanced quantum computing applications.

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Area of Science:

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

Background:

  • Trapped ions are a leading platform for quantum computing and simulation.
  • Individual addressing and readout are crucial for scalable quantum operations.
  • Previous methods faced challenges in scalability and precision.

Purpose of the Study:

  • To implement individual addressing and readout of ions in a rotating planar crystal.
  • To demonstrate qubit operations using a metastable manifold and focused laser beams.
  • To assess the fidelity of addressing operations and identify limitations.

Main Methods:

  • Utilizing a compact Penning trap with a rotating triangular potential to stabilize a ^{40}Ca^{+} crystal.
  • Implementing parallel readout in the rotating frame via detected ion fluorescence.
  • Encoding qubits in the metastable D_{5/2} manifold for near-infrared laser operations.
  • Employing a focused ac Stark shifting laser for addressed σ_{z} operations.

Main Results:

  • Successfully demonstrated individual ion addressing and readout across the crystal.
  • Achieved addressed σ_{z} operations on ions at various radial positions.
  • Simulations indicate current addressing fidelity of ~97%, limited by thermal effects.
  • Identified potential for fidelity improvement to <10^{-3} with sub-Doppler cooling.

Conclusions:

  • The demonstrated techniques provide a complete set of operations for quantum simulation on this platform.
  • This work advances the development of scalable and high-fidelity trapped-ion quantum processors.
  • The compact design and demonstrated control are promising for future quantum technologies.