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Submicrosecond entangling gate between trapped ions via Rydberg interaction.

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Researchers developed a new quantum entanglement method using Rydberg ions, achieving a 700-nanosecond gate time. This breakthrough significantly speeds up quantum computation and simulation for large systems.

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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Quantum Computing

Background:

  • Trapped ions offer precise control for quantum entanglement but are limited by slow gate speeds.
  • Fast entanglement gates are crucial for scaling quantum computers beyond classical limits.
  • Rydberg atoms and polar molecules enable faster gates but lack stable confinement.

Purpose of the Study:

  • To develop a faster quantum entanglement gate for large ion crystals.
  • To combine the benefits of trapped ions and strong dipole-dipole interactions.
  • To significantly accelerate trapped-ion quantum computers and simulators.

Main Methods:

  • Implemented a two-ion entangling gate utilizing the strong dipolar interaction between trapped Rydberg ions.
  • Achieved a gate time of 700 nanoseconds.
  • Analyzed sources of gate error and predicted performance in larger systems.

Main Results:

  • Successfully produced a Bell state with 78% fidelity using the new gate.
  • Identified gate error sources and predicted a total error below 0.2% for achievable parameters.
  • Predicted a gate error of approximately 10^-4 in a 100-ion crystal, with minimal motional mode coupling.

Conclusions:

  • The novel Rydberg ion gate offers a substantial speedup for trapped-ion quantum computation.
  • This method addresses the challenge of fast entanglement in large ion crystals.
  • The approach promises to significantly enhance the scalability and performance of quantum computers and simulators.