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Researchers developed a novel quantum gate for hybrid ion systems, enabling advanced quantum information processing and networking. This mixed-element gate is crucial for building robust quantum technologies and demonstrating quantum correlations.

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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Quantum Computing

Background:

  • Hybrid quantum systems offer enhanced control by integrating diverse quantum elements.
  • Trapped ions of different elements have been explored for tasks like sympathetic cooling and entanglement generation.
  • Previous mixed-element ion experiments laid groundwork for advanced quantum control.

Purpose of the Study:

  • To demonstrate a novel entangling quantum gate between ions of different elements.
  • To establish a key building block for quantum information processing (QIP) and quantum networking.
  • To explore applications in precision spectroscopy, metrology, and quantum simulation.

Main Methods:

  • Realization of a geometric phase gate between Beryllium-9 and Magnesium-25 ions.
  • Generation of an effective spin-spin interaction using state-dependent forces induced by laser beams.
  • Implementation of single-qubit gates and same-species entangling gates for universal QIP.

Main Results:

  • Demonstration of a mixed-element entangling gate, a complete set for universal QIP in hybrid systems.
  • Successful implementation of CNOT (controlled-NOT) and SWAP gates using the new gate.
  • Robustness of the gates against thermal excitation and improved detection in quantum logic spectroscopy.
  • Observation of strong violation of a CHSH (Clauser-Horne-Shimony-Holt)-type Bell inequality using different ion species.

Conclusions:

  • The developed mixed-element entangling gate is a significant advancement for hybrid quantum systems.
  • This gate facilitates universal quantum information processing and networking with different ion species.
  • The findings pave the way for enhanced quantum simulations, metrology, and fundamental tests of quantum mechanics.