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Researchers developed a probabilistic entangling gate using synchronized photons and a quantum memory. This advancement in quantum information processing achieved high fidelity and demonstrated Bell-inequality violation, paving the way for more efficient quantum technologies.

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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Quantum Optics

Background:

  • Efficient quantum information processing relies on controlling photon synchronization from probabilistic sources.
  • Quantum gates are essential building blocks for quantum computation and communication.

Purpose of the Study:

  • To realize a probabilistic entangling gate using actively synchronized photon pairs.
  • To investigate the performance and limitations of such a gate implemented with a quantum memory.

Main Methods:

  • Utilized a quantum memory based on warm atomic vapor for photon storage and synchronization.
  • Implemented a probabilistic entangling gate operation on photon pairs.
  • Measured truth-table fidelity and Bell-inequality violation.

Main Results:

  • Achieved a truth-table fidelity exceeding 85% for the entangling gate.
  • Demonstrated violation of Bell inequalities for all four Bell states.
  • Identified reduced Hong-Ou-Mandel interference visibility due to storage as a key fidelity limitation.

Conclusions:

  • The developed probabilistic entangling gate shows significant promise for quantum information processing.
  • A quantitative relationship between Hong-Ou-Mandel visibility and gate fidelity was derived, applicable to various photonic interference-based gates.