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A quantum Fredkin gate.

Raj B Patel1, Joseph Ho1, Franck Ferreyrol2

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Summary
This summary is machine-generated.

Researchers demonstrate the first quantum Fredkin gate using photonic qubits, a crucial step for building scalable quantum computers. This breakthrough enables efficient control of complex quantum operations, advancing quantum information processing.

Keywords:
Fredkin (controlled-SWAP) gateGHZ statescircuitsdownconversionentanglementlogic gatephotonsquantum computersquantum opticsqubits

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Area of Science:

  • Quantum Computing
  • Quantum Information Science
  • Photonic Quantum Technologies

Background:

  • Realizing scalable quantum computers requires efficient logic gates.
  • Complex quantum operations, like the Fredkin gate, remain challenging to implement.
  • Existing quantum systems face difficulties in scaling for advanced computations.

Purpose of the Study:

  • To demonstrate the first quantum Fredkin (controlled-SWAP) gate.
  • To develop a method for adding control to arbitrary quantum operations.
  • To advance the development of efficient quantum circuits for quantum information processing.

Main Methods:

  • Utilized photonic qubit logic to implement the quantum Fredkin gate.
  • Developed a technique to add control operations to black-box unitaries.
  • Implemented example quantum algorithms and generated high-fidelity three-photon Greenberger-Horne-Zeilinger states.

Main Results:

  • Successfully demonstrated the first quantum Fredkin gate.
  • Achieved the highest-fidelity three-photon Greenberger-Horne-Zeilinger states to date.
  • Showcased a novel technique for controlling two-qubit operations.

Conclusions:

  • The demonstrated quantum Fredkin gate is a significant advancement for quantum computing.
  • The new technique enables efficient control of black-box unitaries, overcoming limitations of the standard circuit model.
  • This work paves the way for realizing larger, more complex controlled quantum circuits efficiently.