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Researchers demonstrate a heralded controlled-NOT (CNOT) quantum gate using an on-demand single-photon source. This breakthrough advances photon-photon quantum logic gates for optical quantum computation.

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Area of Science:

  • Quantum Information Science
  • Quantum Optics
  • Solid-State Quantum Systems

Background:

  • Heralded entangling gates are crucial for scalable optical quantum computation.
  • Previous methods using parametric down-conversion faced limitations due to probabilistic sources and double-pair emission.
  • Linear optical systems require efficient and reliable quantum gates for advancement.

Purpose of the Study:

  • To demonstrate a heralded controlled-NOT (CNOT) quantum gate operation between two single photons.
  • To overcome limitations of probabilistic photon sources in quantum computing architectures.
  • To advance the development of photon-photon quantum logic gates.

Main Methods:

  • Utilized an on-demand single-photon source based on a semiconductor quantum dot in a micropillar cavity.
  • Implemented a heralded CNOT gate protocol with free-flying photons.
  • Characterized gate performance by estimating quantum gate fidelity and generating Bell states.

Main Results:

  • Successfully demonstrated a heralded CNOT gate between two single photons for the first time.
  • Achieved an average quantum gate fidelity of (87.8±1.2)%.
  • Generated event-ready Bell states with a fidelity of (83.4±2.4)%.

Conclusions:

  • The developed on-demand single-photon source enables high-fidelity heralded quantum gates.
  • This work represents a significant step towards building scalable photonic quantum computers.
  • The demonstrated CNOT gate is a key building block for future quantum information processing applications.