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Nearly deterministic bell measurement for multiphoton qubits and its application to quantum information processing.

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We present a novel Bell-measurement scheme using multi-photon Greenberger-Horne-Zeilinger entanglement. This method enhances quantum teleportation success probability with linear optics, offering a feasible all-optical quantum information processing solution.

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Area of Science:

  • Quantum Information Science
  • Quantum Optics
  • Quantum Computing

Background:

  • Entanglement is a key resource in quantum information processing.
  • Previous Bell-measurement schemes often require complex setups or photon-number-resolving detectors.
  • Greenberger-Horne-Zeilinger (GHZ) states are crucial for multi-particle entanglement studies.

Purpose of the Study:

  • To propose a novel Bell-measurement scheme for Greenberger-Horne-Zeilinger (GHZ) entangled states.
  • To enhance the success probability of Bell measurements and quantum teleportation using multi-photon entanglement.
  • To provide a practical and feasible alternative for all-optical quantum information processing.

Main Methods:

  • Utilizing a logical qubit encoded in GHZ entanglement with an arbitrary number of photons.
  • Employing only linear optics elements and photon on-off measurements.
  • Analyzing success probabilities in comparison to single-photon qubit schemes.

Main Results:

  • The proposed scheme achieves arbitrarily high success probabilities for Bell measurement and GHZ entanglement teleportation.
  • Success probability increases with the number of photons used.
  • The scheme does not require photon-number-resolving measurements, simplifying experimental implementation.
  • Outperforms previous proposals in terms of average photon usage for comparable success probabilities.

Conclusions:

  • The developed Bell-measurement scheme offers a significant advancement for quantum information processing.
  • Its reliance on linear optics and on-off measurements enhances experimental feasibility.
  • This work presents a promising candidate for all-optical quantum information processing applications.