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Related Experiment Videos

Entanglement on demand through time reordering.

J E Avron1, G Bisker, D Gershoni

  • 1Department of Physics, Technion-Israel Institute of Technology, 32000 Haifa, Israel.

Physical Review Letters
|June 4, 2008
PubMed
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Researchers demonstrate a novel method to generate entangled photons on demand using time reordering. This technique overcomes initial "which path information" to create polarization-entangled photon pairs deterministically.

Area of Science:

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

Background:

  • Generating entangled photon pairs is crucial for quantum information processing.
  • Existing methods often struggle with deterministic generation or preserving entanglement.
  • Radiative decay cascades typically emit photons with inherent which-path information, preventing entanglement.

Purpose of the Study:

  • To propose and theoretically demonstrate a novel scheme for on-demand generation of entangled photons.
  • To show that quantum chronological manipulation can overcome which-path information.
  • To explore the application of this scheme to biexciton cascades in quantum dots.

Main Methods:

  • A novel scheme involving unitary time reordering of photons emitted from a radiative decay cascade.

Related Experiment Videos

  • Theoretical analysis of photon polarization and path information before and after time reordering.
  • Focus on deterministic and lossless (unitary) manipulation of quantum states.

    • Main Results:

    • The proposed scheme successfully generates polarization-entangled photon pairs.
    • Entanglement is achieved despite the initial presence of which-path information in the emitted photons.
    • Quantum chronology manipulation is shown to be lossless and deterministic.

    Conclusions:

    • Unitary time reordering offers a viable pathway for deterministic, on-demand entangled photon generation.
    • This approach provides a new method to manipulate quantum information by controlling quantum chronology.
    • The theory is applicable to physical systems like semiconductor quantum dots, particularly biexciton cascades.