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Related Experiment Videos

Entangled photon pairs from semiconductor quantum dots.

N Akopian1, N H Lindner, E Poem

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

Physical Review Letters
|May 23, 2006
PubMed
Summary
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Spectral filtering of photon pairs from biexciton decay creates entanglement. This quantum entanglement satisfies the Peres criterion and violates Bell's inequality, confirming the entanglement of photon polarization.

Area of Science:

  • Quantum optics
  • Solid-state physics
  • Quantum information science

Background:

  • Biexciton decay in quantum dots is a source of entangled photon pairs.
  • Understanding and controlling quantum entanglement is crucial for quantum technologies.
  • Spectral filtering is a technique used to manipulate photon properties.

Purpose of the Study:

  • To investigate the effect of spectral filtering on photon pair entanglement from biexciton decay.
  • To experimentally verify entanglement using established criteria and inequalities.
  • To analyze the role of "which path" information in the observed entanglement.

Main Methods:

  • Tomographic analysis of photon polarization states.
  • Measurement of the photon pair density matrix.

Related Experiment Videos

  • Application of spectral filtering to emitted photons.
  • Testing against the Peres criterion for entanglement.
  • Testing for violations of Bell's inequality.

    • Main Results:

    • Spectral filtering induces entanglement in photon polarization.
    • The measured density matrix confirms entanglement beyond experimental uncertainty ( > 3 standard deviations).
    • Bell's inequality is violated, providing strong evidence for entanglement.
    • "Which path" information is erased by spectral filtering.

    Conclusions:

    • Spectral filtering is an effective method to generate entangled photon pairs from biexciton decay.
    • The observed entanglement is robust and verifiable through established quantum mechanical tests.
    • Quantum dot systems offer a viable platform for generating and manipulating entangled photons for quantum applications.