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Related Experiment Videos

Entanglement between a photon and a quantum well.

W Hoyer1, M Kira, S W Koch

  • 1Department of Physics, Philipps-University, Renthof 5, D-35032 Marburg, Germany. hoyer@acms.arizona.edu

Physical Review Letters
|August 25, 2004
PubMed
Summary
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Quantum well emission interference occurs due to indistinguishable photon paths, controllable in multiple quantum wells. This phenomenon arises from the lack of translational invariance, leading to unique interference patterns based on in-plane momentum transfer.

Area of Science:

  • Quantum optics
  • Solid-state physics
  • Many-body systems

Background:

  • Spontaneous emission in quantum wells lacks translational invariance, resulting in equal left/right emission probabilities.
  • Interference phenomena are crucial for understanding light-matter interactions in nanostructures.

Purpose of the Study:

  • To investigate quantum interference effects in single and multiple quantum well structures.
  • To explore the role of translational invariance and photon-matter entanglement in emission pathways.

Main Methods:

  • Analysis of spontaneous emission paths from quantum wells.
  • Utilizing a common detector to observe interference fringes from left and right emission.
  • Investigating interference control in multiple-quantum-well systems.

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Main Results:

  • Interference fringes are observed for indistinguishable photon paths with conserved in-plane momentum.
  • Entanglement between photons and Bloch states prevents interference for other emission paths.
  • The spacing between quantum wells in multiple-quantum-well structures allows for control over interference.

Conclusions:

  • Quantum interference in quantum wells is fundamentally linked to translational invariance and path indistinguishability.
  • Photon-Bloch state entanglement dictates the conditions for observable interference.
  • Multiple quantum wells offer a platform for manipulating quantum interference for potential applications.