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Optical feedback-enhanced photon entanglement from a biexciton cascade
Sven M Hein1, Franz Schulze1, Alexander Carmele2
1Technische Universität Berlin, Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Hardenbergstraße 36, 10623 Berlin, Germany.
Physical Review Letters
|July 26, 2014
Summary
Optical feedback can enhance photon entanglement from biexciton cascades in solid-state quantum systems. This method overcomes entanglement reduction caused by fine-structure splitting, improving quantum information science applications.
Area of Science:
- Quantum Information Science
- Solid-State Physics
- Photonics
Background:
- Biexciton cascades in solid-state systems are crucial sources of entangled photons.
- Fine-structure splitting of exciton levels typically reduces photon entanglement.
Purpose of the Study:
- To investigate the use of optical feedback to counteract entanglement loss.
- To demonstrate control and enhancement of photon entanglement.
Main Methods:
- Full quantum-mechanical calculations were performed.
- The model incorporated the external photon mode continuum.
- Optical feedback was applied by coherently feeding back emitted signal with controlled phase and delay.
Main Results:
- Optical feedback effectively counteracts entanglement reduction due to fine-structure splitting.
- Substantial control and enhancement of photon entanglement were achieved.
- The study identified mechanisms responsible for entanglement improvement.
Conclusions:
- Optical feedback is a viable strategy for enhancing photon entanglement in solid-state quantum information platforms.
- This technique offers a pathway to improve the fidelity of entangled photon sources.
