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Quantum correlation of light scattered by disordered media
Optics Express
|November 3, 2017
Summary
Multiple light scattering in disordered media can create quantum correlations. Even classical-like Gaussian states, like thermal states, generate quantum discord when light propagates through such media.
Area of Science:
- Quantum Optics
- Condensed Matter Physics
- Quantum Information Theory
Background:
- Light propagation through disordered media is a complex phenomenon.
- Quantum correlations, such as entanglement and quantum discord, are fundamental resources in quantum information.
- Understanding how these correlations emerge from classical light interactions is crucial.
Purpose of the Study:
- To theoretically investigate the spontaneous generation of quantum correlations.
- To analyze these correlations for Gaussian input states after multiple scattering.
- To quantify output correlations using intensity fluctuations, entanglement, and quantum discord.
Main Methods:
- Theoretical modeling of light scattering in disordered media.
- Analysis of Gaussian quantum states.
- Characterization of output modes using measures of correlation: intensity fluctuations, entanglement, and quantum discord.
Main Results:
- Coherent input states do not generate quantum correlations after multiple scattering.
- All other Gaussian input states spontaneously generate quantum correlations.
- Classical-like states, such as thermal states, produce non-zero quantum discord.
Conclusions:
- Multiple scattering in disordered media is a viable mechanism for generating quantum correlations.
- The nature of the Gaussian input state dictates the type of quantum correlation produced.
- Even seemingly classical states can exhibit quantum properties like discord under these conditions.
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