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Updated: Jun 16, 2025
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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
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Entanglement, squeezing and non-locality limits in filtered two-mode squeezed mixed states
Optics Express
|June 14, 2025
Summary
We explored entanglement and non-locality in squeezed mixed states using spectral filters. Optimal conditions were found with identical filters, while non-identical filters disrupted these properties.
Area of Science:
- Quantum optics
- Quantum information theory
Background:
- Continuous variable (CV) states are crucial for quantum information processing.
- Entanglement and non-locality are key resources for quantum technologies.
- Optomechanical systems offer practical platforms for studying quantum phenomena.
Purpose of the Study:
- To investigate entanglement and non-locality in specific spectral components of CV two-mode squeezed mixed states.
- To determine the limits of entanglement and non-locality under varying filter conditions.
- To explore the relationship between hybrid quadrature squeezing and entanglement measures.
Main Methods:
- Utilizing filters on output modes of two-mode squeezed mixed states.
- Analyzing spectral components to quantify entanglement and non-locality.
- Evaluating the squeezing of two-mode hybrid quadrature as an entanglement witness.
Main Results:
- Entanglement and non-locality peak when identical spectral filters are applied.
- Increasing input squeezing with non-identical filters leads to a bell-shaped disruption of entanglement and non-locality.
- Precise boundaries for entanglement and non-locality were established.
- Two-mode hybrid quadrature squeezing was shown to be analogous to logarithmic negativity.
Conclusions:
- Spectral filtering in optomechanical systems significantly impacts entanglement and non-locality.
- Filter characteristics and input squeezing levels are critical for preserving quantum correlations.
- Hybrid quadrature squeezing provides a viable measure of entanglement in these systems.
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