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Time-asymmetric quantum fluctuations in intensity-amplitude correlation for a driven cavity QED system
Optics Express
|March 3, 2020
Summary
This study explores intensity-amplitude correlations in a cavity quantum electrodynamics (QED) system with two atoms. Researchers observed time-asymmetry and non-Gaussian fluctuations, revealing insights into quantum system dynamics.
Area of Science:
- Quantum optics
- Cavity Quantum Electrodynamics (QED)
Background:
- Investigating quantum systems with multiple atoms is crucial for understanding complex quantum phenomena.
- Cavity QED systems offer a platform for studying light-matter interactions at a fundamental level.
Purpose of the Study:
- To investigate the intensity-amplitude correlation functions in a driven cavity QED system with two non-identical atoms.
- To explore the emergence of time-asymmetry and non-Gaussian fluctuations under specific driving conditions.
Main Methods:
- Utilized conditional homodyne detection to experimentally measure time-dependent intensity-amplitude correlation functions.
- Analyzed the third-order moment based on complete-collapse and partial-collapse scenarios.
- Examined nonclassical features such as photon bunching and squeezing.
Main Results:
- Observed time-asymmetry in correlations when the driving field is resonant with the two-photon excitation state, leading to non-Gaussian fluctuations.
- Identified the distinction of the third-order moment as the origin of these phenomena, dependent on measurement sequence.
- Found that photon bunching is a consistent feature, while squeezing is present only under weak driving conditions.
Conclusions:
- The study introduces a new classical inequality using homodyne cross-correlation measurements to identify nonclassicality in non-Gaussian systems.
- The findings provide a deeper understanding of quantum correlations and nonclassical features in driven multi-atom cavity QED systems.
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