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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Long-lived quantum coherence of two-level spontaneous emission models within structured environments
Optics Letters
|October 10, 2013
Summary
We found that quantum coherence in two-level systems can be preserved in noisy environments. This preservation is linked to the reservoir
Area of Science:
- Quantum physics
- Quantum optics
- Condensed matter theory
Background:
- Investigating quantum coherence is crucial for quantum technologies.
- Spontaneous emission in structured environments leads to complex dynamics.
- Non-Markovian effects are significant in open quantum systems.
Purpose of the Study:
- To explore the long-lived quantum coherence in two-level spontaneous emission models.
- To establish a link between system population and reservoir spectral density.
- To understand and optimize the preservation of quantum coherence.
Main Methods:
- Analysis of asymptotic non-Markovian dynamics.
- Derivation of a functional relation between population and spectral density.
- Investigation of quantum coherence using entanglement and quantum discord.
- Focus on Ohmic class reservoirs and their spectral parameters.
Main Results:
- A general functional relation connects system population to reservoir spectral density.
- Quantum coherence preservation is explicitly determined by spectral parameters.
- Optimal strategies for enhancing quantum coherence were identified.
- Demonstrated the role of entanglement and quantum discord in coherence preservation.
Conclusions:
- Long-lived quantum coherence can be maintained in structured, noisy environments.
- Reservoir engineering offers a pathway to enhance stationary quantum coherence.
- The findings contribute to understanding open quantum system dynamics and control.
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