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Cavity-based architecture to preserve quantum coherence and entanglement
Zhong-Xiao Man1, Yun-Jie Xia1, Rosario Lo Franco2,3,4
1Shandong Provincial Key Laboratory of Laser Polarization and Information Technology, Department of Physics, Qufu Normal University, Qufu 273165, China.
Scientific Reports
|September 10, 2015
Summary
Protecting quantum resources is key for quantum technology. This study demonstrates a two-cavity system that controls quantum environments, significantly extending qubit coherence and entanglement lifetimes.
Area of Science:
- Quantum Information Science
- Quantum Optics
- Condensed Matter Physics
Background:
- Quantum technologies leverage quantum coherence and entanglement for computation.
- Environmental interactions degrade these fragile quantum resources.
- Structured and non-Markovian environments offer potential protection strategies.
Purpose of the Study:
- To investigate a novel environmental architecture for protecting quantum resources.
- To demonstrate control over Markovian and non-Markovian dynamics for a qubit.
- To enhance entanglement control and lifetimes for multi-qubit systems.
Main Methods:
- Engineering a two-coupled lossy cavity environment for a central qubit.
- Analyzing qubit dynamics and coherence under varying environmental coupling.
- Implementing and analyzing entanglement control for two qubits within circuit quantum electrodynamics.
Main Results:
- A two-cavity system enables switching between Markovian and non-Markovian regimes.
- Indefinite qubit coherence preservation is achievable with a perfect auxiliary cavity.
- Entanglement lifetimes are extended by orders of magnitude compared to spontaneous decay.
Conclusions:
- A simple, scalable cavity-based architecture effectively protects quantum resources.
- This approach significantly enhances coherence and entanglement durations.
- The demonstrated control is feasible with current circuit quantum electrodynamics parameters.
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