Quantum

Noise-Assisted Quantum Entanglement: Memory-Enhanced Coherence in Stochastic Jaynes-Cummings Dynamics

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Briefings

A study of two-qubit cavity systems analyzed stochastic coupling noise, revealing that single-excitation initial states generate robust entanglement in decoherence-free subspaces, whereas double-excitation states decay without protection. The research identifies a critical photon-number threshold in coherent cavities where dynamics shift from low-frequency to high-frequency oscillations, and demonstrates that strong non-Markovian noise with long correlation times enables resilience against entanglement sudden death through repeated revivals.

Key points

• Single-excitation initial states in a two-qubit cavity system generate robust qubit entanglement within decoherence-free subspaces.
• Double-excitation initial states in the same system exhibit inevitable decay of entanglement without protective symmetries.

Context

This research investigates qubit entanglement dynamics in a two-qubit cavity system with stochastically fluctuating coupling strength, comparing white noise (Markovian) and Ornstein-Uhlenbeck noise (non-Markovian) processes.

Limitations

The study covers only two-qubit cavity systems with stochastic coupling strength; results are limited to Fock and coherent cavity states, and universal entanglement loss occurs at large amplitudes in coherent cavities.

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