Comparative Analysis of Robust Entanglement Generation in Engineered XX Spin Chains.

Area of Science:

• Quantum Information Science
• Condensed Matter Physics
• Quantum Computing

Background:

• Entanglement generation is crucial for quantum information processing.
• Existing protocols face challenges with fidelity, speed, and noise resilience.
• Spin chains offer a platform for studying quantum phenomena.

Purpose of the Study:

• To numerically compare two entanglement generation protocols in finite XX spin chains.
• To evaluate protocol performance across different spin magnitudes (s=1/2, 1, 3/2).
• To assess protocol robustness against various noise sources and non-Markovian effects.

Main Methods:

• Numerical investigation of entanglement generation protocols.
• Comparison of Protocol 1 (staggered couplings) and Protocol 2 (dual-port architecture).
• Analysis using the pseudomode formalism to characterize non-Markovian noise impact.

Main Results:

• Protocol 2 consistently outperforms Protocol 1 in entanglement fidelity and generation speed.
• Protocol 2 demonstrates superior robustness against diagonal/off-diagonal disorder and dephasing noise.
• The dual-port mechanism remains effective under non-Markovian noise, reducing environment-induced backflow.

Conclusions:

• The dual-port protocol (P2) is a more efficient and robust method for entanglement generation.
• P2's resilience to noise and non-Markovian effects makes it suitable for solid-state quantum platforms.
• This work provides a promising framework for scalable entanglement distribution in quantum technologies.