Robust Preparation of Bell States by Time Boundary Effect

Abstract

Quantum entanglement is essential for modern quantum information processing. Entanglement gates convert initially non-entangled states into entangled ones by applying time-dependent parametric pulses. While Bell state preparation has been experimentally validated in various platforms, its stability and fidelity are constrained by environmental decoherence and parametric fluctuations. Here, we propose a dynamically robust method for preparing Bell states by leveraging the time boundary effect and momentum-space projective measurements within Su-Schrieffer-Heeger systems. Employing the Lindblad master equation, we theoretically demonstrate that the prepared Bell states exhibit remarkable robustness against both environmental decoherence and parametric time fluctuations, achieving nearly perfect quantum fidelity, with the momentum conservation law governing this robust behavior. This framework based on the time boundary effect is applicable to both fermionic and bosonic excitations, offering a unified paradigm for generating Bell states in quantum computation and communication.