Quantum Entanglement with High Fidelity in a Rydberg Blockade System via an Effective Hamiltonian
摘要
The Rydberg blockade mechanism is a powerful tool for enabling deterministic entanglement in neutral-atom quantum computing and simulation. In this work, we investigate the coherent dynamics of a three-level atomic ensemble, where the highest energy level corresponds to a highly excited Rydberg state, and driven by two laser fields, incorporating detuning effects via an effective Hamiltonian that enforces the Rydberg blockade condition. First, we analyze the system’s eigen structure and derive conditions for the existence of a dark state. Then, to quantify entanglement generation, we compute the Fidelity with respect to a target Bell state and demonstrate that a gradient-free optimization of the single-atom detunings