标题： 通过单次脉冲弗洛凯驱动实现的鲁棒纠缠光子生成 显示英文标题

标题： Robust entangled photon generation enabled by single-shot Floquet driving

摘要： 由共振双光子激发驱动的量子发射器是可确定性生成纠缠光子对的主要来源，这对可扩展的光子量子技术至关重要。 然而，传统的共振方案对激光功率波动非常敏感，并且对于具有小双激子结合能的发射器带来了额外的实验挑战。 在这里，我们展示如何使用一种超越共振和绝热驱动的新设计原理：超快单次弗洛凯驱动，来识别具有显著提高的鲁棒性和减少激光滤波要求的双激子制备方案。 这是通过采用两个强且对称失谐的双色脉冲实现的，它们的叠加产生了一个频闪哈密顿量，使得基态和双激子态之间能够直接耦合。 此外，脉冲延迟作为一个调节旋钮，引入了一个有效磁场，使布洛赫球轨迹在广泛参数范围内集中在双激子态上，从而使双激子制备特别稳健。 实验上，我们实现了超过96%的双激子占据率，并保持了光子对纠缠的保真度为93.4%。 我们的方案突显了弗洛凯工程多色激发协议对按需量子光源的重大影响。 显示英文摘要

摘要： Quantum emitters driven by resonant two-photon excitation are a leading source for deterministically generated entangled photon pairs, essential for scalable photonic quantum technologies. However, conventional resonant schemes are highly sensitive to laser power fluctuations and pose additional experimental challenges for emitters with small biexciton binding energies. Here, we demonstrate how biexciton preparation schemes with significantly improved robustness and reduced laser filtering requirements can be identified using a novel design principle beyond resonant and adiabatic driving: ultrafast single-shot Floquet driving. This is achieved by employing two strongly and symmetrically detuned dichromatic pulses, whose superposition generates a stroboscopic Hamiltonian that enables direct coupling between ground and biexciton states. Moreover, a pulse delay serves as a tuning knob, introducing an effective magnetic field that concentrates the Bloch sphere trajectory at the biexciton state for a wide range of parameters, making biexciton preparation particularly robust. Experimentally, we achieve a biexciton occupation exceeding 96% and preserve photon-pair entanglement with a fidelity of 93.4%. Our scheme highlights the great impact of Floquet-engineered multicolour excitation protocols for on-demand quantum light sources.