具有长里德堡相干性的钡基里德堡原子量子技术
Barium-based Rydberg atom quantum technologies with long Rydberg coherence
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中文总结 AI 辅助
研究通过特定双光子激发钡的里德堡态，利用微小双光子波矢消除多普勒极限退相干，该里德堡态因小福斯特缺陷有强相互作用和长辐射寿命，为量子计算和全光量子信息带来新机遇。
中文摘要 AI 辅助
激光激发的里德堡态的短多普勒极限相干时间（通常比里德堡态寿命短几个数量级）阻碍了里德堡介导的量子技术。本文表明，从钡的长寿命 d 轨道时钟态对 6sng $^1G_4$ 里德堡态进行 649nm - 658nm 的双光子激发，可通过微小的双光子波矢实现，有效消除多普勒极限退相干。此外，6sng $^1G_4$ 里德堡态因与附近里德堡态的小福斯特缺陷具有强偶极 - 偶极相互作用且辐射寿命长，这有利于基于单个捕获中性原子的量子计算，并能在原子介质中实现长寿命里德堡极化激元，为全光量子信息带来新机遇。
英文摘要
The short Doppler-limited coherence time of the laser-excited Rydberg state, usually orders of magnitude shorter than the lifetime of the Rydberg state, hinders the Rydberg-mediated quantum technologies. Here, we show that a 649~nm~$-$~658~nm two-photon excitation of the $6sng~^1G_4$ Rydberg state from a long-lived d-orbital clock state of barium can be achieved with a two-photon wavevector that is tiny, which effectively removes the Doppler-limited decoherence. Moreover, the $6sng~^1G_4$ Rydberg state has strong dipole-dipole interaction due to small Förster defect with nearby Rydberg states and possesses long radiative lifetime. These can benefit quantum computing based on individually trapped neutral atoms, and can enable long-lived Rydberg polaritons in atomic media, which brings fresh opportunities in all-optical quantum information.
