A photon-photon quantum gate based on Rydberg interactions
A photon-photon quantum gate based on Rydberg interactions
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DOI：
10.1038/s41567-018-0313-7
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发表时间：
2019-02-01
期刊：
影响因子：
19.6
通讯作者：
Duerr, Stephan
中科院分区：
文献类型：
--
作者：
Tiarks, Daniel;Schmidt-Eberle, Steffen;Duerr, Stephan
中性原子的里德伯态之间的相互作用很强且长程，使其在量子技术的背景下使用具有吸引力。最近，这个想法的首次应用已在量子计算（1）和量子模拟（2-4）领域被报道。此外，电磁感应透明度允许人们将这些里德伯相互作用映射到光(5-15)。在这里，我们利用这种映射以及由此产生的光子之间的相互作用来实现光子-光子量子门(16,17)，展示了里德伯系统作为量子通信和量子网络平台的潜力(18)。我们测量了保真度为 70(8)% 的受控非真值表和纠缠门保真度为 63.7(4.5)% 的受控非真值表，两者都是在检测到控制光子和目标光子时进行后选择的。这里达到的控制水平是探索新型光子多体态或未来在量子通信和量子网络中的应用迈出的令人鼓舞的一步(18)。
The interaction between Rydberg states of neutral atoms is strong and long-range, making it appealing to put it to use in the context of quantum technologies. Recently, first applications of this idea have been reported in the fields of quantum computation(1) and quantum simulation(2-4). Furthermore, electromagnetically induced transparency allows one to map these Rydberg interactions to light(5-15). Here we exploit this mapping and the resulting interaction between photons to realize a photon-photon quantum gate(16,17), demonstrating the potential of Rydberg systems as a platform also for quantum communication and quantum networking(18). We measure a controlled-NOT truth table with a fidelity of 70(8)% and an entangling-gate fidelity of 63.7(4.5)%, both post-selected upon detection of a control and a target photon. The level of control reached here is an encouraging step towards exploring novel many-body states of photons or for future applications in quantum communication and quantum networking(18).