Joint Quantum Centre (JQC) Durham-Newcastle, Department of Physics, Durham University, Rochester Building, South Road, Durham DH1 3LE, United Kingdom.
Phys Rev Lett. 2014 Jan 31;112(4):040501. doi: 10.1103/PhysRevLett.112.040501. Epub 2014 Jan 28.
In this Letter, we propose a hybrid scheme to implement a photonic controlled-z (CZ) gate using photon storage in highly excited Rydberg states, which controls the effective photon-photon interaction using resonant microwave fields. Our scheme decouples the light propagation from the interaction and exploits the spatial properties of the dipole blockade phenomenon to realize a CZ gate with minimal loss and mode distortion. By excluding the coupling efficiency, fidelities exceeding 95% are achievable and are found to be mainly limited by motional dephasing and the finite lifetime of the Rydberg levels.
在这封信中，我们提出了一种混合方案，使用高度激发的里德堡态中的光子存储来实现光子控制-z（CZ）门，该方案使用共振微波场控制有效的光子-光子相互作用。我们的方案将光传播与相互作用解耦，并利用偶极阻塞现象的空间特性来实现具有最小损耗和模式失真的 CZ 门。不考虑耦合效率，保真度可超过 95%，并且发现主要受到运动去相位和里德堡能级有限寿命的限制。
