Broome M A, Almeida M P, Fedrizzi A, White A G
ARC Centre for Engineered Quantum Systems, ARC Centre for Quantum Computer and Communication Technology, School of Mathematics and Physics, University of Queensland, 4072 Brisbane, QLD, Australia.
Opt Express. 2011 Nov 7;19(23):22698-708. doi: 10.1364/OE.19.022698.
We present a simple technique to reduce the emission rate of higher-order photon events from pulsed spontaneous parametric down-conversion. The technique uses extra-cavity control over a mode locked ultrafast laser to simultaneously increase repetition rate and reduce the energy of each pulse from the pump beam. We apply our scheme to a photonic quantum gate, showing improvements in the non-classical interference visibility for 2-photon and 4-photon experiments, and in the quantum-gate fidelity and entangled state production in the 2-photon case.
我们提出了一种简单的技术，以降低脉冲自发参量下转换中高阶光子事件的发射率。该技术利用对锁模超快激光器的腔外控制，同时提高重复率并降低泵浦光束每个脉冲的能量。我们将该方案应用于一个光子量子门，结果表明在双光子和四光子实验中，非经典干涉可见度得到了改善，在双光子情况下，量子门保真度和纠缠态产生也得到了改善。
