Direct observation system for sub-pico second waveform in time and space

本文在时空坐标系中建立了一个直接观测磁通-反磁通碰撞的系统，讨论了观测波形的条件。作为约瑟夫森采样系统的修改的系统包括机械延迟、电延迟、反馈电路和芯片上的超导电路。我们观测到了时空坐标系下的磁通-反磁通碰撞和消隐波形，这是对固体中量子孤子相互作用的最直接观察。研究了当两个磁通阵反向传播并进行正面碰撞时，空间轴上磁通阵波形的时间演化。观测到的波形表明，两个磁通子阵列在迎头碰撞后湮灭或相互穿过，这取决于线偏置电流的大小。我们还观察到了在时间和空间上传播的磁通阵列波形，其在由6 J-SQUID组成的磁通传输线上传播。6 J-SQUID具有6个结，其中4个结用作等效电感。

We have constructed a direct observation system of fluxon-antifluxon collision in time and space coordinate, and discussed conditions for the observation of waveforms. The system which is a modification of the Josephson sampling system comprises a mechanical delay, an electrical delay, a feedback circuit, and a superconducting circuit on a chip. We have observed the waveforms of the fluxon-antifuxon collision and aniihilation in time and space coordinates which is the dirst observation of the quantum soliton interaction in the solid. We also investigated the time evolutions of fluxon-array waveform in space axis when two fluxon-arrays propagated opposite direction each other, and then carrid out a head-on collision. The observed waveform show that the two fluxon-arrays annihilate or pass through each other after head-on collisions, depending upon the valus of line bias current. We also observed propagating fluxoid-array waveforms in time and space which propagated on a fluxoid transmission line composed of 6J-SQUIDs. The 6J-SQUID has 6 junctions in which 4 junctions are used as equivalent inductance.