Patent ID: 6608518
Filing Date: 2003-08-19
Classification: B82Y,G06N,H03K

Abstract:
A superconducting single flux quantum circuit, comprising:a signal storing circuit, comprising: a first inductor; Josephson junctions connected to opposite ends of the first inductor, for forming a loop through which a circulating current flows between the first inductor and a grounded circuit; a signal input terminal connected to the one end of the first inductor via a Josephson junction, for inputting a single flux quantum pulse; and a clock input terminal connected to the other end of the first inductor via a Josephson junction, for inputting a clock pulse, the circulating current being caused to flow through the first inductor by the single flux quantum pulse inputted to the signal input terminal, the circulating current of the first inductor being interrupted by the clock pulse inputted to the clock input terminal during the flow of the circulating current, and a single flux quantum pulse being outputted from an output terminal withdrawn from a connection point of the clock input terminal and the first inductor; and a circulating current canceling circuit, comprising: a second inductor connected to a position to divide the fist inductor into roughly equal halves; series-connected two Josephson junctions for grounding the other end of the second inductor; a bias current source connected to a connection point between the series-connected two Josephson junctions, for supplying a bias current; an initializing pulse input terminal connected via a Josephson junction connected to the connection point between the series-connected two Josephson junctions, for inputting an initializing pulse; and an output terminal for outputting the state of the connection point between the series-connected two Josephson junctions, and, a Josephson junction being inserted in series to the one end of the inductor closer to the clock input terminal of the first inductor divided into halves.