Patent ID: 7378865
Filing Date: 2008-05-27
Classification: H03K

Abstract:
1. A superconducting circuit, comprising: a first transformer to receive an alternating-current input at a primary-side inductor and to produce a first alternating-current output at a secondary-side inductor; a second transformer to receive the alternating-current input at a primary-side inductor and to produce a second alternating-current output at a secondary-side inductor; a first pulse generating circuit coupled to the secondary-side inductor of the first transformer to produce at an output node a single flux quantum pulse responsive to the first alternating-current output; a second pulse generating circuit coupled to the secondary-side inductor of the second transformer to produce at an output node a single flux quantum pulse responsive to the second alternating-current output; and a confluence buffer circuit coupled to the output node of the first pulse generating circuit and the output node of the second pulse generating circuit to produce a pulse signal made by merging the single flux quantum pulse from the first pulse generating circuit and the single flux quantum pulse from the second pulse generating circuit, wherein each of the first pulse generating circuit and the second pulse generating circuit includes: a superconducting loop including the secondary-side inductor; a first Josephson junction situated in the superconducting loop to generate the single flux quantum pulse; and a second Josephson junction situated in the superconducting loop, a threshold value of the second Josephson junction for an electric current flowing through the secondary-side inductor being different from that of the first Josephson junction.