Kinetic Momentum Quantum Transition Device

Tsutomu YAMASHITA 

Publication
IEICE TRANSACTIONS (1976-1990)  Vol.E69  No.7  pp.803-807
Publication Date: 1986/07/20
Online ISSN: 
Print ISSN: 0000-0000
Type of Manuscript: PAPER
Category: Other Devices
Keyword: 


Full Text: PDF(390.8KB)

Summary: 
A new switching gate called a kinetic momentum quantum transition device is proposed. The device is composed of two SQUIDs; one is a guantum flux generator and the other is a flux detector. The two SQUIDs are magnetically coupled with each other. The principle of operation is based on the quantized effective flux generated by the SQUID with a small inductance (LI0φ0) and detected by the other SQUID. The device operations were demonstrated experimentally using the fabricated coupled SQUIDs having lead-alloy Josephson junctions. The experimental results were analysed quantitatively using the proposed model for devices. The input-output chracteristics of the device showed step-function-like nonlinearity resulting in a very high current gain. The input and output are well separated from each other. Because of the small necessary inductances, the device-size is one tenth smaller than usual SQUID gates.