Josephson junction with spacer

US10170679B2 · kind B2 · utility

Assignee

• International Business Machines Corporation · US

Inventors

• Josephine B. Chang · Mahopac, US
• Michael A. Guillorn · Locke, US
• Ryan M. Martin · New York, US
• Jeffrey W. Sleight · Ridgefield, US

Key dates

• Filing date: Oct 18, 2017
• Grant date: Jan 1, 2019
• Expiry date: Oct 18, 2037

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10N60/0912

Abstract

Various embodiments are directed toward a circuit configured to act as a Josephson junction. The circuit includes: a junction stack on a substrate, the junction stack including a portion of a first superconductor electrode, with an interface layer on a top side of the first superconductor electrode and configured to act as a tunneling barrier for the junction stack. The circuit may also comprise a first portion of a second superconductor electrode on top of the interface layer. A spacer may separate the portion of the first superconductor electrode in the junction stack from a second portion of the second superconductor electrode outside the junction stack where the second superconductor electrode overlays the first superconductor electrode, the second portion of the second superconductor electrode contacting the substrate on at least one side of the spacer.