Stable switch action based on quantum interference effect

Although devices working on quantum principles can revolutionize the electronic industry, they have not been achieved yet as it is difficult to control their stability. We show that one can use evanescent modes to build stable quantum switches. The physical principles that make this possible is explained in detail. Demonstrations are given using a multichannel Aharonov–Bohm interferometer. We propose a new S matrix for multichannel junctions to solve the scattering problem.

Graphical AbstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Contradicting Landauer's claim that devices based on quantum interference principles cannot be achieved. ► Showing some principles by which switch action based on interference principle can be stable and robust. ► Operational characteristics of a quantum switch can be made independent of impurity configuration, temperature, Fermi energy, etc. ► Solution of a multichannel Aharonov–Bohm ring including channel mixing and evanescent modes. ► Proposing a new junction S-matrix including the effect of channel mixing.