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Field-effect transistors (FETs) are integral to electronic circuits and distinguished by their three-terminal setup: the gate, drain, and source. These transistors operate as unipolar devices, which utilize either electrons or holes as charge carriers, in contrast to bipolar transistors, which use both types of carriers. The primary function of the FET is to modulate the flow of these carriers from the source to the drain through a channel. The voltage difference between the gate and source...
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Related Experiment Video

Updated: Aug 31, 2025

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Molecular transistors as substitutes for quantum information applications.

Archit Dhingra1, Xuedong Hu2, Mario F Borunda3

  • 1Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE 68588-0299, United States of America.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|August 23, 2022
PubMed
Summary

Researchers explore alternatives to entangled qubits for quantum information science (QIS). Solid-state Mach-Zehnder interferometers using molecular systems offer a new path for quantum logic gates without entanglement, addressing scalability challenges.

Keywords:
Mach–Zehnder interferometermolecular transistorsquantum devicesquantum information science

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Area of Science:

  • Quantum Information Science (QIS)
  • Solid-state Physics
  • Molecular Magnetism

Background:

  • Quantum information science (QIS) applications typically depend on generating and manipulating qubits.
  • Entangled states are a common requirement for many quantum information processing tasks.

Purpose of the Study:

  • To discuss an alternative approach to qubits for QIS devices.
  • To explore the potential of solid-state Mach-Zehnder interferometers for quantum information processing.
  • To investigate quantum information processes in molecular systems with large magnetic anisotropy.

Main Methods:

  • Conceptual analysis of solid-state Mach-Zehnder interferometers.
  • Mathematical insights into quantum information processes involving molecular systems.
  • Discussion of transistor fabrication using molecular systems with large magnetic anisotropy.

Main Results:

  • Solid-state Mach-Zehnder interferometers can utilize local moments and spin polarization as alternatives to light polarization.
  • Molecular systems with large magnetic anisotropy can form the basis for quantum logic gates that do not require entangled states.
  • Novel approaches for quantum device scalability are being considered, though material discovery remains a challenge.

Conclusions:

  • Quantum devices can potentially be realized without relying on entangled states.
  • Molecular systems with significant magnetic anisotropy offer a promising route for non-entangled quantum logic.
  • Material science advancements are crucial for overcoming scalability hurdles in quantum device development.