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Related Concept Videos

Semiconductors01:22

Semiconductors

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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
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Schottky Barrier Diode01:27

Schottky Barrier Diode

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Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
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MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

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Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
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MOSFET01:16

MOSFET

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The Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) plays a pivotal role in modern electronics thanks to its versatility and efficiency in controlling electrical currents. This device, also known as IGFET, MISFET, and MOSFET, has three main terminals: the Source, Drain, and Gate. MOSFETs are classified into n-channel or p-channel types based on the doping characteristics of their substrate and the source or drain regions.
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Shared control of a 16 semiconductor quantum dot crossbar array.

Francesco Borsoi1, Nico W Hendrickx2, Valentin John2

  • 1QuTech and Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands. f.borsoi@tudelft.nl.

Nature Nanotechnology
|August 28, 2023
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Summary
This summary is machine-generated.

Researchers developed shared control for semiconductor quantum dots, enabling efficient operation of large quantum computing arrays. This scalable approach reduces control lines, overcoming a major hurdle in building practical quantum computers.

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Area of Science:

  • Quantum Computing
  • Solid-State Physics
  • Quantum Information Science

Background:

  • Scaling quantum computers requires efficient control of numerous qubits.
  • Current solid-state approaches use unsustainable brute-force methods with individual control lines per qubit.
  • Millions of qubits necessitate a more efficient control architecture.

Purpose of the Study:

  • To introduce a shared control method for semiconductor quantum dots.
  • To enable efficient operation of a two-dimensional crossbar array in planar germanium.
  • To advance scalable quantum technology by reducing control complexity.

Main Methods:

  • Implemented shared control inspired by classical random-access architectures.
  • Tuned a 16-quantum dot array to the few-hole regime.
  • Confined an odd number of holes per site to isolate unpaired spins.
  • Demonstrated selective control of interdot coupling in double quantum dots.

Main Results:

  • Achieved efficient operation of a 16-quantum dot array using shared control.
  • Successfully isolated unpaired spins in each quantum dot.
  • Demonstrated over 10 GHz tunnel coupling tunability.
  • Showcased a quantum electronic device with fewer control terminals than tunable parameters.

Conclusions:

  • Shared control of semiconductor quantum dots offers a scalable solution for quantum computing.
  • This approach significantly reduces the number of required control lines.
  • It represents a critical advancement towards building large-scale quantum technologies.