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MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

442
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.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
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Updated: Aug 19, 2025

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Demonstration of a Quantum Gate Using Electromagnetically Induced Transparency.

K McDonnell1, L F Keary1, J D Pritchard1

  • 1EQOP, Department of Physics, University of Strathclyde, SUPA, Glasgow G4 0NG, United Kingdom.

Physical Review Letters
|December 3, 2022
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Summary
This summary is machine-generated.

Researchers demonstrated a native controlled-NOT (CNOT) gate using neutral atoms and Rydberg states. This advancement enables efficient quantum computing and error correction, achieving a high gate fidelity.

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Area of Science:

  • Quantum Computing
  • Atomic Physics
  • Quantum Information Science

Background:

  • Neutral atoms are promising qubits for quantum computing.
  • Rydberg interactions offer long-range coupling essential for multi-qubit gates.

Purpose of the Study:

  • To demonstrate a native CNOT gate between two individually addressed neutral atoms.
  • To leverage Rydberg blockade for efficient quantum operations.

Main Methods:

  • Utilizing electromagnetically induced transparency (EIT).
  • Employing strong long-range interactions of Rydberg states in the blockade regime.
  • Implementing a pulse sequence independent of qubit number for multiqubit CNOT^k gates.

Main Results:

  • Achieved a loss-corrected CNOT gate fidelity of 0.82(6).
  • Prepared an entangled Bell state with a corrected fidelity of 0.66(5).
  • Identified laser power as a current limitation.

Conclusions:

  • The demonstrated CNOT gate is a simple, efficient building block for quantum algorithms and error correction.
  • Technical improvements are presented to advance towards fault-tolerant quantum computing.