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Related Concept Videos

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.

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Related Experiment Video

Updated: May 14, 2026

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
14:58

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

Published on: June 3, 2015

Pulse-gated quantum-dot hybrid qubit.

Teck Seng Koh1, John King Gamble, Mark Friesen

  • 1Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.

Physical Review Letters
|February 2, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces fast, high-fidelity quantum gates for quantum computing using a three-electron hybrid qubit in a double quantum dot. Exploiting unique level crossings enables simpler, subnanosecond gate operations.

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Related Experiment Videos

Last Updated: May 14, 2026

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
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Published on: June 3, 2015

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Area of Science:

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

Background:

  • Quantum dots are promising candidates for building qubits.
  • Hybrid qubits offer potential for high-speed quantum operations.
  • Level crossings in quantum dots can be exploited for qubit control.

Purpose of the Study:

  • To implement fast pulsed gating for quantum dots.
  • To develop novel one- and two-qubit quantum gates.
  • To leverage level crossings for efficient qubit manipulation.

Main Methods:

  • Utilizing a three-electron hybrid qubit in a double quantum dot.
  • Exploiting chargelike qubit states at level crossings.
  • Developing direct-current (dc) pulsed gating sequences.

Main Results:

  • Demonstrated simpler dc quantum gates compared to previous ac gates.
  • Obtained closed-form solutions for control sequences.
  • Achieved fast gate operations with subnanosecond durations.
  • Showcased potential for high-fidelity quantum gate implementation.

Conclusions:

  • Fast pulsed gating using level crossings is feasible for quantum dots.
  • The developed dc gates offer a simpler and faster alternative for quantum computation.
  • This approach advances the development of high-performance quantum computing hardware.