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Related Concept Videos

Feedback control systems01:26

Feedback control systems

Feedback control systems are categorized in various ways based on their design, analysis, and signal types.
Linear feedback systems are theoretical models that simplify analysis and design. These systems operate under the principle that their output is directly proportional to their input within certain ranges. For instance, an amplifier in a control system behaves linearly as long as the input signal remains within a specific range. However, most physical systems exhibit inherent nonlinearity...
Biasing of FET01:22

Biasing of FET

Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the gate...
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
Root Loci for Positive-Feedback Systems01:23

Root Loci for Positive-Feedback Systems

The Hartley oscillator is a positive feedback system that sustains oscillations by feeding the output back to the input in phase, thereby reinforcing the signal. Positive feedback systems can be viewed as negative feedback systems with inverted feedback signals. In these systems, the root locus encompasses all points on the s-plane where the angle of the system transfer function equals 360 degrees.
The construction rules for the root locus in positive feedback systems are similar to those in...

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Related Experiment Video

Updated: May 14, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Feedback control of a solid-state qubit using high-fidelity projective measurement.

D Ristè1, C C Bultink, K W Lehnert

  • 1Kavli Institute of Nanoscience, Delft University of Technology, PO Box 5046, 2600 GA Delft, The Netherlands.

Physical Review Letters
|February 2, 2013
PubMed
Summary

We demonstrate fast and deterministic qubit reset using feedback control, enabling over 10x faster experiments. This closed-loop control is crucial for quantum error correction and teleportation protocols.

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Last Updated: May 14, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Area of Science:

  • Quantum Computing
  • Superconducting Qubits
  • Quantum Control

Background:

  • Superconducting transmon qubits are fundamental building blocks for quantum computers.
  • Efficient qubit initialization and control are critical for scalable quantum computation.

Purpose of the Study:

  • To demonstrate feedback control for rapid and deterministic qubit reset.
  • To enable faster experimental cycles in quantum computing.

Main Methods:

  • Utilizing discrete, projective measurement.
  • Implementing conditional coherent driving for feedback.
  • Applying closed-loop control to superconducting transmon qubits.

Main Results:

  • Achieved a fast and deterministic qubit reset with 2.4% error.
  • Enabled experimental concatenation over 10 times faster than passive initialization.

Conclusions:

  • Feedback control offers a significant speedup for quantum experiments.
  • This technique is essential for measurement-based quantum protocols like error correction and teleportation.