Related Experiment Video
Updated: Apr 29, 2026
06:42
Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
9.0K
Dynamical control of interference using voltage pulses in the quantum regime.
Benoit Gaury1, Xavier Waintal1
1CEA-INAC/UJF Grenoble 1, SPSMS UMR-E 9001, Grenoble F-38054, France.
Nature Communications
|May 16, 2014
Summary
Extremely fast voltage pulses in nanoelectronics can dynamically engineer quantum interference patterns. This opens new avenues for quantum information manipulation and reveals unique physical signatures in quantum systems.
Area of Science:
- Quantum mechanics
- Nanoelectronics
- Quantum information science
Background:
- Nanoelectronic experiments are increasingly operating at high frequencies, approaching device characteristic timescales.
- This high-frequency regime offers novel opportunities for investigating quantum dynamics.
Purpose of the Study:
- To theoretically investigate the propagation of quantum voltage pulses through electronic interferometers.
- To explore the potential of ultrafast pulses for manipulating quantum information and interference patterns.
Main Methods:
- Theoretical modeling of voltage pulse propagation in quantum regimes.
- Simulation of electronic interferometers (Fabry-Perot and Mach-Zehnder).
- Analysis of time-resolved quantum nanoelectronics for large systems.
Main Results:
- Ultrafast voltage pulses can dynamically engineer quantum interference patterns.
- Observed phenomena include interference restoration under large bias voltages.
- Negative currents and oscillations in transmitted charge were detected.
Conclusions:
- Extremely fast voltage pulses are a novel tool for quantum information manipulation.
- The study reveals unique physical signatures in high-frequency nanoelectronic systems.
- Advances in simulating time-resolved quantum nanoelectronics enabled these findings.
Related Concept Videos
02:18Interference and Diffraction
28.7K
Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
28.7K
00:53Sound Waves: Interference
4.1K
Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
4.1K
01:07Interference and Superposition of Waves
5.8K
When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
5.8K
01:07Time-Domain Interpretation of PD Control
500
Proportional-Derivative (PD) control is a widely used control method in various engineering systems to enhance stability and performance. In a system with only proportional control, common issues include high maximum overshoot and oscillation, observed in both the error signal and its rate of change. This behavior can be divided into three distinct phases: initial overshoot, subsequent undershoot, and gradual stabilization.
Consider the example of control of motor torque. Initially, a positive...
Consider the example of control of motor torque. Initially, a positive...
500
01:21Time and frequency -Domain Interpretation of Phase-lag Control
472
Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
472
01:10Interference: Path Lengths
2.5K
Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
2.5K