Related Experiment Video
Updated: Apr 25, 2026
09:23
Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
13.9K
Quantum heat fluctuations of single-particle sources
F Battista1, M Moskalets2, M Albert3
1Division of Mathematical Physics, Lund University, Box 118, S-221 00 Lund, Sweden.
Physical Review Letters
|August 29, 2014
Summary
We theoretically investigate heat noise from single electron sources. This quantum heat noise reveals crucial properties of electron wave functions, offering insights into nonclassical quantum phenomena.
Area of Science:
- Quantum physics
- Mesoscopic physics
Background:
- Single electron sources are crucial for quantum technologies.
- While charge current noise is minimized, energy fluctuations cause heat noise.
- Understanding this heat noise is key to characterizing electron emission.
Purpose of the Study:
- To theoretically investigate the quantum source of heat noise in single electron emitters.
- To explore the relationship between heat noise and single-particle wave function properties.
- To identify nonclassical features in the induced temperature and potential fluctuations.
Main Methods:
- Theoretical modeling of a single electron emitter coupled to an electronic probe.
- Analysis in the hot-electron regime.
- Investigating the distribution of temperature and potential fluctuations.
Main Results:
- Heat current noise arises from energy fluctuations due to the wave packet nature of electrons.
- The distribution of probe fluctuations provides direct information on wave function properties.
- Strong nonclassical features are observed in these fluctuations.
Conclusions:
- Quantum heat noise is a sensitive probe of single-particle wave functions.
- This phenomenon offers a novel way to characterize electron sources.
- The findings highlight unique quantum effects in electron emission and transport.
Related Concept Videos
02:46Quantifying Heat
55.0K
Thermal Energy Microscopically, thermal energy is the kinetic energy associated with the random motion of atoms and molecules. Temperature is a quantitative measure of “hot” or “cold”, which depends on the amount of thermal energy. When the atoms and molecules in an object are moving or vibrating quickly, they have a higher average kinetic energy (KE) (or higher thermal energy), and the object is perceived as “hot”, or it is described as being at a higher...
55.0K
01:14Atomic Nuclei: Nuclear Spin State Population Distribution
1.7K
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
1.7K
01:27Atomic Spectroscopy: Effects of Temperature
1.2K
Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature...
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature...
1.2K
02:44Heating and Cooling Curves
23.1K
When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance,...
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance,...
23.1K
01:03Atomic Nuclei: Nuclear Spin State Overview
1.9K
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
1.9K
02:32The de Broglie Wavelength
25.6K
In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
25.6K