Related Experiment Video
Updated: May 4, 2026
17:14
Compact Quantum Dots for Single-molecule Imaging
Published on: October 9, 2012
17.5K
Quantum correlation among photons from a single quantum dot at room temperature
1Department of Electrical and Computer Engineering, University of California, Santa Barbara 93106, USA.
Nature
|September 13, 2000
Summary
Researchers observed photon antibunching from a single quantum dot, demonstrating it as a solid-state source of non-classical light. This artificial system behaves like a single atom, unlike clusters of quantum dots.
Area of Science:
- Quantum optics
- Solid-state physics
- Materials science
Background:
- Classical electromagnetism (Maxwell's equations) describes statistical fluorescence but not correlations from single emitters.
- Quantization of the radiation field is necessary for understanding single quantum emitter light correlations.
- Photon antibunching in atomic resonance fluorescence confirms non-classical radiation.
Purpose of the Study:
- To experimentally observe photon antibunching from a single quantum dot at room temperature.
- To establish quantum dots as artificial atoms and solid-state sources of non-classical light.
- To investigate the photon emission statistics from single quantum dots versus clusters.
Main Methods:
- Experimental observation of photon emission.
- Measurement of photon correlations (antibunching).
- Utilizing a single cadmium selenide quantum dot at room temperature.
Main Results:
- Photon antibunching was observed from a single cadmium selenide quantum dot.
- Single quantum dots exhibit discrete anharmonic spectra, behaving like artificial atoms.
- Photon emission from clusters of quantum dots showed uncorrelated events.
Conclusions:
- Single quantum dots serve as solid-state sources of non-classical light.
- Quantum dots mimic the behavior of single atoms in terms of photon emission.
- The anharmonic spectrum of single quantum dots is crucial for non-classical light generation.
Related Concept Videos
02:32The de Broglie Wavelength
25.7K
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...
25.7K
02:45The Quantum-Mechanical Model of an Atom
47.1K
Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing...
47.1K
01:192D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)
1.3K
Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
1.3K
01:04¹³C NMR: ¹H–¹³C Decoupling
1.7K
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
1.7K
01:16IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration
3.3K
A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to...
According to Hooke's law, the vibrational frequency is directly proportional to...
3.3K
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