Related Experiment Video
Updated: Jul 17, 2026
12:57
Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
Published on: October 13, 2017
Electronic spin precession and interferometry from spin-orbital entanglement in a double quantum dot
1Laboratoire de Physique et Modélisation des Milieux Condensés, CNRS and Université Joseph Fourier, BP 166, 38042 Grenoble, France.
Physical Review Letters
|February 7, 2007
Summary
This study demonstrates how a double quantum dot can entangle electron spin and orbital states. This entanglement allows for geometrical control of spin precession using an Aharonov-Bohm phase in a Kondo regime.
Area of Science:
- Quantum physics
- Condensed matter physics
- Spintronics
Background:
- Quantum dots offer tunable electronic properties.
- Electron spin and orbital degrees of freedom are key in quantum information.
- The Kondo effect describes interactions in quantum systems.
Purpose of the Study:
- To investigate the entanglement of electron spin and orbital degrees of freedom in a double quantum dot system.
- To explore the transfer of Aharonov-Bohm orbital phase to spinor wave functions.
- To demonstrate geometrical control of spin precession within a coherent quantum regime.
Main Methods:
- Utilizing a double quantum dot system connected in parallel to metallic leads.
- Applying an Aharonov-Bohm effect to induce orbital phase shifts.
- Operating within a mixed orbital-spin Kondo regime for coherent behavior.
- Employing spin-polarized leads or a metallic loop configuration to detect spin precession.
Main Results:
- Demonstrated entanglement between electron spin and orbital degrees of freedom.
- Observed transfer of Aharonov-Bohm orbital phase to the spinor wave function.
- Achieved coherent behavior in a mixed orbital-spin Kondo regime.
- Provided methods for obtaining evidence of spin precession.
Conclusions:
- A double quantum dot system enables entanglement of spin and orbital states.
- Geometrical control of spin precession is achievable via Aharonov-Bohm phase.
- Coherent quantum phenomena are observable in mixed orbital-spin Kondo systems.
- Experimental verification of spin precession is feasible using specific setups.
Related Concept Videos
01:03Atomic Nuclei: Nuclear Spin State Overview
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...
03:06The Pauli Exclusion Principle
The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
01:02¹H NMR: Interpreting Distorted and Overlapping Signals
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
02:43Quantum Numbers
It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
01:12Double Resonance Techniques: Overview
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
01:08NMR Spectroscopy: Spin–Spin Coupling
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved in...