Related Experiment Video
Updated: Sep 6, 2025
07:56
A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
8.6K
Unidirectional vortex waveguides and multistable vortex pairs in polariton condensates
Optics Letters
|July 1, 2022
Summary
Researchers explored vortex carriers in microcavity polariton condensates, creating stable vortex-antivortex pairs and one-way vortex waveguides. These findings advance potential applications in topological quantum information processing.
Area of Science:
- Condensed matter physics
- Quantum optics
- Topological photonics
Background:
- Vortices with quantized topological charges are key for information processing.
- Microcavity polariton condensates offer a platform for studying quantum phenomena.
Purpose of the Study:
- Investigate vortex carriers and waveguides in microcavity polariton condensates.
- Explore the formation and control of vortex states using patterned excitation.
Main Methods:
- Nonresonant homogeneous pumping of polariton condensates with intensity grooves.
- Utilizing ring-shaped intensity grooves to create dark-ring states.
- Analyzing the stability and dynamics of vortex-antivortex pairs and waveguides.
Main Results:
- Dark-ring states with π-phase jumps were observed, analogous to dark solitons.
- Stable multiple vortex-antivortex pair states formed within dark rings.
- Higher-order dark states were created, serving as unidirectional vortex waveguides.
Conclusions:
- Dark-ring states can host stable vortex-antivortex pairs.
- Engineered dark states enable unidirectional vortex propagation, a significant step for topological quantum information processing.
Related Concept Videos
01:29Potential Due to a Polarized Object
467
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
467
01:28Standing Waves in a Cavity
1.0K
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
1.0K
01:28Induced Electric Dipoles
4.3K
A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
4.3K
01:31Dielectric Polarization in a Capacitor
5.0K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
5.0K
01:15Standing Electromagnetic Waves
1.7K
Electromagnetic waves can be reflected; the surface of a conductor or a dielectric can act as a reflector. As electric and magnetic fields obey the superposition principle, so do electromagnetic waves. The superposition of an incident wave and a reflected electromagnetic wave produces a standing wave analogous to the standing waves created on a stretched string.
Suppose a sheet of a perfect conductor is placed in the yz-plane, and a linearly polarized electromagnetic wave traveling in the...
Suppose a sheet of a perfect conductor is placed in the yz-plane, and a linearly polarized electromagnetic wave traveling in the...
1.7K
01:01Group Polarization
35.4K
Group polarization is the strengthening of an original group attitude following the discussion of views within a group (Teger & Pruitt, 1967). That is, if a group initially favors a viewpoint, after discussion the group consensus is likely a stronger endorsement of the viewpoint. Conversely, if the group was initially opposed to a viewpoint, group discussion would likely lead to stronger opposition.
35.4K