Related Experiment Video
Updated: Jun 5, 2025
09:33
Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
Published on: June 7, 2019
6.2K
Nonreciprocal total cross section of quantum metasurfaces
Nikita Nefedkin1, Michele Cotrufo1, Andrea Alù1,2
1Photonics Initiative, Advanced Science Research Center, City University of New York, New York, NY 10031, USA.
Nanophotonics (Berlin, Germany)
|December 5, 2024
Summary
Researchers achieved significant nonreciprocal responses in quantum metasurfaces by controlling atom positions and frequencies. This breakthrough enables better control over excitation transfer for quantum technologies.
Area of Science:
- Quantum optics
- Condensed matter physics
- Quantum information science
Background:
- Nonreciprocity is crucial for controlling energy and information flow in quantum systems.
- Classical nonlinear interactions in quantum metasurfaces offer potential for nonreciprocal phenomena.
- Applications include quantum information processing and quantum computing.
Purpose of the Study:
- To investigate the realization of nonreciprocal total cross sections in quantum metasurfaces.
- To explore control mechanisms for achieving large nonreciprocal responses.
- To understand the underlying physics of nonreciprocity in these nonlinear systems.
Main Methods:
- Utilizing pairs of parallel periodic arrays of two-level atoms as quantum metasurfaces.
- Analyzing classical interactions among nonlinear scatterers.
- Controlling atomic positions and transition frequencies.
Main Results:
- Demonstrated large nonreciprocal total cross sections in the designed quantum metasurfaces.
- Achieved significant nonreciprocity without requiring a nonreciprocal environment.
- Linked nonreciprocal responses to asymmetric population dynamics of a dark state.
Conclusions:
- Nonreciprocity can be effectively engineered in nonlinear quantum metasurfaces through precise control of atomic parameters.
- The asymmetric population of a dark state is a key mechanism for achieving large nonreciprocal responses.
- This work provides a pathway for developing novel quantum devices for information processing.
Related Concept Videos
01:30Plane Electromagnetic Waves I
3.6K
The existence of combined electric and magnetic fields that propagate through space as electromagnetic (EM) waves is the most significant prediction of Maxwell's equations. As Maxwell's equations hold in free space, the predicted electromagnetic waves do not require a medium for their propagation. An EM wave comprises an electric field, defined as the force per charge on a stationary charge, and a magnetic field, which is the force per charge on a moving charge.
The EM field is assumed...
The EM field is assumed...
3.6K
01:05Total Internal Reflection Fluorescence Microscopy
5.6K
Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
5.6K
01:16Confocal Fluorescence Microscopy
13.0K
Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
13.0K
01:062D NMR: Homonuclear Correlation Spectroscopy (COSY)
955
Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...
955
01:192D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)
639
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...
639