Related Experiment Video
Updated: Jun 17, 2025
00:07
A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
8.4K
Nonreciprocal Bundle Emissions of Quantum Entangled Pairs
Qian Bin1,2, Hui Jing3, Ying Wu1
1School of Physics and Institute for Quantum Science and Engineering, <a href="https://ror.org/00p991c53">Huazhong University of Science and Technology</a>, and Wuhan Institute of Quantum Technology, Wuhan 430074, China.
Physical Review Letters
|August 9, 2024
Summary
Researchers achieved precise control over multiquanta emission using a spinning resonator. This enables directional entangled particle emission, crucial for quantum information processing and hybrid quantum networks.
Area of Science:
- Quantum Physics
- Quantum Information Science
Background:
- Precise control over multiquanta emission is essential for advancing quantum information processing.
- Integrating advanced quantum state manipulation techniques is key to enhancing quantum technologies.
Purpose of the Study:
- To achieve nonreciprocal multiquanta emission through resonator manipulation.
- To enable directional emission of entangled photon-phonon and photon-magnon pairs.
- To explore applications in quantum networks and on-chip communication.
Main Methods:
- Inducing the Sagnac effect by spinning a resonator.
- Optically driving resonance transitions to achieve nonreciprocal super-Rabi oscillations.
- Opening dissipative channels to facilitate directed entangled pair emission.
Main Results:
- Demonstrated nonreciprocal photon-phonon and photon-magnon super-Rabi oscillations.
- Achieved directional bundled emissions of entangled photon-phonon and photon-magnon pairs.
- Showcased simultaneous, directional emissions of different entangled pairs by varying resonator drive directions.
Conclusions:
- Developed a flexible, precision-controlled method for directional entangled multiquanta emitters.
- This technique offers potential for building robust hybrid quantum networks.
- The findings pave the way for advanced on-chip quantum communication systems.
Related Concept Videos
01:17Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals
2.5K
Ideally, an unpaired electron shows a single peak in the EPR spectrum due to the transition between the two spin energy states. However, coupling interactions can occur between the spins of the unpaired electron and any neighboring spin-active nuclei. This hyperfine coupling results in hyperfine splitting, where the EPR signal is split into multiplets. The signals split into 2nI + 1 peaks, where n is the number of equivalent nuclei and I is the nuclear spin. These splitting patterns provide...
2.5K
01:10Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule
1.2K
In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1 triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
1.2K
01:27¹H NMR: Long-Range Coupling
1.7K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
1.7K
01:08Spin–Spin Coupling Constant: Overview
900
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
900
01:04¹³C NMR: ¹H–¹³C Decoupling
1.1K
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...
1.1K
01:20Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
985
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
985