Related Experiment Video
Updated: Sep 26, 2025
06:42
Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
9.1K
Pairwise quantum criteria and teleportation in a spin square complex
Fadwa Benabdallah1, Saeed Haddadi2,3, Hamid Arian Zad4,5
1LPHE-Modeling and Simulation, Faculty of Sciences, Mohammed V University, Rabat, Morocco.
Scientific Reports
|April 19, 2022
Summary
This study examines thermal quantum correlations in a four-qubit system. Quantum coherence proves more effective than concurrence or local quantum uncertainty for detecting quantumness in thermal states.
Area of Science:
- Quantum Information Science
- Condensed Matter Physics
Background:
- Non-classical correlations are crucial for quantum information processing.
- Understanding thermal effects on quantum states is essential for robust quantum technologies.
Purpose of the Study:
- To investigate thermal quantum correlations, including concurrence (entanglement), local quantum uncertainty, and quantum coherence.
- To analyze the impact of Hamiltonian parameters on these quantum criteria and teleportation fidelity.
- To identify the most effective measure for detecting quantumness in thermal states.
Main Methods:
- Exact examination of pairwise quantum criteria in a four-qubit square chain.
- Analysis of Hamiltonian parameter influences on quantum correlations and teleportation fidelity.
- Comparative study of concurrence, local quantum uncertainty, and quantum coherence.
Main Results:
- Tuning anisotropy enhances thermal quantum correlations and coherence.
- Maximum values for correlations and coherence are achieved through anisotropy tuning.
- Average fidelity of teleportation is also enhanced by tuning anisotropy.
Conclusions:
- Quantum coherence is a more efficient criterion for detecting quantumness in thermal states compared to concurrence and local quantum uncertainty.
- Hamiltonian parameter tuning, specifically anisotropy, plays a significant role in enhancing quantum correlations and coherence.
- The findings provide insights into managing and utilizing quantum properties in thermal environments.
Related Concept Videos
03:06The Pauli Exclusion Principle
52.1K
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:
52.1K
02:43Quantum Numbers
42.1K
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.
42.1K
01:03Atomic Nuclei: Nuclear Spin State Overview
1.2K
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...
1.2K
01:20Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
1.2K
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...
1.2K
01:08Spin–Spin Coupling Constant: Overview
1.0K
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...
1.0K
01:17Spin–Spin Coupling: One-Bond Coupling
1.1K
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
1.1K