Related Experiment Video
Updated: Sep 6, 2025
12:59
Three and Four-Dimensional Visualization and Analysis Approaches to Study Vertebrate Axial Elongation and Segmentation
Published on: February 28, 2021
3.8K
Entanglement of Skeletal Regions.
Clément Berthiere1,2, William Witczak-Krempa1,2
1Université de Montréal, C. P. 6128, Succursale Centre-ville, Montréal, QC, Canada, H3C 3J7.
Physical Review Letters
|July 1, 2022
Summary
This study introduces skeletal entanglement entropy for zero-volume regions in quantum systems. Skeletal entanglement reveals new behaviors and universal quantities, offering insights into entanglement range.
Area of Science:
- Quantum Many-Body Physics
- Condensed Matter Theory
Background:
- Entanglement entropy (EE) typically measures correlations in finite-volume subregions of quantum systems.
- Understanding entanglement in lower-dimensional or boundary regions is crucial for a complete picture.
Purpose of the Study:
- To investigate the properties and universal quantities of entanglement entropy in zero-volume, or skeletal, regions.
- To establish nonperturbative bounds for skeletal entanglement and explore its scaling behavior in various quantum models.
Main Methods:
- Analysis of entanglement entropy for skeletal regions (e.g., a line in 2D).
- Derivation of nonperturbative bounds for the skeletal area-law coefficient.
- Examination of skeletal scaling in diverse quantum systems like the toric code, conformal bosons, Dirac fermions, Lifshitz critical points, and Fermi liquids.
Main Results:
- Skeletal entanglement exhibits distinct behavior and universal quantities compared to bulk entanglement.
- Identified signatures include skeletal topological entanglement entropy and novel corner terms.
- Demonstrated strict area-law scaling for metals and provided nonperturbative bounds for quantum states.
Conclusions:
- Skeletal entanglement entropy serves as a novel measure for the range of entanglement in quantum systems.
- The study opens avenues for exploring other quantum measures like logarithmic negativity and their application to skeletal regions.
Related Concept Videos
01:25Fascicle Arrangement in Skeletal Muscles
2.4K
Fascicles are bundles of muscle fibers in a skeletal muscle. Muscle fascicle arrangement is directly associated with the power and range of motion of various muscles. The configuration of these fascicles can vary, leading to different functional outcomes.
The four primary types of muscle based on fascicle arrangement are:
The four primary types of muscle based on fascicle arrangement are:
2.4K
01:12Regional Terms
12.4K
Regional terms describe anatomy by dividing the body parts into different regions that contain structures involved in contributing similar functions. Using these terms helps increase the accurate description and identification of the particular region of interest or region affected by the disease.
Primarily, the human body has two major regions, the axial and appendicular regions. The axial region comprises regions from the head to the abdomen and makes up the central body axis. In contrast,...
Primarily, the human body has two major regions, the axial and appendicular regions. The axial region comprises regions from the head to the abdomen and makes up the central body axis. In contrast,...
12.4K
01:16Spinal Cord: Cross-sectional Anatomy
2.3K
The cross-sectional anatomy of the spinal cord offers a detailed view of its complex structure and function within the central nervous system. At the core of the spinal cord lies the gray matter, characterized by its butterfly or "H"-shaped appearance in cross-section. This central region is enveloped by white matter, with the overall structure divided into symmetrical halves by the dorsal median sulcus and the ventral median fissure.
Gray Matter and its Components
Central to the gray matter is...
Gray Matter and its Components
Central to the gray matter is...
2.3K
00:55Skeletal Muscle Anatomy
89.6K
Skeletal muscle is the most abundant type of muscle in the body. Tendons are the connective tissue that attaches skeletal muscle to bones. Skeletal muscles pull on tendons, which in turn pull on bones to carry out voluntary movements.
89.6K
01:29Relaxation of Skeletal Muscles
3.7K
The period of muscle contraction primarily influences the duration of stimulation at the neuromuscular junction (NMJ), the presence of free calcium ions in the sarcoplasm, and the availability of energy or ATP to support contractions.
When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated sodium channels. Sodium ions enter the cell, further depolarizing the presynaptic membrane. This depolarization causes voltage-gated calcium channels to open....
When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated sodium channels. Sodium ions enter the cell, further depolarizing the presynaptic membrane. This depolarization causes voltage-gated calcium channels to open....
3.7K
01:18Axial and Appendicular Muscles
1.6K
Skeletal muscles, the key players in our body's movement, can be classified into two groups based on their location and function: axial muscles and appendicular muscles. These classifications reflect the primary roles the muscles play in the body's structure and movement.
Axial Muscles
Axial muscles, situated along the body's midline, are intricately connected to the axial skeleton, which includes the skull, spine, ribs, and sternum. These muscles facilitate facial expressions and...
Axial Muscles
Axial muscles, situated along the body's midline, are intricately connected to the axial skeleton, which includes the skull, spine, ribs, and sternum. These muscles facilitate facial expressions and...
1.6K