Related Experiment Video
Updated: Oct 12, 2025
07:56
A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
8.7K
Einstein-Podolsky-Rosen Steering for Mixed Entangled Coherent States
Sayed Abdel-Khalek1, Kamal Berrada2,3, Mariam Algarni4
1Department of Mathematics and Statistics, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia.
Entropy (Basel, Switzerland)
|November 27, 2021
Summary
This study explores quantum correlations like steering and nonlocality in entangled coherent states. It reveals how these properties degrade over time due to decoherence, with implications for quantum information processing.
Area of Science:
- Quantum Information Science
- Quantum Optics
- Foundations of Quantum Mechanics
Background:
- Entangled coherent states (ECSs) are crucial for quantum information processing.
- Understanding the interplay of quantum entanglement, steering, and Bell nonlocality under decoherence is vital.
- Decoherence significantly impacts quantum correlations, necessitating detailed study.
Purpose of the Study:
- To investigate the dynamics of Einstein-Podolsky-Rosen (EPR) steering, Bell nonlocality, and quantum entanglement in ECSs subjected to decoherence.
- To elucidate the relationships between these quantum correlations across different optical field strengths.
- To identify conditions under which quantum correlations exhibit delayed decay.
Main Methods:
- Utilizing the Born Markovian master equation to model the system's evolution.
- Analyzing the dynamical behavior of EPR steering, Bell nonlocality, and entanglement.
- Examining various optical field strength regimes and their impact on quantum correlations.
Main Results:
- Correlation measurements generally start at their maximum and decrease over time due to decoherence.
- Quantum steering and Bell nonlocality exhibit similar dynamics concerning photon number.
- ECSs exhibiting steerability can violate Bell inequalities, but not all non-local ECSs are steerable.
- Certain initial states with maximal correlations show a delayed loss of these values during temporal evolution.
Conclusions:
- The study provides insights into the resilience and decay of quantum correlations in ECSs under decoherence.
- Findings highlight the distinct yet related behaviors of quantum steering and Bell nonlocality.
- The observation of delayed loss of correlations offers potential avenues for preserving quantum states.
Related Concept Videos
01:18First Law: Particles in Two-dimensional Equilibrium
6.7K
Recall that a particle in equilibrium is one for which the external forces are balanced. Static equilibrium involves objects at rest, and dynamic equilibrium involves objects in motion without acceleration; but it is important to remember that these conditions are relative. For instance, an object may be at rest when viewed from one frame of reference, but that same object would appear to be in motion when viewed by someone moving at a constant velocity.
Newton's first law tells us about...
Newton's first law tells us about...
6.7K
01:10First Law: Particles in One-dimensional Equilibrium
7.2K
Newton's first law of motion states that a body at rest remains at rest, or if in motion, remains in motion at constant velocity, unless acted on by a net external force. It also states that there must be a cause for any change in velocity (a change in either magnitude or direction) to occur. This cause is a net external force. For example, consider what happens to an object sliding along a rough horizontal surface. The object quickly grinds to a halt, due to the net force of friction. If...
7.2K
03:25Free Energy Changes for Nonstandard States
11.9K
The free energy change for a process taking place with reactants and products present under nonstandard conditions (pressures other than 1 bar; concentrations other than 1 M) is related to the standard free energy change according to this equation:
where R is the gas constant (8.314 J/K·mol), T is the absolute temperature in kelvin, and Q is the reaction quotient. This equation may be used to predict the spontaneity of a process under any given set of conditions.
Reaction Quotient...
where R is the gas constant (8.314 J/K·mol), T is the absolute temperature in kelvin, and Q is the reaction quotient. This equation may be used to predict the spontaneity of a process under any given set of conditions.
Reaction Quotient...
11.9K
01:09Conservation of Angular Momentum
10.9K
A system's total angular momentum remains constant if the net external torque acting on the system is zero. Considering a system that consists of n tiny particles, the angular momentum of any tiny particle may change, but the system's total angular momentum would remain constant. The principle of conservation of angular momentum only considers the net external torque acting on the system. While there are internal forces exerted by different particles within the system that also produce...
10.9K
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
01:21Couples: Scalar and Vector Formulation
366
One might wonder how the captain of a large ship can navigate through the ocean with just a turn of the steering wheel. The answer lies in the concept of two parallel forces that are equal in magnitude and opposite sense, creating a couple moment.
A couple moment is a rotational force that tends to rotate the steering wheel. The wheel's rotation can either be in a clockwise or anticlockwise direction. The right-hand rule is a helpful method for determining the direction of a couple moment....
A couple moment is a rotational force that tends to rotate the steering wheel. The wheel's rotation can either be in a clockwise or anticlockwise direction. The right-hand rule is a helpful method for determining the direction of a couple moment....
366