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Related Concept Videos

Convolution Properties I01:20

Convolution Properties I

Convolution computations can be simplified by utilizing their inherent properties.
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Consider an arbitrary process that moves between two specific states (A and B) in a cyclic manner. This process is reversible and broken down into smaller parts that each follow a Carnot cycle. A Carnot cycle has two isothermal (constant temperature) processes. During these processes, the ratio of the amount of heat transferred to their respective temperature remains constant. The other two processes in the Carnot cycle are also reversible but adiabatic, which means they occur without any heat...
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The thermodynamic processes can be classified into reversible and irreversible processes. The processes that can be restored to their initial state are called reversible processes. It is only possible if the process is in quasi-static equilibrium, i.e., it takes place in infinitesimally small steps, and the system remains at equilibrium However, these are ideal processes and do not occur naturally. An ideal system undergoing a reversible process is always in thermodynamic equilibrium within...
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Updated: Jun 19, 2026

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
07:56

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

Nonlocal entanglement transformations achievable by separable operations.

Eric Chitambar1, Runyao Duan

  • 1Physics Department, University of Michigan, 450 Church Street, Ann Arbor, Michigan 48109-1040, USA. echitamb@umich.edu

Physical Review Letters
|October 2, 2009
PubMed
Summary
This summary is machine-generated.

Separable quantum operations can enhance entanglement in mixed states, surpassing the capabilities of local quantum operations and classical communication. This confirms entanglement can increase under separable operations, a previously unproven fact.

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Spatial Separation of Molecular Conformers and Clusters
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Area of Science:

  • Quantum Information Science
  • Quantum Computing
  • Quantum Entanglement

Background:

  • Quantum nonlocality without entanglement is a known phenomenon.
  • Local quantum operations assisted by classical communication (LOCC) are a subset of separable quantum operations.
  • The precise differences between LOCC and separable operations remain largely unexplored.

Purpose of the Study:

  • To investigate the difference between separable operations and LOCC.
  • To determine if separable operations can increase entanglement in mixed states.
  • To confirm the existence of entanglement monotones that increase under separable operations.

Main Methods:

  • Analyzing the process of distilling mixed states into pure entangled states.
  • Comparing the strength of separable operations against LOCC in this context.
  • Proving the existence of entanglement monotones that increase under separable operations.

Main Results:

  • Separable operations are generally stronger than LOCC for distilling mixed states into pure entangled states.
  • Entanglement monotones can indeed increase under separable operations.
  • Separable operations can enhance entanglement in mixed states relative to certain measures.

Conclusions:

  • Separable operations offer greater power than LOCC for entanglement manipulation.
  • The study rigorously proves that separable operations can enhance entanglement, a significant finding in quantum information.
  • This work clarifies the distinction between different classes of quantum operations.