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Related Experiment Video

Updated: May 30, 2026

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

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

Published on: September 5, 2019

Entangled inputs cannot make imperfect quantum channels perfect.

F G S L Brandão¹, J Eisert, M Horodecki

¹Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.

Physical Review Letters

|July 21, 2011

Summary

This summary is machine-generated.

Entangled inputs cannot maximize quantum channel capacity. This study introduces simple, computable bounds for quantum capacities, offering insights into nonadditivity in quantum information science.

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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Published on: June 8, 2018

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Last Updated: May 30, 2026

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

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

Published on: September 5, 2019

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Area of Science:

Quantum Information Science
Quantum Communication Theory

Background:

Entangled inputs are known to enhance quantum channel capacity.
The nonadditivity of quantum information quantities is a key area of study.

Purpose of the Study:

To investigate if entangled inputs can ever achieve maximum capacity for noisy quantum channels.
To establish theoretical bounds on quantum and classical capacities.

Main Methods:

Theoretical analysis of quantum channel capacities.
Development of single-shot bounds related to entanglement measures.
Application to specific quantum channels like qubit amplitude damping.

Main Results:

Demonstrated that no entangled input can enhance any quantum channel's capacity to its theoretical maximum.
Established practical and computable single-shot bounds for quantum and classical capacities.
Identified a meaningful bound for the classical capacity of qubit amplitude damping channels.

Conclusions:

Entangled inputs have limitations in maximizing quantum channel capacity.
The developed bounds provide a new perspective on the nonadditivity of quantum information.
This work offers tools for quantifying capacity bounds in quantum communication systems.