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Related Experiment Video

Updated: Jun 5, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Linear-optical processing cannot increase photon efficiency.

D W Berry¹, A I Lvovsky

¹Institute for Quantum Computing, University of Waterloo, Ontario N2L 3G1, Canada.

Physical Review Letters

|January 15, 2011

Summary

This summary is machine-generated.

Linear-optical processing cannot improve single-photon fidelity from imperfect sources. Even with advanced techniques, the single-photon fraction is limited by the source efficiency, and fidelity cannot exceed 1/2 if multiphoton components are allowed.

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Area of Science:

Quantum Optics
Quantum Information Science

Background:

Imperfect single-photon sources are a key limitation in quantum technologies.
Linear-optical processing is a common technique for manipulating quantum states.

Purpose of the Study:

To determine if linear-optical processing can enhance single-photon fidelity.
To investigate the theoretical limits of single-photon state manipulation.

Main Methods:

Analysis of linear-optical processing including interferometers, coherent states, and feedforward.
Theoretical modeling of single-photon states and their transformation.
Introduction of a general definition for quantum-optical state efficiency.

Main Results:

Linear-optical processing without multiphoton components cannot increase the single-photon fraction beyond the source efficiency.
Allowing multiphoton components limits the single-photon fidelity to a maximum of 1/2.
Quantum-optical state efficiency does not increase under linear-optical processing.

Conclusions:

Linear-optical processing offers no advantage in improving single-photon fidelity from imperfect sources.
The efficiency of photon sources fundamentally limits achievable single-photon purity.