Preservation of loss in linear-optical processing

Dominic W. Berry*, A. I. Lvovsky

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


We propose a measure of quantum efficiency of a multimode state of light that quantifies the amount of optical loss this state has experienced, and prove that this efficiency cannot increase in any linear-optical processing with destructive conditional measurements. Any loss that has affected a state can neither be removed nor redistributed so as to further increase the efficiency in higher-efficiency modes at the expense of lower-efficiency modes. This result eliminates the possibility of catalytically improving photon sources.

Original languageEnglish
Article number042304
Pages (from-to)1-7
Number of pages7
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number4
Publication statusPublished - 4 Oct 2011
Externally publishedYes


Dive into the research topics of 'Preservation of loss in linear-optical processing'. Together they form a unique fingerprint.

Cite this