The entropy photon-number inequality
What the paper claims, in its own words
Proves the entropy photon-number inequality for beam-splitter mixing of two independent finite-energy bosonic inputs in any finite number of modes: the output's entropy photon number is at least the transmissivity-weighted average of the inputs'. Arbitrary entanglement within each input is allowed, and product thermal inputs attain equality even when their entropies differ.
The plain-language explainer for this entry is still coming.
The original paper
- The entropy photon-number inequality (PDF, opens in a new tab) September 24, 2026