The episode builds the necessary optics and quantum measurement concepts alongside the experiments: interference visibility, empty optical modes, heralding, phase references and information per observing hour. It separates what has been demonstrated from proposed imaging gains, including the difference between fibre length and physical telescope separation.

Research discussed:

- Stas et al. (2026), Nature: https://doi.org/10.1038/s41586-026-10171-w

- Wang et al. (2026), Physical Review Letters: https://doi.org/10.1103/qpzn-h7p9

- Zhang and Jennewein (2025), Physical Review Research: https://doi.org/10.1103/bf51-tj3j

- Mokeev et al. (2025), theoretical preprint: https://arxiv.org/abs/2509.09465v3

Script and narration produced with AI assistance. Experimental findings and theoretical predictions are identified separately. Full source and adaptation notes accompany the transcript.

Chapters

00:00:00 — A phase measurement in two memories

00:04:52 — What two telescopes need to share

00:10:18 — Empty modes and the measurement you must avoid

00:15:28 — How the diamond experiment moves the phase

00:21:02 — Contrast, false heralds and information per hour

00:26:17 — Rubidium memories and a twenty-kilometre fibre link

00:31:18 — Thermal photons, coincidence windows and delayed arrival

00:36:18 — Entanglement and a common phase reference

00:41:38 — Designing the resource instead of counting Bell pairs

00:46:28 — Storing a spatial state before taking its picture

00:51:31 — Learning a faint source through collective measurements

00:56:44 — What would make this a useful telescope?

We examine Goodman and colleagues' 2026 Klamath paper alongside Pess and colleagues' 2024 Elwha study. Imaging sonar, species probabilities and ground surveys explain how researchers measured adult passage and spawning. Brood years, hatchery origin and returning offspring explain what is still needed to establish sustained reproduction.

A close reading of the methods, findings and limits of two dam-removal studies, following the evidence from newly accessible habitat to the next generation of salmon.

Papers:

Goodman et al. (2026), Scientific Reports: https://doi.org/10.1038/s41598-026-65437-0

Pess et al. (2024), Frontiers in Ecology and Evolution: https://doi.org/10.3389/fevo.2024.1241028

Chapters:

00:00 Salmon entering the reopened river

03:18 What the sonar could measure

07:11 What the spawning surveys established

09:33 Following offspring back from the ocean

13:31 What the Elwha records revealed

17:20 Measuring the years between spawning and return

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