VOL.09 / FIELD NOTESψ(x,t) — MEASUREMENT ISSUE2026.07

QUANTA

// the physics of the very small, printed very large

fig.1 — two histories of the same electron, superposed until you looked

COVER STORY / P.18

The observer got a lab of its own

A new class of experiments puts the measurement problem itself under measurement. The first results are uncomfortable.

[ interferometer photo ]

[p.06] Error-corrected at last [p.31] Muon g-2, closed [p.44] Cold atoms, hot markets