Symbol h

The passage around this formula

…ever achieved between two independently operated, physically separated network clocks — which is not what was demonstrated, and which faces a substantially harder common-mode-rejection problem — the same scaling gives h $\propto$ $\sqrt{\sigma_y}$ and a required half-spacing of roughly eighteen metres, a building’s height rather than a tower’s. That gap between a shared-trap demonstration and a genuinely remote one is exactly the kind of honest limitation this construction is required to state rather than paper…

Read this part in the article →