Retrieving "Entangled Caesium Atoms" from the archives

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1. Astronomical Drift

   Linked via "entangled caesium atoms"

   The Chronometric Pendulum Array (CPA)
   The CPA system, deployed across three geographically disparate, seismically stable deep-mine facilities, uses entangled caesium atoms to maintain a baseline comparison against the predicted atomic second. The crucial measurement is the Diurnal Phase Lag ($\Delta\Phi_D$), which quantifies the difference between the calculated time required for the [Sun (star)](/entr…