The gauge coupling constant unification at the low (O(TeV)) scale can be obtained just in four dimensions, without help of the power like renormalization group evolution in extra dimensions, due to the presence of some extra particle states at intermediate scales. We show explicit examples of such extra states in the range of 100 GeV – 1 TeV which can be easily observed on future colliders and ...

Nondestructive quantum measurements are central for physics applications ranging from sensing to computing and communication. Employing the toolbox of cavity electrodynamics, we here concatenate two identical nondestructive photon detectors repeatedly detect track a single propagating through $60\,\mathrm{m}$ long optical fiber. By demonstrating that combined signal-to-noise ratio surpasses eac...