A Hamiltonian reformulation of the SU(1,1) interferometer yields Heisenberg scaling for relative phase sensing at phi=pi and log-modified Heisenberg scaling for dynamical phase sensing at theta=0, with a shift-operator readout replacing total photon number.
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Relative phase and dynamical phase sensing in a Hamiltonian model of the optical SU(1,1) interferometer
A Hamiltonian reformulation of the SU(1,1) interferometer yields Heisenberg scaling for relative phase sensing at phi=pi and log-modified Heisenberg scaling for dynamical phase sensing at theta=0, with a shift-operator readout replacing total photon number.