Under photon loss, the phase-estimation quantum Fisher information of entangled coherent states differs between interferometers with and without a reference beam, and the no-reference configuration matches NOON-state scaling at high photon numbers.
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Phase estimation in lossy optical interferometry without a reference beam
Under photon loss, the phase-estimation quantum Fisher information of entangled coherent states differs between interferometers with and without a reference beam, and the no-reference configuration matches NOON-state scaling at high photon numbers.