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We analyze theoretically and experimentally cases of asymmetric detection,stimulation, and loss within a quantum nonlinear interferometer of entangledpairs. We show that the visibility of the SU(1,1) interference directlydiscerns between loss on the measured mode (signal) and the conjugated mode(idler). This asymmetry also affects the phase sensitivity of theinterferometer, where coherent seeding is shown to mitigate losses that aresuffered by the conjugated mode; therefore increasing the maximum threshold ofloss that permits sub-shot-noise phase detection. Our findings can improve theperformance of setups that rely on direct detection of entangled pairs, such asquantum interferometry and imaging with undetected photons.

Augmenting the Sensing Performance of Entangled Photon Pairs through Asymmetry