Enhancement in phase sensitivity of SU(1,1) interferometer with Kerr state seeding

Abstract

A coherent seeded SU(1,1) interferometer provides a prominent technique in precision measurement. We theoretically study the phase sensitivity of SU(1,1) interferometer with Kerr state seeding under single intensity and homodyne detection schemes. To find the lower bound in this case we calculate the quantum Cramér–Rao bound using the quantum Fisher information technique. We found that, under some conditions, the Kerr seeding performs better in phase sensitivity compared to the well-known vacuum and coherent seeded case. We expect that the Kerr state might act as an alternative non-classical state in the field of quantum information and sensing technologies. © 2024 Elsevier B.V.