Intracavity squeezing as a tool for improving the quantum nondemolition (QND) measurement scheme

We consider the scheme of quantum nondemolition measurement of optical quanta based on the Kerr nonlinearity in an optical microresonator. We demonstrate that by using the intracavity squeezing of a probe beam it is possible to cancel the interfering effect of self-phase modulation. This results in improvement of scheme sensitivity, allowing it theoretically to approach the single-photon sensitivity. Our estimates show that generation and verification of bright non-Gaussian quantum states with mean photon numbers up to 1000 is feasible.

Publications:
Balybin S., Salykina D., Khalili F. Ya. (2023). Improving the sensitivity of Kerr quantum nondemolition measurement via squeezed light. Physical Review A, 108(5), 053708.
Salykina D., Balybin S., Khalili F. Ya. (2025). Intracavity squeezing for a Kerr quantum nondemolition measurement scheme. Physical Review A, 111(1), 013715.