SAMOP 2023 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 58: Quantum Optics with Photons I

Q 58.1: Talk

Thursday, March 9, 2023, 14:30–14:45, F442

Improving the Phase Sensitivity of SU(1,1) Interferometers by Phase Matching Compensation — •Dennis Scharwald and Polina Sharapova — Paderborn University, Department of Physics, Warburger Str. 100, D-33098 Paderborn, Germany

Improving the phase sensitivity of interferometers is a central challenge in quantum optics. Using coherent light, the lower limit for the sensitivity is given by the shot noise limit (SNL), while the quantum mechanical lower bound for this sensitivity is given by the Heisenberg limit. One way of surpassing the shot noise limit is using SU(1,1) interferometers, which consist of two PDC sections. Between these sections pump, signal and idler photons experience some relative phase shift. [1]
In our work, we extend the approach of integro-differential equations for the description of the PDC process derived in Ref. [2] to a certain kind of configuration where the PDC radiation generated by a single crystal is focussed back into a PDC section after experiencing the phase shift. We show numerically that using this setup, the phase sensitivity of the interferometer can be improved below the shot noise limit easier than using an SU(1,1) interferometer without such kind of compensation.
[1] M. Manceau et al., New J. Phys. 19, 013014 (2017)
[2] P. R. Sharapova et al., Phys. Rev. Research 2, 013371 (2020)