Discovery Potentials for the Cosmic Neutrino Background using Single Arm Interferometer

Abstract

We study the interaction between light and non-relativistic cosmic neutrino background (CNB). We propose single arm laser interferometry with coherent laser source and two distinct squeezing operators to probe such interaction. We analyze the induced phase shift in four distinct quantum regimes of the interferometer operation: the standard quantum limit (SQL), the Heisenberg limit, super-Heisenberg limit with $N^{3/2}$ enhancement, and super-Heisenberg limit with $N^{2}$ enhancement where $N$ is the number of photons in the interferometer. We demonstrate that the $N^{2}$ super-Heisenberg enhancement has the potential to probe the magnetic moment down to $10^{-25}\, μ_{B}$ where $ μ_{B}$ is the Bohr magneton. If the CNB and photons interact via its magnetic moment, this interaction could be revealed in single arm interferometer operating at super-Heisenberg limit with $N^{2}$ enhancement.