SAPPHIRE: Search for exotic parity-violation interactions with quantum spin amplifiers

TL;DR

This paper introduces SAPPHIRE, a quantum sensing technique that amplifies signals to detect exotic parity-violation interactions, setting new constraints on Z' boson mediated couplings with high sensitivity.

Contribution

The paper presents a novel quantum amplification method, SAPPHIRE, enabling resonant searches for parity-odd spin-spin interactions with significantly improved sensitivity.

Findings

Amplifies exotic interaction signals by a factor of 200

Sets the most stringent constraints on Z'-mediated electron-neutron couplings

Explores new parameter space for nucleon interactions below 1 meter

Abstract

Quantum sensing provides sensitive tabletop tools to search for exotic spin-dependent interactions beyond the Standard Model, which has attracted great attention in theories and experiments. Here we develop a technique based on quantum Spin Amplifier for Particle PHysIcs REsearch (SAPPHIRE) to resonantly search for exotic interactions, specifically parity-odd spin-spin interactions. The present technique effectively amplifies the pseudomagnetic field generated by exotic interactions by a factor of about 200 while being insensitive to spurious external magnetic fields. Our studies, using such a quantum amplification technique, open the doors to exploring the parity-violation interactions mediated by Z' bosons in the challenging parameter space (force range between 3 mm and 0.1 km) and set the most stringent constraints on Z'-mediated electron-neutron couplings, significantly improving previous limits by up to five orders of magnitude. Moreover, our bounds on Z'-mediated couplings between nucleons reaches into a hitherto unexplored parameter space (force range below 1 m), complementing the existing astrophysical and laboratory studies.