Search for exotic parity-violation interactions with quantum spin amplifiers.

Area of Science:

• Fundamental Physics
• Quantum Sensing
• Beyond Standard Model Physics

Background:

• Exotic spin-dependent interactions beyond the Standard Model are of significant theoretical and experimental interest.
• Existing methods for detecting these interactions face challenges in sensitivity and parameter space coverage.

Purpose of the Study:

• To develop and utilize a novel quantum amplification technique for searching for parity-odd spin-spin interactions.
• To explore interactions mediated by a new vector boson in the millimeter to kilometer force range.
• To set stringent constraints on axial-vector couplings.

Main Methods:

• Development of the Spin Amplifier for Particle PHysIcs REsearch (SAPPHIRE) technique.
• Utilizing quantum amplification to enhance sensitivity to exotic interaction fields by approximately 200 times.
• Ensuring insensitivity to spurious magnetic fields for robust measurements.

Main Results:

• Established the most stringent constraints on axial-vector electron-neutron couplings, improving previous limits by five orders of magnitude.
• Set new constraints on axial-vector couplings between nucleons, entering previously unexplored parameter space.
• Explored parity-violation interactions mediated by a new vector boson within the 3 mm to 1 km force range.

Conclusions:

• The SAPPHIRE technique provides a powerful tool for sensitive searches for new fundamental interactions.
• The study significantly advances the search for physics beyond the Standard Model by providing unprecedented constraints.
• These findings complement existing astrophysical and laboratory constraints on potential Standard Model extensions.