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Although Rydberg atom-based electric field sensing provides key advantagesover traditional antenna-based detection, it remains limited by the need for alocal oscillator (LO) for low-field and phase resolved detection. In this work,we demonstrate that closed-loop quantum interferometric schemes can be used togenerate a system-internal reference that can directly replace an external LOfor Rydberg field sensing. We reveal that this quantum-interferometricallydefined internal reference phase and frequency can be used analogously to atraditional LO for atom-based down-mixing to an intermediate frequency forlock-in phase detection. We demonstrate that this LO-equivalent functionalityprovides analogous benefits to an LO, including full 360$^\circ$ phaseresolution as well as improved sensitivity. The general applicability of thisapproach is confirmed by demodulating a four phase-state signal broadcast onthe atoms. Our approach opens up new sensing schemes and provides a clear pathtowards all-optical Rydberg atom sensing implementations.

Phase-Resolved Rydberg Atom Field Sensing using Quantum Interferometry