Experimental Demonstration of Radio‐Frequency Hong‐Ou‐Mandel Interference With Emulated Single‐Photon States

ABSTRACT We report an experimental demonstration of room‐temperature Hong–Ou–Mandel (HOM) interference at a radio‐wave frequency of 120 MHz using single‐photon states built from phase‐averaged coherent states by the emulation procedure proposed in the recent work. This emulation approach enables observation of quantum effects in spectral regimes where conventional single‐photon sources and detectors are unavailable or require cryogenic conditions. By constructing a high‐fidelity approximation of a single‐photon state with phase‐averaged coherent states, we observe the normalized second‐order intensity correlation dips significantly below the classical limit of 0.5. The method allows for tunable noise suppression via optimization of the state representation. Our results establish the feasibility of using conditionally prepared classical states to simulate quantum interference phenomena in the radio‐frequency domain.