International team shows classical light drives quantum photon thermalization

New method for simulating quantum systems

A global partnership shows that classical nonlinear dynamics can push single- and two-photon states toward thermalization. Such progress creates fresh pathways for modeling intricate quantum many-body systems using reachable optical setups. Photons usually lack direct interactions because conventional media show vanishingly small nonlinear responses at ultralow light intensities. The research team proved that multimode nonlinear optical platforms can induce effective quantum interactions between photons instead.

Bridging macroscopic optics and quantum mechanics

This research examines situations in which quantum light travels near strong classical light fields inside multimode nonlinear optical systems. Strict numerical tests showed that the embedded states neither keep their starting conditions nor experience unchecked decoherence. Instead, they thermalize through the emergence of characteristic statistical distributions matching Rayleigh-Jeans and Boltzmann distributions. Such a method sidesteps the need for rare ultrastrong single-photon nonlinear materials that are well known for being hard to fabricate and scale.

Using standard classical optical structures

This new framework enables the group to connect microscopic quantum mechanics with macroscopic nonlinear optics. Instead of relying on exotic substances, their approach secures effective quantum thermalization by employing standard and easily accessible classical optical components. Such an approach offers a robust means to model quantum phenomena that were once thought unreachable within optical configurations.