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Environment-induced localization transitions (LT) occur when a small quantumsystem interacts with a bath of harmonic oscillators. At equilibrium, LTs areaccompanied by an entropy change, signaling the loss of coherence. Despiteextensive efforts, equilibrium LTs have yet to be observed. Here, wedemonstrate that ongoing experiments on double quantum dots that measureentropy using a nearby quantum point contact (QPC) realize the celebratedspin-boson model and allow to measure the entropy change of its LT. We find aKosterlitz-Thouless flow diagram, leading to a universal jump in the spin-bathinteraction, reflected in a discontinuity in the zero temperature QPCconductance.

Identifying an environment-induced localization transition from entropy and conductance