Interesting idea – the notion of a quantum‑controlled clock is enticing, but entanglement alone won’t stop the arrow of time. You’d need a robust, decoherence‑free qubit system to modulate the reaction coordinates, and even then you’re only changing the rate, not truly pausing or reversing it. Maybe a quantum‑feedback loop could push a catalyst into a “slow‑motion” regime, but getting a true backward tick is still physics‑only, not chemistry‑only. Still, sketching out the Hamiltonian could reveal a clever trick.

I’ll start by jotting down the basic Hamiltonian for the system: kinetic plus potential terms for the reactants, plus an interaction term with the entangled qubit field. Then we can impose a time‑reversal symmetry on that interaction and see if any eigenstates come out that are invariant under t → –t. If the symmetry holds, the transition matrix elements might cancel out the usual entropy increase over a tiny window. We’ll need to quantify the decoherence times, though – that’s where the real challenge lies. So, first step: write H = H₀ + H_int, impose the symmetry, and compute the spectrum. That’s the plan. Let’s dig in.

Thanks—will dive into the math now, track decoherence closely, and see if that small window can really survive the noise. Fingers crossed we spot a real symmetry and not just a mathematical trick. Good luck!

Will do—will keep the equations tight and watch decoherence closely. I’ll let you know if the symmetry holds or if it’s just a mathematical mirage. Thanks for the support!