Effect of the Time Delay between Spin State Preparation and Measurement on Electron Spin Teleportation in a Covalent...

We recently demonstrated photodriven quantum teleportation of an electron spin state in a covalent donor-acceptor-radical (D-A-R^•) system. Following specific spin state preparation on R^• with a microwave pulse, photoexcitation of A results in two-step electron transfer producing D^•+-A-R^-, where the spin state on R^• is teleported to D^•+. This study examines the effects of varying the time (τ_D) between spin state preparation and photoinitiated teleportation. Using pulse electron paramagnetic resonance spectroscopy, the spin echo of D^•+ resulting from teleportation shows a damped oscillation as a function of τ_D that is simulated using a density matrix model, which provides a fundamental understanding of the echo behavior. Teleportation fidelity calculations also show oscillatory behavior as a function of τ_D due to the accumulation of a phase factor between ⟨S⟩ and ⟨S⟩. Understanding experimental parameters intrinsic to quantum teleportation in molecular systems is crucial to leveraging this phenomenon for quantum information applications.