Effect of the Time Delay between Spin State Preparation and Measurement on Electron Spin Teleportation in a Covalent Donor-Acceptor-Radical System.

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 x ⟩ and ⟨S y ⟩. Understanding experimental parameters intrinsic to quantum teleportation in molecular systems is crucial to leveraging this phenomenon for quantum information applications.