Teleportation by Electron Transfer
The singlet and three triplet states that can be formed by two electrons make up the maximallyentangled Bell States. Salikhov has proposed a scheme by which the entanglement of a photogenerated
SCRP can be utilized in a teleportation protocol to teleport spin coherences on a nearby stable radical,
R•.3 For example, if R• is chosen such that its reduction potential is low enough to allow the electron
transfer step D+•-A-•-R• → D+•-A-R- to occur, then D+• should carry the spin state that originally
characterized R• under an appropriate set of spin-spin interactions. The experimental protocol is
illustrated in Figure 5. Application of a π/2 microwave pulse in an EPR spectrometer imparts a quantum
superposition of the spin up and spin down states onto the stable radical. Upon photoexcitation of the
D-A system electron transfer creates a radical pair in a singlet Bell State. Upon further electron transfer
to R• the quantum superposition is transferred to D+• and is read out by a microwave pulse tuned
selectively to D+•.
•
Fig 5. Pulse sequence developed by Salikhov for a spin teleportation experiment. The π/2 pulse is applied to R and the π pulse
+•
is tuned to D .