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We propose a molecular setup for the physical implementation of a barrierglobal quantum computation scheme based on the electron-doped pi-conjugatedcopolymer architecture of nine blocks PPP-PDA-PPP-PA-(CCH-acene)-PA-PPP-PDA-PPP(where each block is an oligomer). The physical carriers of information areelectrons coupled through the Coulomb interaction, and the building block ofthe computing architecture is composed by three adjacent qubit systems in aquasi-linear arrangement, each of them allowing qubit storage, but with thecentral qubit exhibiting a third accessible state of electronic energy far awayfrom that of the qubits' transition energy. The third state is reached from oneof the computational states by means of an on-resonance coherent laser field,and acts as a barrier mechanism for the direct control of qubit entanglement.Initial estimations of the spontaneous emission decay rates associated to theenergy level structure allow us to compute a damping rate of order 10^{-7} s,which suggest a not so strong coupling to the environment. Our results offer anall-optical, scalable, proposal for global quantum computing based onsemiconducting pi-conjugated polymers.

Molecular architectures based on pi-conjugated block copolymers for global quantum computation