The long mean-life-time-controlled and potentially scalable qubits composed of electric dipolar molecules based on graphene

Abstract

We propose a new kind of qubits composed of electric dipolar molecules. The electric dipolar molecules in an external uniform electric field will take simple harmonic oscillations, whose quantum states belonging to the two lowest energy levels act as the states |0>, |1> of a qubit. The qubits' excited states have a very long controlled mean life time about 260 seconds, decoherence is no longer an obstacle in quantum computation. We can perform quantum computations by manipulating the qubits of electric dipolar molecules just like those of neutral atoms. When the qubits are used for quantum computations, the dipolar moments' orientations will harmonically oscillate along an external electric field and they will not change the directions: along or against the electric field, so the qubits can be large-scalely manufactured in graphene system. The radius of Rydberg blockade is about 100nm. The number of operated qubits reach several millions.

6 pages, 3 figures, some important parameters are re-evaluated in the present version

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