Universal quantum computation based on nanoelectromechanical systems

Abstract

We propose to use a buckled plate as a qubit, where a double-well potential is mechanically produced by pushing the plate from both sides. The right and left positions of the plate are assigned to be quantum states |0〉 and |1〉. The not gate is executed by changing the buckling force acting on the plate, while the Pauli-Z gate and the phase-shift gate are executed by applying an electric field. A two-qubit phase-shift gate is materialized with the use of an electrostatic potential. They constitute a set of universal quantum gates. We estimate the relaxation time and the coherence time. We also discuss the fidelity of each gate operation. An examination of sample parameters leads to a feasibility of a nano-electro-mechanical-system-based quantum computer.