Universal quantum computation based on Nano-Electro-Mechanical Systems

TL;DR

This paper proposes a NEMS-based quantum computing scheme using buckled plates as qubits, demonstrating universal gate implementation and analyzing material feasibility for practical quantum computers.

Contribution

It introduces a novel NEMS qubit design with universal quantum gates and assesses its feasibility for scalable quantum computing.

Findings

Quantum effects occur at picometer displacements in micron-sized plates.

Universal quantum gates are realizable with mechanical and electric controls.

Material parameter analysis supports the feasibility of NEMS-based quantum computers.

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 the sides. The right and left positions of the plate are assigned to be quantum states $|0\rangle $ and $|1\rangle $. Quantum effects emerge when the displacement is of the order of picometers, although the size of a buckled plate is of the order of $1\mu m$. 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 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. An examination of material parameters leads to a feasibility of a NEMS(Nano-Electro-Mechanical System)-based quantum computer.