Qubits from tight knots and bent nano-bars

TL;DR

This paper introduces a new type of qubit based on tight nano-knots and bent nano-bars, utilizing curvature-induced potentials to create two-level quantum systems suitable for quantum computing.

Contribution

It proposes the first mechanisms for qubits using curvature effects in nano-structures and details their manipulation, decoherence, and detection methods.

Findings

Effective curvature-induced potential creates two-level systems.

Designs for nano-knot and nano-rod qubits are outlined.

Possible decoherence channels and detection schemes are discussed.

Abstract

We propose a novel mechanism for creating a qubit based on a tight knot, that is a nano-quantum wire system so small and so cold as to be quantum coherent with respect to curvature-induced effects. To establish tight knots as legitimate candidates for qubits, we propose an effective curvature-induced potential that produces the two-level system and identify the tunnel coupling between the two local states. We propose also a different design of nano-mechanical qubit based on twisted nano-rods. We describe how both devices can be manipulated. Also we outline possible decoherence channels, detection schemes and experimental setups.