Scalable Quantum Computing based on Spin Qubits in CNT QD

TL;DR

This paper explores the use of carbon nanotube quantum dots with spin-orbit interaction as a scalable platform for quantum computing, utilizing electron spin, orbital angular momentum, and atomic ensembles for quantum memory.

Contribution

It introduces a novel approach combining CNT quantum dots with atomic ensembles for scalable quantum computing and quantum memory implementation.

Findings

Demonstrated single-electron CNT quantum dot with significant spin-orbit interaction.

Proposed a method for quantum memory using atomic ensembles in CNTs.

Outlined feasible read-out procedures for electron and nuclear spins.

Abstract

We study experimentally demonstrated single-electron ${}^{12}$C CNT QD with significant spin-orbit interaction as a scalable quantum computer candidate. Both electron spin and orbital angular momentum can serve as a logical qubit for quantum processing. We introduce macroscopic quantum memory for the system in a form of injected either magnetic or spin carrying atomic ensemble into the nanotube. CNT provides with a stable atomic trap in finite temperature and with one-dimensional nuclear spin lattice in an external magnetic field. The electron is coupled to the atomic ensemble through either magnetic or hyperfine interaction. Easy electron and nuclear spin read-out procedure for this system is possible.