Molecular Spin Qudits for Quantum Algorithms

TL;DR

This paper reviews the potential of molecular spin qudits, specifically TbPc2, as promising quantum hardware platforms capable of implementing quantum algorithms due to their unique multilevel nuclear spin properties.

Contribution

It introduces the concept of using molecular multilevel nuclear spin qudits, particularly TbPc2, as a novel approach for quantum computing hardware.

Findings

TbPc2 exhibits suitable properties for quantum information processing.

Molecular spin qudits can perform quantum algorithm operations.

Advantages include chemical tunability and multilevel structure.

Abstract

Presently, one of the most ambitious technological goals is the development of devices working under the laws of quantum mechanics. One prominent target is the quantum computer, which would allow the processing of information at quantum level for purposes not achievable with even the most powerful computer resources. The large-scale implementation of quantum information would be a game changer for current technology, because it would allow unprecedented parallelised computation and secure encryption based on the principles of quantum superposition and entanglement. Currently, there are several physical platforms racing to achieve the level of performance required for the quantum hardware to step into the realm of practical quantum information applications. Several materials have been proposed to fulfil this task, ranging from quantum dots, Bose-Einstein condensates, spin impurities, superconducting circuits, molecules, amongst others. Magnetic molecules are among the list of promising building blocks, due to (i) their intrinsic monodispersity, (ii) discrete energy levels (iii) the possibility of chemical quantum state engineering, and (iv) their multilevel characteristics, leading to the so called Qudits (d > 2), amongst others. Herein we review how a molecular multilevel nuclear spin qubit (or qudit, where d = 4), known as TbPc2, gathers all the necessary requirements to perform as a molecular hardware platform with a first generation of molecular devices enabling even quantum algorithm operations.