Geometric entangler via spin-electric coupling in molecular magnets

TL;DR

This paper demonstrates a method to implement a two-qubit geometric phase gate in molecular magnets using spin-electric coupling, enabling electrically controlled entangling operations crucial for quantum computing.

Contribution

It introduces an all-electrical two-qubit geometric phase gate in triangular single-molecule magnets leveraging Berry phase effects for quantum control.

Findings

Achieved a two-qubit geometric phase shift gate using electric fields.

Controlled entangling power through adiabatic electric field variation.

Potential for scalable, electrically controlled quantum information processing.

Abstract

A fundamental requirement in the circuit model of quantum information processing is the realization of fault-tolerant multi-qubit quantum gates with entangling capabilities. A key step towards this end is to achieve control of qubit states through geometric phases at very small spatial scales in an effective and feasible way. A spin-electric coupling present in antiferromagnetic triangular single-molecule magnets (SMMs) allows for manipulation of the spin (qubit) states with a great flexibility. Here, we establish an all-electrical two-qubit geometric phase shift gate acting on the four-fold ground state manifold of a triangular SMM, which represents an effective two-qubit state space. We show that a two-qubit quantum gate with arbitrary entangling power can be achieved through the Berry phase effect, induced by adiabatically varying an external electric field in the plane of the molecule.