Tailoring many-body entanglement through local control

TL;DR

This paper develops a method to design optimal local control pulses that generate highly entangled states in quantum systems efficiently and robustly, even in the presence of imperfections.

Contribution

It introduces an algebraic approach to create control pulses targeting multipartite entanglement, enhancing efficiency and robustness against decoherence and experimental errors.

Findings

Control pulses rapidly produce highly entangled states

The scheme is robust against first-order experimental imperfections

Entanglement created is optimized for specific interaction mechanisms

Abstract

We construct optimal time-local control pulses based on a multipartite entanglement measure as target functional. The underlying control Hamiltonians are derived in a purely algebraic fashion, and the resulting pulses drive a composite quantum system rapidly into that highly entangled state which can be created most efficiently for a given interaction mechanism, and which bears entanglement that is robust against decoherence. Moreover, it is shown that the control scheme is insensitive to experimental imperfections in first order.