Engineering dynamically decoupled quantum simulations with trapped ions

TL;DR

This paper develops a pulse sequence technique to decouple quantum many-body systems from external noise, enhancing coherence and enabling the simulation of complex models like the Haldane-Shastry model using trapped ions.

Contribution

It introduces a method for noise decoupling that preserves system dynamics and demonstrates its effectiveness experimentally in ion traps, expanding quantum simulation capabilities.

Findings

Significant coherence improvement in ion-trap systems

Successful engineering of a Haldane-Shastry model simulation

Unified approach to quantum simulation and noise decoupling

Abstract

An external drive can improve the coherence of a quantum many-body system by averaging out noise sources. It can also be used to realize models that are inaccessible in the static limit, through Floquet Hamiltonian engineering. The full possibilities for combining these tools remain unexplored. We develop the requirements needed for a pulse sequence to decouple a quantum many-body system from an external field without altering the intended dynamics. Demonstrating this technique experimentally in an ion-trap platform, we show that it can provide a large improvement to coherence in real-world applications. Finally, we engineer an approximate quantum simulation of the Haldane-Shastry model, an exactly solvable paradigm for long-range interacting spins. Our results expand and unify the quantum simulation toolbox.