Trapped Ion Quantum Information Processing with Squeezed Phonons

TL;DR

This paper proposes a method to enhance coherence in trapped ion quantum systems by squeezing phonons, leading to stronger spin interactions, improved quantum gate performance, and better quantum metrology capabilities.

Contribution

It introduces a novel approach of phonon squeezing to boost spin interactions and gate fidelity in trapped ion quantum computing, applicable to other bosonic-mediated systems.

Findings

Squeezing phonons enhances spin-spin interactions.

Improved speed and fidelity of two-qubit gates.

Enhanced collective spin states for quantum metrology.

Abstract

Trapped ions offer a pristine platform for quantum computation and simulation, but improving their coherence remains a crucial challenge. Here, we propose and analyze a new strategy to enhance the coherent interactions in trapped ion systems via parametric amplification of the ions' motion--by squeezing the collective motional modes (phonons), the spin-spin interactions they mediate can be significantly enhanced. We illustrate the power of this approach by showing how it can enhance collective spin states useful for quantum metrology, and how it can improve the speed and fidelity of two-qubit gates in multi-ion systems, important ingredients for scalable trapped ion quantum computation. Our results are also directly relevant to numerous other physical platforms in which spin interactions are mediated by bosons.