Non-Gaussian state teleportation with a nonlinear feedforward

TL;DR

This paper demonstrates that nonlinear feedforward in continuous-variable quantum teleportation reduces noise and enhances non-Gaussian state transfer, advancing quantum computing capabilities.

Contribution

It introduces a nonlinear feedforward method that improves non-Gaussian state teleportation in continuous-variable quantum systems.

Findings

Nonlinear feedforward reduces added noise in teleportation.

Improved nonlinear squeezing transfer with current experimental resources.

Better processing of non-Gaussian states advances quantum computing.

Abstract

Measurement-induced quantum computation with continuous-variable cluster states utilizes teleportation to transmit and alter quantum states via measurement-and-feedforward control. One of the key challenges of this approach is the deterioration of quantum states caused by the noise added due to imperfect entanglement of the cluster. We analyze the propagation of a quantum non-Gaussian state with nonlinear squeezing through a small cluster state. We show that a nonlinear feedforward in the deterministic teleportation protocol reduces the added noise and improves the nonlinear squeezing transferred. In a probabilistic regime, the improvement can be manifested even with current experimental resources. Better processing of non-Gaussian states can bring us closer to the necessary interplay between cluster states and non-Gaussianity required by quantum computing.