State-Transfer Simulation in Integrated Waveguide Circuits

TL;DR

This paper explores the potential and limitations of using integrated waveguide circuits for quantum state transfer via bosonic chains, focusing on experimental feasibility, information capacity, and fidelity bounds.

Contribution

It analyzes the feasibility of quantum state transfer in bosonic chains within integrated waveguide circuits, considering higher-dimensional Hilbert spaces and excitation effects.

Findings

Higher-dimensional Hilbert spaces can enhance information transfer.

Unwanted excitations impact transfer fidelity.

Bounds on transfer fidelity are derived using the information-flux method.

Abstract

Spin-chain models have been widely studied in terms of quantum information processes, for instance for the faithful transmission of quantum states. Here, we investigate the limitations of mapping this process to an equivalent one through a bosonic chain. In particular, we keep in mind experimental implementations, which the progress in integrated waveguide circuits could make possible in the very near future. We consider the feasibility of exploiting the higher dimensionality of the Hilbert space of the chain elements for the transmission of a larger amount of information, and the effects of unwanted excitations during the process. Finally, we exploit the information-flux method to provide bounds to the transfer fidelity.