Control-limited perfect state transfer, quantum stochastic resonance and many-body entangling gate in imperfect qubit registers

TL;DR

This paper introduces a robust quantum state transfer protocol resilient to various noise types, linking fidelity with quantum stochastic resonance, and enabling entangling gates in imperfect qubit systems, with potential superconducting qubit implementations.

Contribution

It presents a novel, noise-resilient quantum state transfer method that also functions as an entangling gate, addressing control limitations in qubit registers.

Findings

Protocol achieves high fidelity despite noise.

State transfer fidelity linked to quantum stochastic resonance.

Enables multipartite entanglement in imperfect systems.

Abstract

We propose a protocol for perfect quantum state transfer that is resilient to a broad class of realistic experimental imperfections, including noise sources that could be modelled either as independent Markovian baths or as certain forms of spatially correlated environments. We highlight interesting connections between the fidelity of state transfer and quantum stochastic resonance effects. The scheme is flexible enough to act as an effective entangling gate for the generation of genuine multipartite entanglement in a control-limited setting. Possible experimental implementations using superconducting qubits are also briefly discussed.