Quantum state transfer for multi-input linear quantum systems

TL;DR

This paper develops a general theory for perfect quantum state transfer in multi-input passive linear quantum systems, using transfer function zeros, with applications to entanglement in quantum networks.

Contribution

It introduces a novel theoretical framework based on transfer function zeros for analyzing quantum state transfer in complex systems.

Findings

Derived conditions for perfect state transfer in multi-input systems

Connected transfer function zeros to entanglement distribution

Applicable to quantum network design and analysis

Abstract

Effective state transfer is one of the most important problems in quantum information processing. Typically, a quantum information device is composed of many subsystems with multi-input ports. In this paper, we develop a general theory describing the condition for perfect state transfer from the multi-input ports to the internal system components, for general passive linear quantum systems. The key notion used is the zero of the transfer function matrix. Application to entanglement generation and distribution in a quantum network is also discussed.