Transferring quantum information between a quantum system with limited control and a quantum computer

TL;DR

This paper introduces quantum algorithms for transferring information between a limited-control qubit system and a quantum computer, using fixed interaction Hamiltonians and gate sequences, enabling hybrid quantum information processing.

Contribution

It provides a method to transfer quantum information in hybrid systems with limited control, using closed-form gate sequences tailored to the interface Hamiltonian.

Findings

Algorithms effectively transfer quantum information.

Gate sequences are explicitly derived for given interactions.

Approximations are achieved with high fidelity.

Abstract

We consider a hybrid quantum system consisting of a qubit system continuously evolving according to its fixed own Hamiltonian and a quantum computer. The qubit system couples to a quantum computer through a fixed interaction Hamiltonian, which can only be switched on and off. We present quantum algorithms to approximately transfer quantum information between the qubit system with limited control and the quantum computer under this setting. Our algorithms are programmed by the gate sequences in a closed formula for a given interface interaction Hamiltonian.