Quantum state transfer and maximal entanglement between distant qubits using a minimal quasicrystal pump

TL;DR

This paper demonstrates a minimal-control quantum pump based on a one-dimensional quasicrystal chain that enables efficient quantum state transfer and entanglement generation between distant qubits, with robustness against disorder.

Contribution

It introduces a novel quasicrystal-based quantum pump that facilitates robust state transfer and entanglement with minimal control parameters, suitable for various experimental platforms.

Findings

Successful transfer of quantum states between distant ends of the chain.

Generation of maximally entangled Bell states between external qubits.

Robustness of the protocol against disorder in the system.

Abstract

Coherent quantum state transfer over macroscopic distances between non-neighboring elements in quantum circuits is a crucial component to increase connectivity and simplify quantum information processing. To facilitate such transfers, an efficient and easily controllable quantum pump would be highly beneficial. In this work, we demonstrate such a quantum pump based on a one-dimensional quasicrystal Fibonacci chain~(FC). In particular, we utilize the unique properties of quasicrystals to pump the edge-localized winding states between the two distant ends of the chain by only minimal manipulation of the FC at its end points. We establish the necessary conditions for successful state transfer within a fully time-dependent picture and also demonstrate robustness of the transfer protocol against disorder. We then couple external qubits to each end of the FC and establish highly adaptable functionality as a quantum bus with both on-demand switching of the qubit states and generation of maximally entangled Bell states between the qubits. Thanks to the minimal control parameters, the setup is well-suited for implementation across diverse experimental platforms, thus establishing quasicrystals as an efficient platform for versatile quantum information processing.