Selective writing and read-out of a register of static qubits

TL;DR

This paper introduces a scalable quantum register system where static qubits are selectively written and read out via a flying qubit, utilizing quantum state transfer and system modulation for precise control.

Contribution

It presents a novel method for selective quantum state transfer in a large array of static qubits using a flying qubit and system modulation techniques.

Findings

Demonstrates selective quantum state transfer between a flying qubit and a specific static qubit.

Proposes a setup with a perfect mirror and modulated inter-qubit distances for control.

Shows the entire system's quantum mechanical behavior including motional degrees of freedom.

Abstract

We propose a setup comprising an arbitrarily large array of static qubits (SQs), which interact with a flying qubit (FQ). The SQs work as a quantum register, which can be written or read-out by means of the FQ through quantum state transfer (QST). The entire system, including the FQ's motional degrees of freedom, behaves quantum mechanically. We demonstrate a strategy allowing for selective QST between the FQ and a single SQ chosen from the register. This is achieved through a perfect mirror located beyond the SQs and suitable modulation of the inter-SQ distances.