Quantum teleportation of physical qubits into logical code-spaces

TL;DR

This paper demonstrates teleporting quantum information from a physical qubit into an error-corrected logical qubit using entangled resource states, advancing fault-tolerant quantum computing.

Contribution

It introduces a method to teleport quantum states into logical code-spaces, a key step towards scalable, fault-tolerant quantum computation.

Findings

Achieved teleportation fidelities up to 0.786

Created maximally entangled states between physical and logical qubits

Proposed scheme is fully fault-tolerant

Abstract

Quantum error correction is an essential tool for reliably performing tasks for processing quantum information on a large scale. However, integration into quantum circuits to achieve these tasks is problematic when one realizes that non-transverse operations, which are essential for universal quantum computation, lead to the spread of errors. Quantum gate teleportation has been proposed as an elegant solution for this. Here, one replaces these fragile, non-transverse inline gates with the generation of specific, highly entangled offline resource states that can be teleported into the circuit to implement the non-transverse gate. As the first important step, we create a maximally entangled state between a physical and an error-correctable logical qubit and use it as a teleportation resource. We then demonstrate the teleportation of quantum information encoded on the physical qubit into the error-corrected logical qubit with fidelities up to 0.786. Our scheme can be designed to be fully fault-tolerant so that it can be used in future large-scale quantum technologies.