Demonstration of teleportation across a quantum network code

TL;DR

This paper demonstrates successful quantum teleportation over a quantum network using measurement-based quantum network coding on superconducting processors, achieving higher fidelity than classical methods and providing practical techniques for quantum network coding implementation.

Contribution

It adapts measurement-based quantum network coding to superconducting devices and demonstrates teleportation with improved fidelity, offering new methods for quantum network coding testing.

Findings

Successful teleportation with fidelity above classical limits

Adaptation of MQNC to superconducting processor architecture

Generalization of MQNC for logical error-corrected layouts

Abstract

In quantum networks an important goal is to reduce resource requirements for the transport and communication of quantum information. Quantum network coding presents a way of doing this by distributing entangled states over a network that would ordinarily exhibit contention. In this work, we study measurement-based quantum network coding (MQNC), which is a protocol particularly suitable for noisy intermediate-scale quantum devices. In particular, we develop techniques to adapt MQNC to state-of-the-art superconducting processors and subsequently demonstrate successful teleportation of quantum information, giving new insight into MQNC in this context after a previous study was not able to produce a useful degree of entanglement. The teleportation in our demonstration is shown to occur with fidelity higher than could be achieved via classical means, made possible by considering qubits from a polar cap of the Bloch Sphere. We also present a generalization of MQNC with a simple mapping onto the heavy-hex processor layout and a direct mapping onto a proposed logical error-corrected layout. Our work provides some useful techniques for testing and successfully carrying out quantum network coding.