Conditional Teleportation of Quantum-Dot Spin States

TL;DR

This paper demonstrates evidence for quantum teleportation of electron spin qubits in semiconductor quantum dots, highlighting progress in quantum information transfer using matter-based qubits.

Contribution

First experimental evidence of quantum teleportation of electron spin states in semiconductor quantum dots, advancing quantum communication in solid-state systems.

Findings

Evidence for conditional teleportation of spin eigenstates

Demonstration of entanglement swapping in quantum dots

Implications for scalable quantum information transfer

Abstract

Among the different platforms for quantum information processing, individual electron spins in semiconductor quantum dots stand out for their long coherence times and potential for scalable fabrication. The past years have witnessed substantial progress in the capabilities of spin qubits. However, coupling between distant electron spins, which is required for quantum error correction, presents a challenge, and this goal remains the focus of intense research. Quantum teleportation is a canonical method to transmit qubit states, but it has not been implemented in quantum-dot spin qubits. Here, we present evidence for quantum teleportation of electron spin qubits in semiconductor quantum dots. Although we have not performed quantum state tomography to definitively assess the teleportation fidelity, our data are consistent with conditional teleportation of spin eigenstates, entanglement swapping, and gate teleportation. Such evidence for all-matter spin-state teleportation underscores the capabilities of exchange-coupled spin qubits for quantum-information transfer.