Unconditional quantum teleportation between distant solid-state quantum bits

TLDR

Realizing robust quantum information transfer between long‑lived qubit registers is a key challenge for quantum information science and technology. The teleporter is prepared by photon‑mediated heralded entanglement between two distant electron spins, after which the source qubit is encoded in a single nuclear spin. We demonstrate unconditional teleportation of arbitrary quantum states between diamond spin qubits separated by 3 m, achieving deterministic Bell‑state measurement with real‑time feed‑forward and an average state fidelity above the classical limit, establishing diamond spin qubits as a prime candidate for quantum networks.

Abstract

Realizing robust quantum information transfer between long-lived qubit registers is a key challenge for quantum information science and technology. Here we demonstrate unconditional teleportation of arbitrary quantum states between diamond spin qubits separated by 3 meters. We prepare the teleporter through photon-mediated heralded entanglement between two distant electron spins and subsequently encode the source qubit in a single nuclear spin. By realizing a fully deterministic Bell-state measurement combined with real-time feed-forward we achieve teleportation in each attempt while obtaining an average state fidelity exceeding the classical limit. These results establish diamond spin qubits as a prime candidate for the realization of quantum networks for quantum communication and network-based quantum computing.