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Research in Optical Sciences

Quantum Measurements using Diamond Spins: From Fundamental Tests to Long-Distance Teleportation

Ronald Hanson

Published Jan 1, 2014• 0 citations
Publisher

Abstract

Spin qubits in diamond provide an excellent platform both for fundamental tests and for realizing extended quantum networks. Here we present our latest results, including the deterministic teleportation over three meters.
DOI
10.1364/qim.2014.qth4a.1

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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, quantum teleportation is achieved upon each attempt with 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.