title: Quantum information. Unconditional quantum teleportation between distant solid-state quantum bits.
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, 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.
authors.affiliation: Kavli Institute of Nanoscience Delft, Delft University of Technology, Post Office Box 5046, 2600 GA Delft, Netherlands.
authors.forename: W
authors.initials: W
authors.lastname: Pfaff
authors.affiliation: Kavli Institute of Nanoscience Delft, Delft University of Technology, Post Office Box 5046, 2600 GA Delft, Netherlands.
authors.forename: B J
authors.initials: BJ
authors.lastname: Hensen
authors.affiliation: Kavli Institute of Nanoscience Delft, Delft University of Technology, Post Office Box 5046, 2600 GA Delft, Netherlands.
authors.forename: H
authors.initials: H
authors.lastname: Bernien
authors.affiliation: Kavli Institute of Nanoscience Delft, Delft University of Technology, Post Office Box 5046, 2600 GA Delft, Netherlands.
authors.forename: S B
authors.initials: SB
authors.lastname: van Dam
authors.affiliation: Kavli Institute of Nanoscience Delft, Delft University of Technology, Post Office Box 5046, 2600 GA Delft, Netherlands.
authors.forename: M S
authors.initials: MS
authors.lastname: Blok
authors.affiliation: Kavli Institute of Nanoscience Delft, Delft University of Technology, Post Office Box 5046, 2600 GA Delft, Netherlands.
authors.forename: T H
authors.initials: TH
authors.lastname: Taminiau
authors.affiliation: Kavli Institute of Nanoscience Delft, Delft University of Technology, Post Office Box 5046, 2600 GA Delft, Netherlands.
authors.forename: M J
authors.initials: MJ
authors.lastname: Tiggelman
authors.affiliation: Kavli Institute of Nanoscience Delft, Delft University of Technology, Post Office Box 5046, 2600 GA Delft, Netherlands.
authors.forename: R N
authors.initials: RN
authors.lastname: Schouten
authors.affiliation: Element Six, Ltd., Kings Ride Park, Ascot, Berkshire SL5 8BP, UK.
authors.forename: M
authors.initials: M
authors.lastname: Markham
authors.affiliation: Element Six, Ltd., Kings Ride Park, Ascot, Berkshire SL5 8BP, UK.
authors.forename: D J
authors.initials: DJ
authors.lastname: Twitchen
authors.affiliation: Kavli Institute of Nanoscience Delft, Delft University of Technology, Post Office Box 5046, 2600 GA Delft, Netherlands. r.hanson@tudelft.nl.
authors.forename: R
authors.initials: R
authors.lastname: Hanson