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Nature Communications

High-Fidelity quantum teleportation mediated by hole transfer in an acceptor–donor–radical molecular triad

Junhang Duan, Shunta Nakamura, Chelsie L. Greene, Samuel B. Tyndall, Ryan Michael Young, Matthew D. Krzyaniak, Michael R. Wasielewski

Published Mar 14, 2026• 1 citation
Publisher

Abstract

Quantum teleportation transfers quantum states between nodes in a quantum network through entanglement distribution and subsequent Bell-state measurements. Here, we report electron spin teleportation through an unexplored hole-transfer mechanism within an ensemble of covalently linked acceptor–donor–stable radical (A–D–R•) molecules. Photoexcitation of A after spin state preparation on R• results in ultrafast hole transfer to produce an entangled pair 1(A•−–D•+). A subsequent spontaneous hole transfer 1(A•−–1[D•+)–R•] → A•−–D–R+ constitutes a Bell-state measurement, projecting the spin state initially prepared on R• onto A•−. Quantum state tomography using pulse electron paramagnetic resonance spectroscopy reveals successful teleportation. A fidelity of 98% is achieved due to high entanglement purity, small Larmor frequency mismatch between sender and receiver radicals, as well as minimized delay between state preparation and teleportation. These results represent an important step in developing molecular materials that can transfer information coherently between nanoscale quantum devices. Recent advances with molecular qubits have enabled the implementation of spin quantum teleportation (QT), albeit with limited fidelity & applicability. Here, the authors demonstrate optimal QT of spin states via hole transfer in covalently linked acceptor-donor-radical molecules, opening towards rational design of molecular materials for coherent information transfer.

DOI
10.1038/s41467-026-70654-2

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Quantum teleportation transfers quantum states between nodes in a quantum network through entanglement distribution and subsequent Bell-state measurements. Here, we report electron spin teleportation through an unexplored hole-transfer mechanism within an ensemble of covalently linked acceptor–donor–stable radical (A–D–R•) molecules. Photoexcitation of A after spin state preparation on R• results in ultrafast hole transfer to produce an entangled pair 1(A•−–D•+). A subsequent spontaneous hole transfer 1(A•−–1[D•+)–R•] → A•−–D–R+ constitutes a Bell-state measurement, projecting the spin state initially prepared on R• onto A•−. Quantum state tomography using pulse electron paramagnetic resonance spectroscopy reveals successful teleportation. A fidelity of 98% is achieved due to high entanglement purity, small Larmor frequency mismatch between sender and receiver radicals, as well as minimized delay between state preparation and teleportation. These results represent an important step in developing molecular materials that can transfer information coherently between nanoscale quantum devices. Recent advances with molecular qubits have enabled the implementation of spin quantum teleportation (QT), albeit with limited fidelity & applicability. Here, the authors demonstrate optimal QT of spin states via hole transfer in covalently linked acceptor-donor-radical molecules, opening towards rational design of molecular materials for coherent information transfer.
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.
This paper proposes a novel quantum networking protocol leveraging quantum teleportation for rapid quantum information transfer within a network. Traditional quantum network architectures suffer from limited transmission speeds due to the requirement of physically transporting qubits. This protocol overcomes this limitation by utilizing the quantum entanglement and Bell states to facilitate instantaneous information transfer, circumventing the need for direct qubit conveyance. The core of the protocol relies on establishing and maintaining entanglement between nodes, followed by a Bell state measurement and classical communication to reconstruct the quantum state at the destination. This design offers a significantly faster method for quantum information distribution compared to conventional approaches. The theoretical framework is presented with detailed mathematical formulations of the key steps, including the Bell state measurement, the process of quantum state transfer, and the necessary classical communication protocols. This work contributes to the advancement of quantum networking technology and provides a foundation for future high-speed quantum communication systems.
Abstract Future quantum internet applications will derive their power from the ability to share quantum information across the network1,2. Quantum teleportation allows for the reliable transfer of quantum information between distant nodes, even in the presence of highly lossy network connections3. Although many experimental demonstrations have been performed on different quantum network platforms4–10, moving beyond directly connected nodes has, so far, been hindered by the demanding requirements on the pre-shared remote entanglement, joint qubit readout and coherence times. Here we realize quantum teleportation between remote, non-neighbouring nodes in a quantum network. The network uses three optically connected nodes based on solid-state spin qubits. The teleporter is prepared by establishing remote entanglement on the two links, followed by entanglement swapping on the middle node and storage in a memory qubit. We demonstrate that, once successful preparation of the teleporter is heralded, arbitrary qubit states can be teleported with fidelity above the classical bound, even with unit efficiency. These results are enabled by key innovations in the qubit readout procedure, active memory qubit protection during entanglement generation and tailored heralding that reduces remote entanglement infidelities. Our work demonstrates a prime building block for future quantum networks and opens the door to exploring teleportation-based multi-node protocols and applications2,11–13.
FINDING: Quantum teleportation is a protocol for transferring an unknown quantum state via shared entanglement and classical communication — not a physical transport of matter. The Oxford breakthrough (video 4) and the "trick of description" video (6) confirm this is a state-transfer, not a Star Trek-style transporter. | MATH: The core protocol uses a Bell state ∣Φ+⟩=12(∣00⟩+∣11⟩)|\Phi^+\rangle = \frac{1}{\sqrt{2}}(|00\rangle + |11\rangle)∣Φ+⟩=2​1​(∣00⟩+∣11⟩). Teleportation requires: (1) a 2-qubit entangled pair, (2) a Bell-state measurement on the sender's side (projecting onto the 4 Bell basis states), (3) 2 classical bits of information transmitted, (4) one of 4 unitary corrections {I,X,Z,XZ}\{I, X, Z, XZ\}{I,X,Z,XZ} applied by the receiver. The fidelity of teleportation without entanglement is bounded by 2/32/32/3 (classical limit); with perfect entanglement, fidelity = 1. The state transfer is instantaneous in the quantum channel but the classical bit transmission enforces the speed-of-light limit ccc. | CONNECTION: The Bell basi Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.com
Quantum teleportation faithfully transfers a quantum state between distant nodes in a network, enabling revolutionary information processing applications. Here we report teleporting quantum states over a 30 km optical fiber network with the input single photon state and the EPR state prepared independently. By buffering photons in 10 km coiled optical fiber, we perform Bell state measurement after entanglement distribution. With active feed-forward operation, the average quantum state fidelity and quantum process fidelity are measured to be 0.85 and 0.77, exceeding classical limits of 0.67 and 0.5, respectively. The statistical hypothesis test shows that the probability of a classical process to predict an average state fidelity no less than the one observed in our experiment is less than 2.4E-14, confirming the quantum nature of our quantum teleportation experiment. Our experiment marks a critical step towards the realization of quantum internet in the future.
Light's intrinsic carrier frequency of hundreds of terahertz theoretically enables information processing at terahertz clock rates. In optical quantum computing, continuous-variable quantum teleportation is the fundamental building block for deterministic logic operations. This protocol transfers unknown quantum states between nodes using quantum entanglement and real-time feedforward of measurement outcomes. However, electrical feedforward bottlenecks currently restrict operational bandwidths to approximately 100 megahertz, preventing the exploitation of light's ultimate speed. Here we show 1-terahertz-bandwidth all-optical quantum teleportation, completely bypassing this electronic limitation. By transferring Bell measurement outcomes optically, we successfully teleported vacuum states across the terahertz band and real-time random coherent wavepackets with a 42-picosecond temporal width. Evaluating the intrinsic state transfer quality, we achieved teleportation fidelities of F=0.784\mathcal{F}=0.784F=0.784 for the broadband vacuum states and F=0.770\mathcal{F}=0.770F=0.770 for the dynamic coherent wavepackets. Both results strictly surpass the classical limit of F=0.5\mathcal{F}=0.5F=0.5, demonstrating genuine quantum teleportation at ultrafast speeds. Our results establish that optical quantum processing speeds are constrained solely by the nonlinear medium's 1-picosecond-scale response, rather than classical electrical interfaces. This methodology provides a cornerstone for terahertz-clock quantum computers capable of overcoming Moore's law, and paves the way for a high-capacity, telecom-compatible quantum internet.