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Teleportation goes the distance

Physicists in the US have teleported information between distant ions for the first time. The breakthrough is a significant milestone in the quest for a workable quantum computer, say the researchers.

Physics WorldMar 1, 20090 citations

Experimental Quantum Teleportation of Qubits and Entanglement Swapping

Dik Bouwmeester, Jian-Wei Pan, Harald Weinfurter +1 more

Springer eBooksJan 1, 19991 citation

Qubit teleportation between non-neighbouring nodes in a quantum network

Sophie Hermans, Matteo Pompili, Hans K. C. Beukers +3 more

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.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.

arXiv:2110.11373NatureMay 25, 2022357 citations

Qubits made with entangled molecules

Martijn Boerkamp

Two independent groups report using ultracold molecules to encode quantum bits, as Martijn Boerkamp explains.

Physics WorldFeb 1, 20240 citations

Three-Party Quantum Network Communication Protocols Based on Quantum Teleportation

Nanrun Zhou, Hu-Lai Cheng, Li-Hua Gong +1 more

International Journal of Theoretical PhysicsDec 12, 20134 citations

Entanglement transmitted over 50 km

Martijn Boerkamp

A new experiment incorporates all the essential building blocks of a long-distance quantum network, as Martijn Boerkamp explains.

Physics WorldJul 1, 20230 citations