The PQM discussion group on 3 Dec 2025 will be delivered by Dr Peter Drmota (University of Oxford), speaking on this topic:
Remote entanglement for distributed quantum information processing and operational quantum advantage
Trapped ions are among the best qubit platforms for quantum computing due to their exceptionally high degree of coherence and indistinguishability. Moreover, their naturally strong interaction with light makes them particularly useful for quantum networking. My group operates one of the world’s most capable quantum network links, with remote entanglement exceeding 97% fidelity generated at an average generation rate of ~100/s [1]. We have used this network to demonstrate device-independent quantum key distribution [2], entangled optical atomic clocks [3], and verifiable blind quantum computing [4]. Here, I will talk about recent results on distributed quantum computation (DQC) [5] and quantum advantage at the odd-cycle game [6].
Our demonstration of DQC was enabled by the deterministic teleportation of controlled-Z gates between ‘circuit’ qubits in different computing nodes mediated by remote entanglement between ‘network’ qubits. We implemented multiple gates from the Clifford set, as well as Grover’s search algorithm.
The odd-cycle game is a didactic example of operational quantum advantage, and we have put it to the test in a faithful, loophole-free realisation in the lab. We show that entanglement can enhance the player’s winning probability significantly compared to the provably best non-entangled, classical, strategy.
[1] Phys. Rev. Lett. 124, 110501 (2020)
[2] Nature 607, 682–686 (2022)
[3] Nature 609, 689–694 (2022)
[4] Phys. Rev. Lett. 132, 150604 (2024)
[5] Nature 638, 383–388 (2025)
[6] Phys. Rev. Lett. 134, 070201 (2025)