Polacchi Beatrice, Hoch Francesco, Rodari Giovanni, Savo Stefano, Carvacho Gonzalo, Spagnolo Nicolò, Giordani Taira, Sciarrino Fabio
Dipartimento di Fisica, Sapienza Università di Roma, Roma, Italy.
Npj Nanophoton. 2024;1(1):45. doi: 10.1038/s44310-024-00046-1. Epub 2024 Nov 29.
Quantum state teleportation represents a pillar of quantum information and a milestone on the roadmap towards quantum networks with a large number of nodes. Successful photonic demonstrations of this protocol have been carried out employing different qubit encodings. However, demonstrations in the Fock basis encoding are challenging, due to the impossibility of generating a coherent superposition of vacuum-one photon states on a single mode with linear optics. Indeed, previous realizations only allowed the teleportation of dual-rail entangled states, by exploiting ancillary electromagnetic modes. Here, instead, we enable the quantum teleportation of pure vacuum-one-photon qubits encoded in a single spatial mode, by exploiting coherent control of a resonantly excited semiconductor quantum dot in a micro-cavity. Within our setup, we can both teleport genuine single-rail vacuum-one-photon qubits and perform entanglement swapping. Our results may disclose new quantum information processing potentialities for this encoding, whose manipulation is achievable via quantum dot single-photon sources.
量子态隐形传态是量子信息的一个支柱，也是通往具有大量节点的量子网络路线图上的一个里程碑。该协议已通过采用不同的量子比特编码在光子学方面成功实现了演示。然而，在福克基编码中的演示具有挑战性，因为利用线性光学无法在单模上生成真空 - 单光子态的相干叠加。实际上，先前的实现仅通过利用辅助电磁模式实现了双轨纠缠态的隐形传态。相反，在这里，我们通过利用微腔中共振激发的半导体量子点的相干控制，实现了在单个空间模式中编码的纯真空 - 单光子量子比特的量子隐形传态。在我们的实验装置中，我们既可以隐形传态真正的单轨真空 - 单光子量子比特，也可以执行纠缠交换。我们的结果可能揭示这种编码的新的量子信息处理潜力，其操纵可通过量子点单光子源实现。
