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.
Link to the article: https://www.nature.com/articles/s44310-024-00046-1
B. Polacchi, F. Hoch, G. Rodari, S. Savo, G. Carvacho, N. Spagnolo, T. Giordani, F. Sciarrino. Teleportation of a genuine single-rail vacuum-one-photon qubit generated via a quantum dot source, npj Nanophoton 1, 45 (2024) [arXiv:2310.20521]