{
  "id": "2003.11799",
  "version": "v1",
  "published": "2020-03-26T08:59:49.000Z",
  "updated": "2020-03-26T08:59:49.000Z",
  "title": "Quantum Alice and Silent Bob: Qubit-based Quantum Key Recycling with almost no classical communication",
  "authors": [
    "Daan Leermakers",
    "Boris Skoric"
  ],
  "categories": [
    "quant-ph"
  ],
  "abstract": "We answer an open question about Quantum Key Recycling (QKR): Is it possible to put the message entirely in the qubits without increasing the number of qubits? We show that this is indeed possible. We introduce a prepare-and-measure QKR protocol where the communication from Alice to Bob consists entirely of qubits. As usual, Bob responds with an authenticated one-bit accept/reject classical message. Compared to Quantum Key Distribution (QKD), QKR has reduced round complexity. Compared to previous qubit-wise QKR protocols, our scheme has far less classical communication. We provide a security proof in the universal composability framework and find that the communication rate is asymptotically the same as for QKD with one-way postprocessing.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-03-26T08:59:49.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "classical communication",
      "silent bob",
      "quantum alice",
      "qubit-based quantum",
      "authenticated one-bit accept/reject classical message"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}