{
  "id": "1708.04964",
  "version": "v1",
  "published": "2017-08-16T16:29:13.000Z",
  "updated": "2017-08-16T16:29:13.000Z",
  "title": "Quantum bit commitment and the reality of the quantum state",
  "authors": [
    "R. Srikanth"
  ],
  "comment": "10 pages, 2 figures",
  "categories": [
    "quant-ph"
  ],
  "abstract": "Quantum bit commitment (QBC) is insecure in the standard non-relativistic quantum cryptographic framework, essentially because Alice can exploit quantum steering to defer making her commitment. Two assumptions implicit in this framework are that: (a) the same system $E$ would be used for submitting the evidence for either commitment (That is, only the commitment-encoding states are different-- but not the submitted system itself-- for different commitments); and (b) system $E$ is quantum rather than classical. Here, we show how relaxing assumption (a) or (b) can render her malicious steering operation indeterminable or inexistent, respectively. Finally, we present a secure protocol that relaxes both assumptions in a quantum teleportation setting. Without appeal to an ontological framework, we argue that the protocol's security entails the reality of the quantum state, provided retrocausality is excluded.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-08-16T16:29:13.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "quantum bit commitment",
      "quantum state",
      "standard non-relativistic quantum cryptographic framework",
      "protocols security entails",
      "assumptions implicit"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 10,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}