{
  "id": "2401.04193",
  "version": "v1",
  "published": "2024-01-08T19:16:04.000Z",
  "updated": "2024-01-08T19:16:04.000Z",
  "title": "Schrödinger cats escape confinement",
  "authors": [
    "A. Krasznai",
    "G. Takács"
  ],
  "categories": [
    "cond-mat.stat-mech",
    "hep-th",
    "quant-ph"
  ],
  "abstract": "We consider local quenches from initial states generated by a single spin flip in either the true or the false vacuum state of the confining quantum Ising spin chain in the ferromagnetic regime. Contrary to global quenches, where the light-cone behaviour is strongly suppressed, we find a significant light-cone signal propagating with a nonzero velocity besides the expected localised oscillating component. Combining an analytic representation of the initial state with a numerical description of the relevant excitations using the two-fermion approximation, we can construct the spectrum of post-quench excitations and their overlaps with the initial state, identifying the underlying mechanism. For confining quenches built upon the true vacuum, the propagating signal consists of Schr{\\\"o}dinger cats of left and right-moving mesons escaping confinement. In contrast, for anti-confining quenches built upon the false vacuum, it is composed of Schr{\\\"o}dinger cats of left and right-moving bubbles which escape Wannier-Stark localisation.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2024-01-08T19:16:04.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "schrödinger cats escape confinement",
      "initial state",
      "quenches built",
      "false vacuum state",
      "confining quantum ising spin chain"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}