dorsal/arxiv
View SchemaNonlinear response and observable signatures of equilibrium entanglement
| Authors | A. M. Zagoskin, A. Yu. Smirnov, S. K. Gupta, I. S. Slobodov |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0510154 |
| URL | https://arxiv.org/abs/quant-ph/0510154 |
Abstract
We investigate how equilibrium entanglement is manifested in the nonlinear response of an $N$-qubit system. We show that in the thermodynamic limit the irreducible part of the $n$th-order nonlinear susceptibility indicates that the eigenstates of the system contain entangled $(n+1)$-qubit clusters. This opens the way to a directly observable multiqubit entanglement signature. We show that the irreducible part of the static cubic susceptibility of a system of four flux qubits, as a function of external parameters, behaves as a global 4-qubit entanglement measure introduced in Ref.\cite{Love}. We discuss the possibility of extracting purely-entanglement-generated contribution from the general multipoint correlators in a multiqubit system.
{
"annotation_id": "65e50907-4fa3-4e14-abf5-395ab82f43f6",
"date_created": "2026-03-02T18:02:20.707000Z",
"date_modified": "2026-03-02T18:02:20.707000Z",
"file_hash": "801cd5dd25f601d585d9e38ecd8f9fe00c37712909ba051d51370efab7300166",
"private": false,
"record": {
"abstract": "We investigate how equilibrium entanglement is manifested in the nonlinear\nresponse of an $N$-qubit system. We show that in the thermodynamic limit the\nirreducible part of the $n$th-order nonlinear susceptibility indicates that the\neigenstates of the system contain entangled $(n+1)$-qubit clusters. This opens\nthe way to a directly observable multiqubit entanglement signature. We show\nthat the irreducible part of the static cubic susceptibility of a system of\nfour flux qubits, as a function of external parameters, behaves as a global\n4-qubit entanglement measure introduced in Ref.\\cite{Love}.\n We discuss the possibility of extracting purely-entanglement-generated\ncontribution from the general multipoint correlators in a multiqubit system.",
"arxiv_id": "quant-ph/0510154",
"authors": [
"A. M. Zagoskin",
"A. Yu. Smirnov",
"S. K. Gupta",
"I. S. Slobodov"
],
"categories": [
"quant-ph",
"cond-mat.other"
],
"title": "Nonlinear response and observable signatures of equilibrium entanglement",
"url": "https://arxiv.org/abs/quant-ph/0510154"
},
"schema_id": "dorsal/arxiv",
"source": {
"execution_id": "ad9ab742-e2ad-4758-80e4-7f26a10795e1",
"id": "arXiv Dataset IDs",
"type": "Model",
"variant": "snapshot-2026-03-01",
"version": "0.1.0"
},
"user_id": 1000002
}