Nonlinear response and observable signatures of equilibrium entanglement
| dc.creator | Zagoskin, A. M. | |
| dc.creator | Smirnov, A. Yu. | |
| dc.creator | Gupta, S. K. | |
| dc.creator | Slobodov, I. S. | |
| dc.date | 2005-10-19 | |
| dc.date | 2007-09-10 | |
| dc.date.accessioned | 2026-07-07T08:28:18Z | |
| dc.date.available | 2026-07-07T08:28:18Z | |
| dc.description | 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. | |
| dc.description | Expanded version; new co-authors; numerical calculations and new figures added; to appear in Quantum Information Processing (2007) | |
| dc.identifier | https://arxiv.org/abs/quant-ph/0510154 | |
| dc.identifier | http://arxiv.org/abs/quant-ph/0510154 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/137570 | |
| dc.subject | Quantum Physics | |
| dc.subject | Other Condensed Matter | |
| dc.title | Nonlinear response and observable signatures of equilibrium entanglement | |
| dc.type | text |