Dagomir Kaszlikowski and Alastair Kay 2008 New J. Phys. 10 053026 doi:10.1088/1367-2630/10/5/053026
A witness of multipartite entanglement strata
Dagomir Kaszlikowski1,2,4 and Alastair Kay1,3
Show affiliationsWe describe an entanglement witness for N-qubit mixed states based on the properties of N-point correlation functions. As the degree of violation increases beyond different threshold values, or strata, this witness can guarantee that no more than M qubits are separable from the rest of the state for any M≤N, or that there is some genuine M-party or greater multipartite entanglement present. We illustrate the use our criterion by investigating the existence of entanglement in thermal stabilizer states, where we demonstrate that the witness is capable of witnessing bound-entangled states. Intriguingly, this entanglement can be shown to persist in the thermodynamic limit at arbitrary temperature.
- PACS
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03.67.Lx Quantum computation architectures and implementations
03.67.Mn Entanglement measures, witnesses, and other characterizations
- Subjects
- Dates
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Issue 5 (May 2008)
Received 21 February 2008
Published 20 May 2008
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A witness of multipartite entanglement strata
Dagomir Kaszlikowski and Alastair Kay 2008 New J. Phys. 10 053026
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