General monogamy relation for the entanglement of formation in multiqubit systems
| Autor: | Yuan-Fei Xu, Yan-Kui Bai, Zheng Wang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Quantum discord
Quantum Physics Quantum decoherence General Physics and Astronomy FOS: Physical sciences Concurrence Quantum entanglement State (functional analysis) Squashed entanglement Upper and lower bounds Multipartite entanglement Quantum mechanics Statistical physics Quantum Physics (quant-ph) Mathematics |
| Popis: | We prove exactly that the squared entanglement of formation, which quantifies the bipartite entanglement, obeys a general monogamy inequality in an arbitrary multiqubit mixed state. Based on this kind of exotic monogamy relation, we are able to construct two sets of useful entanglement indicator: the first one can detect all genuine multiqubit entangled states even in the case of the two-qubit concurrence and $n$-tangles being zero, while the second one can be calculated via quantum discord and applied to multipartite entanglement dynamics. Moreover, we give a computable and nontrivial lower bound for multiqubit entanglement of formation. 4.5 pages, 2 figures plus the supplemental material |
| Databáze: | OpenAIRE |
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