Optimization of ultrafine entanglement witnesses
arXiv:1803.11065 · doi:10.1103/PhysRevA.97.032343
Abstract
The ultrafine entanglement witness, introduced in [F. Shahandeh, M. Ringbauer, J.C. Loredo, and T.C. Ralph, Phys. Rev. Lett. \textbf{118}, 110502 (2017)], can seamlessly and easily improve any standard entanglement witness. In this paper, by combining the constraint and the test operators, we rotate the hyperplane determined by the test operator and improve further the original ultrafine entanglement witness. In particular, we present a series of new ultrafine entanglement witnesses, which not only can detect entangled states that the original ultrafine entanglement witnesses cannot detect, but also have the merits that the original ultrafine entanglement witnesses have.
arXiv comment8 pages
References in corpus (10)
- Quantum entanglement
- Separability of Mixed States: Necessary and Sufficient Conditions
- Entanglement detection
- Bell Inequalities and the Separability Criterion
- Optimization of entanglement witnesses
- Non-maximally entangled states: production, characterization and utilization
- Qudit Quantum State Tomography
- Entanglement witnesses: construction, analysis and classification
- Necessary and sufficient conditions for bipartite entanglement
- Ultrafine Entanglement Witnessing