Inseparability Criteria for Continuous Bipartite Quantum States
Abstract
We provide necessary and sufficient conditions for the partial transposition of bipartite harmonic quantum states to be nonnegative. The conditions are formulated as an infinite series of inequalities for the moments of the state under study. The violation of any inequality of this series is a sufficient condition for entanglement. Previously known entanglement conditions are shown to be special cases of our approach.
- Publication:
-
Physical Review Letters
- Pub Date:
- December 2005
- DOI:
- arXiv:
- arXiv:quant-ph/0508132
- Bibcode:
- 2005PhRvL..95w0502S
- Keywords:
-
- 03.67.Mn;
- 03.65.Ud;
- 42.50.Dv;
- Entanglement production characterization and manipulation;
- Entanglement and quantum nonlocality;
- Nonclassical states of the electromagnetic field including entangled photon states;
- quantum state engineering and measurements;
- Quantum Physics
- E-Print:
- 4 pages, no figures. Small misprints were corrected