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Experimental Validation of Quantum Steering Ellipsoids and Tests of Volume Monogamy Relations.
- Source :
-
Physical Review Letters . 2/22/2019, Vol. 122 Issue 7, p1-1. 1p. - Publication Year :
- 2019
-
Abstract
- The set of all qubit states that can be steered to by measurements on a correlated qubit is predicted to form an ellipsoid--called the quantum steering ellipsoid--in the Bloch ball. This ellipsoid provides a simple visual characterization of the initial two-qubit state, and various aspects of entanglement are reflected in its geometric properties. We experimentally verify these properties via measurements on many different polarization-entangled photonic qubit states. Moreover, for pure three-qubit states, the volumes of the two quantum steering ellipsoids generated by measurements on the first qubit are predicted to satisfy a tight monogamy relation, which is strictly stronger than the well-known monogamy of entanglement for concurrence. We experimentally verify these predictions, using polarization and path entanglement. We also show experimentally that this monogamy relation can be violated by a mixed entangled state, which nevertheless satisfies a weaker monogamy relation. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ELLIPSOIDS
*QUBITS
Subjects
Details
- Language :
- English
- ISSN :
- 00319007
- Volume :
- 122
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- Physical Review Letters
- Publication Type :
- Academic Journal
- Accession number :
- 134920372
- Full Text :
- https://doi.org/10.1103/PhysRevLett.122.070402