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Experimental Validation of Quantum Steering Ellipsoids and Tests of Volume Monogamy Relations
- Source :
- Physical Review Letters. 122
- Publication Year :
- 2019
- Publisher :
- American Physical Society (APS), 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.
- Subjects :
- Physics
Quantum Physics
business.industry
FOS: Physical sciences
General Physics and Astronomy
Concurrence
Quantum entanglement
Experimental validation
16. Peace & justice
Polarization (waves)
01 natural sciences
Ellipsoid
Quantum mechanics
Qubit
0103 physical sciences
Photonics
Quantum Physics (quant-ph)
010306 general physics
business
Quantum
Subjects
Details
- ISSN :
- 10797114 and 00319007
- Volume :
- 122
- Database :
- OpenAIRE
- Journal :
- Physical Review Letters
- Accession number :
- edsair.doi.dedup.....e0079668c6a2102463a0c12a8c39d945