Multiphoton Stokes-parameter invariant for entangled states
Journal Article
·
· Physical Review. A
- Department of Electrical and Computer Engineering, Boston University, Boston, Massachusetts 02215 (United States)
- Department of Mathematics, Boston University, Boston, Massachusetts 02215 (United States)
We consider the Minkowskian norm of the n-photon Stokes tensor, a scalar invariant under the group realized by the transformations of stochastic local quantum operations and classical communications (SLOCC). This invariant is offered as a candidate entanglement measure for n-qubit states and discussed in relation to measures of quantum state entanglement for certain important classes of two-qubit and three-qubit systems. This invariant can be directly estimated via a quantum network, obviating the need to perform laborious quantum state tomography. We also show that this invariant directly captures the extent of entanglement purification due to SLOCC filters.
- OSTI ID:
- 20633822
- Journal Information:
- Physical Review. A, Journal Name: Physical Review. A Journal Issue: 3 Vol. 67; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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