Quantumness beyond entanglement: The case of symmetric states
Abstract
Nowadays, it is accepted that truly quantum correlations can exist even in the absence of entanglement. For the case of symmetric states, a physically trivial unitary transformation can alter a state from entangled to separable, and vice versa. We propose to certify the presence of quantumness via an average of a state's bipartite entanglement properties over all physically relevant modal decompositions. We investigate extremal states for such a measure: SU(2)-coherent states possess the least quantumness, whereas the opposite extreme is inhabited by states with maximally spread Majorana constellations.
- Publication:
-
Physical Review A
- Pub Date:
- February 2022
- DOI:
- 10.1103/PhysRevA.105.022433
- arXiv:
- arXiv:2110.11361
- Bibcode:
- 2022PhRvA.105b2433G
- Keywords:
-
- Quantum Physics
- E-Print:
- 6 pages, 2 figures