HAL (France)
open access
Entanglement of four qubit systems: a geometric atlas with polynomial compas I (the finite world)
We investigate the geometry of the four qubit systems by means of algebraic geometry and invariant theory, which allows us to interpret certain entangled states as algebraic varieties. More precisely we describe the nullcone, i.e., the set of states annihilated by all invariant polynomials, and also
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