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math-ph2024
On the rational invariants of quantum systems of -qubits
Luca Candelori, Vladimir Y. Chernyak, John R. Klein
For an -qubit system, a rational function on the space of mixed states which is invariant with respect to the action of the group of local symmetries may be viewed as a detailed…
math-ph2024
On the variety of X-states
Luca Candelori, Vladimir Y. Chernyak, John R. Klein
We introduce the notion of an X-state on -qubits. After taking the Zariski closure of the set of X-states in the space of all mixed states, we obtain a complex algebraic variety…