iqm.benchmarks.utils_shadows.get_negativity

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iqm.benchmarks.utils_shadows.get_negativity#

iqm.benchmarks.utils_shadows.get_negativity(rho: ndarray, n_qubits_a: int, n_qubits_b: int) → float#

Computes the negativity of a given density matrix.

Note that a negativity >0 is only a necessary and sufficient condition for entanglement if n_qubits_a = n_qubits_b = 1. For more qubits per subsystems it is merely a necessary condition.

Parameters:

  • rho (ndarray) – Density matrix.

  • n_qubits_a (int) – Number of qubits for subsystem A.

  • n_qubits_b (int) – Number of qubits for subsystem B.

Returns:

The negativity of the input density matrix.

Return type:

float

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