New theory quantifies information loss in quantum circuits

Researchers have developed a theoretical framework to understand how information is lost in parameterized quantum circuits when using a fixed computational-basis measurement. They analyzed the quantum Fisher information, the full Fisher information in bitstring distributions, and the largest available response within a diagonal readout space. Their findings indicate that even with the full span of Pauli strings, a significant amount of information is lost, particularly as the circuit depth increases and the state-tangent frame approaches Haar randomness. AI

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