Protecting Quantum Fisher Information in Correlated Quantum Channels
Protecting Quantum Fisher Information in Correlated Quantum Channels
Quantum Fisher information (QFI) has potential applications in quantum metrology tasks. We investigate QFI when the consecutive actions of a quantum channel on the sequence of qubits have partial classical correlations. Our results showed that while the decoherence effect is detrimental to QFI, effects of such classical correlations on QFI …