No-go theorem shows ancilla energy freedom does not raise max QFI beyond the signal-only optimum in Gaussian passive-unitary estimation under signal-energy constraint.
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No-Go Theorem for Ancilla-Assisted Gaussian Enhancement in Passive-Unitary Estimation
No-go theorem shows ancilla energy freedom does not raise max QFI beyond the signal-only optimum in Gaussian passive-unitary estimation under signal-energy constraint.