## Digital quantum metrology

Quantum Metrology calculates the ultimate precision of all estimation

strategies, measuring what is their root mean-square error (RMSE) and

their Fisher information. Here, instead, we ask how many bits of the

parameter we can recover, namely we derive an information-theoretic

quantum metrology. In this setting we redefine "Heisenberg bound" and

"standard quantum limit" (the usual benchmarks in quantum estimation