Digital quantum metrology

Digital quantum metrology

Seminar author:Lorenzo Maccone

Event date and time:05/29/2017 04:00:pm

Event location:GiQ's seminar room

Event contact:

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

theory), and show that the former can be attained only by sequential

strategies or parallel strategies that employ entanglement among

probes, whereas parallel-separable strategies are limited by the

latter.  We highlight the differences between this setting and the

RMSE-based one.