Quantum Cramer-Rao bound and parity measurement
We show, by using parity detection, that the phase estimate obtained from the linear error propagation formula, indeed saturates the lower bound set by maximizing quantum Fisher information for several of the well-known states, proposed for the Heisenberg limited interferometry. Our results show that one can achieve the quantum Cramér-Rao bound, by simply counting the number of photons which is not very far from actual realization. © 2010 Copyright SPIE - The International Society for Optical Engineering.
Publication Source (Journal or Book title)
Proceedings of SPIE - The International Society for Optical Engineering
Chiruvelli, A., & Lee, H. (2010). Quantum Cramer-Rao bound and parity measurement. Proceedings of SPIE - The International Society for Optical Engineering, 7611 https://doi.org/10.1117/12.842817