Phase Estimation with Thermal State and Fock State via Parity Detection
WANG Shuai
WU Shi-chen
SUI Yong-xing
Abstract：In quantum precision based optical interferometer, the phase sensitivity crucially depends on the nature of the quantum state.We analytically prove when a Mach-Zehnder interferometer powered by a Fock state into one input port, a thermal state, a squeezed vacuum state or a squeezed thermal state with same average photon number at the other input, the same performances in the phase estimation via parity detection can be obtained for small phase shift.We analytically prove that the parity detection saturates the quantum Cramér-Rao bound.In addition, our results show that besides a coherent state, a thermal state is another useful high-intensity classical state for the phase estimation.
Keywords：quantum precisionMach-Zehnder interferometerparity detectionthermal stateFock state
Publication Date：2018-01-01
Online Publishing Date：2026-08-28(First online date of this platform, not the publication date of the document)
Pages：7( 77-82,110 )