Document Type
Article
Publication Date
7-9-2018
Abstract
We theoretically study the phase sensitivity of an SU(1,1) interferometer with a thermal state and a squeezed vacuum state as inputs and parity detection as the measurement. We find that the phase sensitivity can beat the shot-noise limit and approaches the Heisenberg limit, with increasing input photon number, in an ideal situation. We also consider the e ect of various noises, including photon loss, dark counts, and thermal photon noise. Our results show that the phase sensitivity is below the shot-noise limit with photon loss and dark counts, but cannot beat the shot-noise limit in the presence of thermal noise.
Publication Source (Journal or Book title)
Optics Express
First Page
18492
Last Page
18504
Recommended Citation
Ma, X., You, C., Adhikari, S., Matekole, E., Glasser, R., Lee, H., & Dowling, J. (2018). Sub-shot-noise-limited phase estimation via SU(1,1) interferometer with thermal states. Optics Express, 26 (14), 18492-18504. https://doi.org/10.1364/OE.26.018492