Quantum metrology with two-mode squeezed vacuum: parity detection beats the Heisenberg limit.
We study the sensitivity and resolution of phase measurement in a Mach-Zehnder interferometer with two-mode squeezed vacuum (n photons on average). We show that superresolution and sub-Heisenberg sensitivity is obtained with parity detection. In particular, in our setup, dependence of the signal on the phase evolves n times faster than in traditional schemes, and uncertainty in the phase estimation is better than 1/n, and we saturate the quantum Cramer-Rao bound.
Anisimov
Petr M
PM
Hearne Institute for Theoretical Physics and Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA. petr@lsu.edu
Raterman
Gretchen M
GM
Chiruvelli
Aravind
A
Plick
William N
WN
Huver
Sean D
SD
Lee
Hwang
H
Dowling
Jonathan P
JP