Quantum Metrology with Two-Mode Squeezed Vacuum: Parity Detection Beats the Heisenberg Limit
Abstract
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.
- Publication:
-
Physical Review Letters
- Pub Date:
- March 2010
- DOI:
- arXiv:
- arXiv:0910.5942
- Bibcode:
- 2010PhRvL.104j3602A
- Keywords:
-
- 42.50.St;
- 42.50.Dv;
- 42.50.Ex;
- 42.50.Lc;
- Nonclassical interferometry subwavelength lithography;
- Nonclassical states of the electromagnetic field including entangled photon states;
- quantum state engineering and measurements;
- Optical implementations of quantum information processing and transfer;
- Quantum fluctuations quantum noise and quantum jumps;
- Quantum Physics
- E-Print:
- 4 pages, 4 figures