Quantum metrology with entangled spin-coherent states of two modes
Document Type
Article
Publication Date
1-1-2012
Abstract
Recently, Gerry et al. [Phys. Rev. A 79, 022111 (2009)] studied the violation of the Bell-Clauser-Horne-Shimony-Holt inequality for two-spin systems, prepared in an entanglement of spin-coherent states, the so-called entangled spin-coherent states (ESCSs), and found maximal violations for a large class of states. In this paper, using the Holstein-Primakoff realization (HPR) of angular momentum algebra, we present an improved phase estimation scheme employing ESCSs and demonstrate that increasing the spin number gives the smallest variance in the phase parameter in comparison to NOON states under perfect and lossy conditions. The phase sensitivity of this interferometric scheme with parity detection on one of the output states is discussed.
Keywords
Noise, Quantum metrology, Spin-coherent, Bell-Clauser-Horne-Shimony-Holt inequality
Divisions
PHYSICS
Publication Title
Physical Review A
Volume
86
Issue
3
Publisher
American Physical Society
Additional Information
Department of Physics, Faculty of Science Building, University of Malaya, 50603 Kuala Lumpur, MALAYSIA