States for phase estimation in quantum interferometry
Combes, J, Howard M. Wiseman · CERN Document Server (European Organization for Nuclear Research) · 2004
Ramsey interferometry allows the estimation of the phase $\\phi$ of rotation of the pseudospin vector of an ensemble of two-state quantum systems. For $\\phi$ small, the noise-to-signal ratio scales as the spin-squeezing parameter $\\xi$, with $\\xi = (|N,0>+|0,N>)/\\sqrt{2}$) using several different properties, including $\\xi$, $\\zeta$, the coefficients in the pseudo angular momentum basis (in the three primary directions) and the angular Wigner function $W(\\theta,\\phi)$. Finally we discuss the experimental options for creating phase squeezed states and doing single-shot phase estimation.