A Gaussian measure of quantum phase noise

摘要: We study the width of semiclassical phase distribution a quantum state in its dependence on average number photons (m) this state. As measure noise, we choose width, delta phi, best Gaussian approximation to dominant peak probability curve. For coherent state, decreases with square root (m), whereas for truncated it linearly increasing (m). an optimal phi exponentially but so does area caught underneath peak: all is stored broad wings distribution.