We present the full characterization of phase-randomized or phase-averaged coherent states, a class of states exploited in communication channels and in decoy state-based quantum key distribution protocols. We report on the suitable formalism to analytically describe the main features of these states and on their experimental investigation, that results in agreement with theory. In particular, we consider a recently proposed non-Gaussianity measure based on the quantum fidelity, that we compare with previous ones, and we use the mutual information to investigate the amount of correlations one can produce by manipulating this class of states.
© 2013 Optical Society of America
Original Manuscript: May 9, 2013
Revised Manuscript: July 25, 2013
Manuscript Accepted: August 12, 2013
Published: September 6, 2013
Alessia Allevi, Maria Bondani, Paulina Marian, Tudor A. Marian, and Stefano Olivares, "Characterization of phase-averaged coherent states," J. Opt. Soc. Am. B 30, 2621-2627 (2013)