Jedrkiewicz, O. and Loudon, R. and Jeffers, J. (2005) Retrodiction for coherent communication with homodyne or heterodyne detection. European Physical Journal D: Atomic, Molecular, Optical and Plasma Physics, 39 (1). pp. 129-140. ISSN 1434-6060Full text not available in this repository. (Request a copy from the Strathclyde author)
Previous work on the retrodictive theory of direct detection is extended to cover the homodyne detection of coherent optical signal states |alpha > and |-alpha >. The retrodictive input state probabilities are obtained by the application of Bayes' theorem to the corresponding predictive distributions, based on the probability operator measure (POM) elements for the homodyne process. Results are derived for the retrodictive information on the complex amplitude of the signal field obtainable from the difference photocount statistics of both 4-port and 8-port balanced homodyne detection schemes. The local oscillator is usually assumed much stronger than the signal but the case of equal strengths in 4-port detection is also considered. The calculated probability distributions and error rates are illustrated numerically for values of signal and local oscillator strengths that extend from the classical to the quantum regimes.
|Keywords:||optical communication, quantum cryptography, statistics, Optics. Light, Atomic and Molecular Physics, and Optics|
|Subjects:||Science > Physics > Optics. Light|
|Department:||Faculty of Science > Physics|
|Depositing user:||Pure Administrator|
|Date Deposited:||15 Jun 2011 15:38|
|Last modified:||06 Jan 2017 09:37|