1996/04/22 by Tomáš Opatrný, T. Opatrny, D. -G. Welsch +2 · 20 citations
Engineering · Physics and Astronomy · #Advanced Fiber Laser Technologies #Amplitude #Computer science #Density matrix #Direct-conversion receiver #Fourier transform #Homodyne detection #Local oscillator #Mode (computer interface) #Multi-mode optical fiber #Optical Network Technologies #Optical fiber #Optics #Phase (matter) #Phase noise #Photonic and Optical Devices #Physics #Quantum #Quantum mechanics #Quantum optics #SIGNAL (programming language) #quant-ph
paper · pdf · doi:10.1016/s0030-4018(96)00548-2
published in Optics Communications 134(1-6), 112-116 (Elsevier BV) · 6 pages, latex
arxiv created 1996/04/22 · openalex publication_date 1997/01/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
A new method is described for determining the quantum state of correlated multimode radiation by interfering the modes and measuring the statistics of the superimposed fields in four-port balanced homodyne detection. The full information on the N-mode quantum state is obtained by controlling both the relative amplitudes and the phases of the modes, which simplifies the reconstruction of density matrices to only N+1 Fourier transforms. In particular, this method yields time-correlated multimode density matrices of optical pulses by superimposing the signal by a sequence of short local-oscillator pulses.