2010/07/31 by William N Plick, William N. Plick, Petr M Anisimov +6
Computer Science · Physics and Astronomy · #Coherent states #Detector #Direct-conversion receiver #Gaussian #Homodyne detection #Interferometry #Parity (physics) #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum optics #Quantum optics and atomic interactions #quant-ph
paper · pdf · doi:10.1088/1367-2630/12/11/113025
published as New Journal of Physics 12, 113025 (2010) · 12 pages, 4 figures, comments welcome
openalex publication_date 2010/11/11 · arxiv created 2012/08/09 · arxiv updated 2015/05/19 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present a method of directly obtaining the parity of a Gaussian state of light without recourse to photon-number counting. The scheme uses only a simple balanced homodyne technique, and intensity correlation. Thus interferometric schemes utilizing coherent or squeezed light, and parity detection may be practically implemented for an arbitrary photon flux. Specifically we investigate a two-mode, squeezed-light, Mach-Zehnder interferometer and show how the parity of the output state may be obtained. We also show that the detection may be described independent of the parity operator, and that this "parity-by-proxy" measurement has the same signal as traditional parity.