Quantum Noise in Homodyne Detection
Optical homodyne detection theory is of considerable current interest in connection with the interpretation of experiments [1–3] on squeezed light. The theory has been developed in great detail and generality [4–6]. The aim of the present work is a clarification of the noise properties of the detection process. Pictorial representations are used to show the sources of noise and their contributions to the output noise in ordinary and balanced four-port homodyne detection, where only one signal quadrature is measured. A more general scheme is described for eight-port homodyne detection in which both quadratures are measured with arbitrary relative weights. The noise properties of this more complicated detector are also interpreted pictorially.
KeywordsBeam Splitter Photon Number Local Oscillator Output Mode Noise Property
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