Homodyne detection is a measurement technique used in quantum optics that allows for the precise extraction of phase and amplitude information from a light field. By mixing the incoming signal with a reference beam from a local oscillator, homodyne detection can provide information on the quadrature components of the light, which is crucial for continuous-variable quantum communication protocols. This method enhances the ability to analyze quantum states, particularly Gaussian states, making it an essential tool in quantum cryptography involving continuous variables.
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