  For the first time, the theory and practical realization of a broadband
quantum noise generator based on original integrated optical beam splitter in
the form of a Mach-Zehnder interferometer is demonstrated. The beam splitter
with a double output, made on a lithium niobate substrate, provided accurate
electro-optical balancing of the homodyne quantum noise detection circuit.
According to our knowledge, the experimentally obtained excess of quantum noise
over classical noise by 12 dB in the frequency band over 4 GHz, which is the
best parameters of quantum noise generators known from the literature.
