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We propose a simplest detector of harmonic vibrations with micro amplitudesand low frequencies, i.e. the detector consisting of one atomic beam. Here theatomic beam is induced by a plane harmonic wave and has a classical collectiveharmonic vibrations, which vibrant directions are perpendicular to the wavevectors of atomic beam. Compared with the detector consisting of atomicMach-Zehnder interferometer, the new detector has two advantages: (1) it issuitable for the detection of the harmonic vibrations induced either by alongitudinal plane harmonic wave or by a transverse plane harmonic wave; (2)the quantum noise fluctuation of the atomic beam is exactly zero.

One Atomic Beam as a Detector of Classical Harmonic Vibrations with Micro Amplitudes and Low Frequencies