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We experimentally study a protocol of using the broadband high frequencysqueezed vacuum to detect the low-frequency signal. In this scheme, the lowersideband field of the squeezed light carries the low frequency modulationsignal and the two strong coherent light fields are applied as the bichromaticlocal oscillator in the homodyne detection to measure the quantum entanglementof the upper and lower sideband for the broadband squeezed light. The power ofone of the local oscillators for detecting the upper sideband can be adjustedto optimize the conditional squeezing in the low frequency regime bysubtracting the photocurrent of the upper sideband field of the squeezed lightfrom that of the low sideband field. By means of the quantum correlation of theupper and lower sideband for the broadband squeezed light, the low frequencysignal beyond the standard quantum limit is measured. This scheme isappropriate for enhancing sensitivity of the low frequency signal by the aid ofthe broad squeezed light, such as gravitational waes detection, and does notneed directly produce the low frequency squeezing in the optical parametricprocess.

Enhanced sensitivity of low-frequency signal by using broad squeezed light and bichromatic local oscillator