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peaks. On the other hand we see the effect of temperature; the measured noise become negative at higher temperature (as in the case ν = 1 and DC applied voltage$^{17}$) because of S$_{+}$ − $^{S}$− < 0 wich is larger than S$_{+}$ and because of the large population of LC oscillator states. 

## VI. CONCLUSION 

The central point of this paper has been the presentation of a measurement scheme for detecting finite frequency photo-as sisted noise of a mesoscopic conductor on which both a DC and an AC bias is imposed. This scheme uses a dissipative resonant circuit which is inductively compled to the mesoscopic circuit, in the same manner as some of the author’s previous work$^{17}$, which we reviewed at the begining of the paper. The major hurdle in analyzing PA shot noise lies in the lack of time translational invariance which results from the presence of the AC drive. We have shown that by considering the average of the charge correlator of the LC over the period of the AC drive, time translational invariance can be restored, and an extension of our previous detection scheme can be envisioned. 

We illustrated our detection scheme by applying it it to a concrete situation where PA noise features are most visible. We therefore considered the PA noise generated from a point contact in the weak-backscattering regime, placed in the regime of the FQHE. While the symmetrized PA noise at zero frequency was previously derived by some of us, no derivation of its full Keldysh components at finite frequency was available to this date. Th e PA noise contains singularities at frequencies corresponding to the bias voltage, with satellite singularities separated by the AC drive frequency. These sharp features in the noise are the main motivation for the application of our detection scheme. After deriving in this situation the current derivative correlator, we were 

