In this work we present measurements of the sensitivity of a low noise microwave receiver developed with the aim to detect a feeble quantum electrodynamics effect known as dynamical Casimir effect. We study the performance of the receiver when it is connected to a transmission line ending with an antenna coupled to a resonant microwave cavity. The noise temperature of the receiver is measured with the method of the variable temperature load resistor. The noise generated by the cavity is measured in a similar way. An equivalent input noise of (2.0 ± 0.02)x10^22 W/Hz is measured at the receiver input. This is equivalent to a sensitivity of approximately 100 photons, well below the expected signal from the quantum vacuum photons.
|Titolo:||Characterization of a low noise microwave receiver for the detection of vacuum photons|
|Citazione:||Braggio, C., Bressi, G., Carugno, G., DELLA VALLE, F., Galeazzi, G., & Ruoso, G. (2009). Characterization of a low noise microwave receiver for the detection of vacuum photons. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT, 603, 451-455.|
|Appare nelle tipologie:||1.1 Articolo in rivista|
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