Detection of signals in presence of noise through Josephson junction switching currents

Abstract

Josephson junctions can be employed to reveal a sinusoidal signal in presence of Gaussian noise. To mimic realistic setups, the detection is performed linearly ramping the bias current until a switch to the finite voltage occurs; the analysis of the resulting switching currents can be exploited to decide about the presence of the harmonic drive. The signal is applied in two conditions: with an unknown initial phase (incoherent strategy) and with a known initial phase (coherent strategy). In both conditions, the analysis of the efficiency of the detection, performed through the signal-to-noise ratio, as estimated by the Kumar-Carrol index, shows that the dependence upon the Josephson junction ramp rate is beneficial, especially for relatively fast speed. One can conclude that the collection of the switching currents is a robust technique, and thus it is possible to exploit the advantages of a predetermined finite time to collect the data.

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Cited by in corpus (7)

• Voltage drop across Josephson junctions for Lévy noise detection
• Analysis of Josephson junctions switching time distributions for the detection of single microwave photons
• Auto-correlative weak-value amplification under strong noise background
• Approaching energy quantum limit detection of microwave photons with Josephson Junctions
• Josephson-based scheme for the detection of microwave photons
• Mitigating Source and Detection Noises in Auto-correlative Weak-Value Amplification
• Measuring weak microwave signals via current-biased Josephson Junctions II: Arriving at single-photon detection sensitivity