Detection of small single-cycle signals by stochastic resonance using a bistable superconducting quantum interference device

Abstract

We propose and experimentally demonstrate detecting small single-cycle and few-cycle signals by using the symmetric double-well potential of a radio frequency superconducting quantum interference device (rf-SQUID). We show that the response of this bistable system to single-and few-cycle signals has a non-monotonic dependence on the noise strength. The response, measured by the probability of transition from initial potential well to the opposite one, becomes maximum when the noise-induced transition rate between the two stable states of the rf-SQUID is comparable to the signal frequency. Comparison to numerical simulations shows that the phenomenon is a manifestation of stochastic resonance.

Macroscopic resonant tunneling in an rf-SQUID flux qubit under a single-cycle sinusoidal driving *

“…The dynamics of an rf-SQUID can be analogous to a particle of mass Φ moving in a potential well. [27,28] The schematic of the measurement is shown in Fig. 1(a).…”

Quantum stochastic resonance in an a.c.-driven single-electron quantum dot

“…In stochastic resonance, the combination of a weak signal with noise leads to its amplification and optimization 1 . This phenomenon has been observed in several systems in contexts ranging from palaeoclimatology, biology, medicine, sociology and economics to physics [1][2][3][4][5][6][7][8][9] . In all these cases, the systems were either operating in the presence of thermal noise or were exposed to external classical noise sources.…”

Noise-induced temporal regularity and signal amplification in an optomechanical system with parametric instability

“…Some physical mechanisms allow noise to act beneficially, such as stochastic resonance (SR) [15,16] and coherence resonance (CR) [17][18][19]. As a mechanism for enhancing the response of a nonlinear system to a weak external signal, SR has been observed and investigated in various fields (see review [20]) and used widely to detect [21][22][23], amplify [24,25], and reconstruct [26,27] weak signals. Recently, SR has been introduced in the field of cavity optomechanics, examples being chaos-mediated optomechanical SR [28] and SR in a tristable optomechanical system [8].…”