Spinor stochastic resonance

Abstract

We report on noise-induced spin ordering in a collective quasiparticle system: spinor stochastic resonance. Synergetic interplay of a polarization-modulated signal and a polarization noise allows us to switch coherently between the two metastable states of a microcavity-polariton spin bistable system. Spinor stochastic resonance is demonstrated in a zero-dimensional GaAs based microcavity. The resonance behaviors of both the spin amplification and the signal-to-noise ratio are experimentally evidenced as a function of the noise strength for different amplitude modulations. They are theoretically reproduced using a spinor Gross-Pitaevskii equation driven by a randomly polarized laser field.

Effect of a noisy driving field on a bistable polariton system

“…Having established that the laser noise is a possible way of coupling external noise to the polariton system, it is indeed possible that, for the right amount of noise, one would see an increase in the coherent response of the amplified modulated signal, rather than the expected decrease. As a matter of fact, stochastic resonance has been observed in polariton bistable systems [29,30]. It has been shown that, by applying in the input laser power a small amplitude modulation with frequency around 1 kHz, the stochastic resonance appears for a range of noise power (between 0.1 to 0.3 B) in the polariton system [29].…”

“…As a matter of fact, stochastic resonance has been observed in polariton bistable systems [29,30]. It has been shown that, by applying in the input laser power a small amplitude modulation with frequency around 1 kHz, the stochastic resonance appears for a range of noise power (between 0.1 to 0.3 B) in the polariton system [29]. Actually here we found that, for this amount of noise, the Kramers time is of the order of milliseconds, which is indeed around the modulation period, as expected for the observation of stochastic resonance [31].…”

Spatial multistability induced by cross interactions of confined polariton modes

“…This effect is caused by the population of one polariton spin state that can induce a blue shift in the orthogonally polarized polariton branch [33]. Then, the overall competition between the excitation laser polarization, spinor interactions, and cavity anisotropy dictates the possible outcome of the multistability [28,31,33].…”

“…The bistability and spinor multistability of a microcavity polariton have been extensively studied both theoretically [16][17][18][19][20][21][22] and experimentally [23][24][25][26][27][28][29][30][31][32]. It relies on exciting the microcavity using a laser blue detuned with respect to the lower polariton branch (LP) and to measure the transmitted laser intensity.…”

Reservoir-induced decoherence of resonantly excited confined polaritons

“…Concurrently, previous works have shown that zerodimensional (0D) confined polaritons are ideal systems to investigate the polariton bistability [33][34][35][36] and particularly * clauderic.ouellet-plamondon@epfl.ch its sensitivity to noise [36][37][38]. The former study showed that a symmetrical collapse of the polariton hysteresis loop occurs for increasing noise strength on the polariton population.…”