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Annalen der Physik

Dipolariton Systems: Quantum Noise and Squeezed Light by Dipolaritons in the Nonlinear Regime (Ann. Phys. 12/2019)

Houcem Jabri, Hichem Eleuch

Published Dec 1, 2019• 0 citations
Publisher

Abstract

Dipolaritons are quasiparticles formed in double quantum wells microcavities. Due to direct and indirect excitonic nonlinearities, the system generates a strong thermal resistant squeezing of light, as demonstrated in article number 1900253 by Houcem Jabri and Hichem Eleuch. Depending on the electron tunneling, the nonclassical effect attains its maximum at the limit of the pulsed tunneling regime. This scheme paves the way to new sources of strong squeezed light, offering other possibilities and alternatives.

DOI
10.1002/andp.201970045

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Dipolaritons are quasiparticles formed in double quantum wells microcavities. Due to direct and indirect excitonic nonlinearities, the system generates a strong thermal resistant squeezing of light, as demonstrated in article number 1900253 by Houcem Jabri and Hichem Eleuch. Depending on the electron tunneling, the nonclassical effect attains its maximum at the limit of the pulsed tunneling regime. This scheme paves the way to new sources of strong squeezed light, offering other possibilities and alternatives.
Abstract The quantum noise and the squeezing effect, in the transmitted light, by a dipolariton system formed by a double quantum wells microcavity in the strong coupling regime are investigated. It is shown that the indirect exciton nonlinearity generates stronger squeezing than the direct exciton nonlinearity, nevertheless produces very high fluctuations for some particular detunings and nonlinearities. The system shows a considerable sensitivity to the thermal excitations where the coupling to the direct and indirect excitonic thermal baths progressively destroys the nonclassical effect. Despite that, indirect exciton squeezing manifests a higher resistance against the thermal bath temperature. As a result, the emission field is strongly governed by the indirect excitons, varying between robust squeezing and excess noise.
Dipolaritons are quasiparticles formed in double quantum wells’ microcavities driven by a coherent field. Here, we investigate the correlations and the quantum fluctuations in the light emitted by a dipolariton cavity pumped by a laser. By studying the noise spectrum in the strong and weak coupling regimes, we show that the squeezing generated by the direct and indirect excitonic nonlinearities is strongly enhanced by coupling the system to a squeezed vacuum. As a consequence, this coupling transforms the statistical light propriety from coherent to highly squeezed states, depending on the squeeze parameter strength. Furthermore, the squeezed reservoir stabilizes the nonclassical effect even with the high fluctuations caused by indirect exciton nonlinearity. It turns out that the combination of excitonic nonlinearities and squeezed vacuum is a good solution for producing stable and strong squeezing.
In this paper, we investigate the nonlinear optical properties and photon correlations in a cavity containing quantum wells and interacting with a third-order nonlinear medium. More precisely, we study the interaction of the photonic Kerr nonlinearity with polariton and dipolariton quasiparticles in thermal environments. The optical bistability, the intensity spectrum, and the squeezing spectrum of the transmitted radiation are analyzed. It is shown that the regime of the bistability is reached in the dipolariton cavity faster than attained by the polariton system. Furthermore, the increase of the coupling with the wells reduces the squeezing. More interestingly, it turns out that the additional interactions arising in the dipolariton cavity, between direct and indirect excitons, slow down the variation of the squeezing. As a consequence, dipolaritons offer a greater margin of squeezed light than polaritons, and also than the ${\ensuremath{\chi}}^{(3)}$ medium in the absence of quantum wells. Moreover, the dipolariton system is found to be much more robust against the bath temperature in the weak-coupling regime.
We investigate the photon statistics of the light transmitted by a dipolariton system in interaction with a squeezed light from a degenerate optical parametric oscillator. We show that the presence of the squeezed photons in the cavity considerably increases the excitonic intensities and leads to a narrowing of the widths and a duplication of the intensity peaks. Our study reveals that the outgoing light exhibits a strong thermally resistant squeezing. Furthermore, it turns out that the weak-coupling regime is favorable to a perfect squeezing depending on the detunings and the strength of the squeezed pump. For a weak coherent driving field, the proposed system presents a bunching effect of the emitted light.
Squeezed light is a particularly useful quantum resource, which finds broad applications in quantum information processing, quantum metrology and sensing, and biological measurements. Here we show how to produce squeezed light exploiting the strong exciton–phonon nonlinear interaction in a semiconductor microcavity. The semiconductor microcavity is embedded with a quantum well, which supports both linear and nonlinear interactions among excitons, phonons, and cavity photons. We show that the strong exciton–phonon deformation potential interaction can induce a quadrature-squeezed cavity output field, and further reveal an important role of the exciton–photon coupling in engineering the squeezing spectrum and improving the robustness of the squeezing against thermal noise. Our results indicate that substantial optical squeezing in a broad band, up to tens of gigahertz, can be achieved using currently available parameters.
The use of a Kerr nonlinearity to generate squeezed light is a well-known way to surpass the quantum noise limit along a given field quadrature. Nevertheless, in the most common regime of weak nonlinearity, a single Kerr resonator is unable to provide the proper interrelation between the field amplitude and squeezing required to induce a sizable deviation from Poissonian statistics. We demonstrate experimentally that weakly coupled bosonic modes allow exploration of the interplay between squeezing and displacement, which can give rise to strong deviations from the Poissonian statistics. In particular, we report on the periodic bunching in a Josephson junction formed by two coupled exciton-polariton modes. Quantum modeling traces the bunching back to the presence of quadrature squeezing. Our results, linking the light statistics to squeezing, are a precursor to the study of nonclassical features in semiconductor microcavities and other weakly nonlinear bosonic systems.