Nanowerk April 25, 2024 Recent advancements have witnessed a significant shift toward the utilization of “flat” optics with thickness at subwavelength scales for the development of quantum light sources. This approach offers notable advantages over conventional bulky counterparts, including compactness, scalability, and improved efficiency, along with added functionalities. In this review researchers in Australia focused on the recent advances in leveraging flat optics to generate quantum light sources. Specifically, the generation of entangled photon pairs through spontaneous parametric down-conversion in nonlinear metasurfaces, and single photon emission from quantum emitters including quantum dots and color centers in 3D and 2D materials […]
Tag Archives: Quantum light
Internet can achieve quantum speed with light saved as sound
Phys.org April 15, 2024 An international team of researchers (Denmark, Croatia) demonstrated a memory for light based on optomechanically induced transparency. They achieved a long storage time by leveraging the ultralow dissipation of a soft-clamped mechanical membrane resonator, which oscillated at MHz frequencies. At room temperature, they demonstrated a lifetime T1≈23 ms and a retrieval efficiency η≈40% for classical coherent pulses. According to the researchers the storage of quantum light is possible at moderate cryogenic conditions (T≈10K) and such systems could find applications in emerging quantum networks, where they could serve as long-lived optical quantum memories by storing optical information in […]
Scientists manipulate quantum fluids of light, bringing us closer to next-generation unconventional computing
Phys.org October 31, 2023 An international team of researchers (Russia, UK, Germany) investigated active spatial control of polariton condensates independent of the polariton, gain-inducing excitation profile by introducing an extra intracavity semiconductor layer, nonresonant to the cavity mode. Partial saturation of the optical absorption in the uncoupled layer enabled the ultrafast modulation of the effective refractive index and, through excited-state absorption, the polariton dissipation. Utilizing an intricate interplay of these mechanisms, they demonstrated control over the spatial profile, density, and energy of a polariton condensate at room temperature… read more. TECHNICAL ARTICLE
How quantum light sees quantum sound
Nanowerk October 3, 2023 Researchers in the UK have proposed a new way of using quantum light to ‘see’ quantum sound. They showed that the second-order, two-time correlation functions for phonons and photons emitted from a vibronic molecule in a thermal bath resulted in bunching and antibunching (a purely quantum effect), respectively. Signatures relating to phonon exchange with the environment were revealed in photon-photon correlations. They demonstrated that cross-correlation functions have a strong dependence on the order of detection giving insight into how phonon dynamics influences the emission of light. It is hoped that the discovery may help scientists better […]