Phys.org February 2, 2024 Integrated quantum photonics has enabled the generation, manipulation, and detection of quantum states of light with steadily increasing scale and complexity levels. The exploration of on-chip integration has accumulated substantial progresses in recent years toward the realization of low-cost, large-scale quantum photonic circuits. Researchers in China reviewed the underlying mechanism and discuss state-of-the-art SFWM on-chip quantum light sources fabricated with various structures and materials on chip. They enumerated the most appealing applications of on-chip SFWM such as heralding single-photon source, entangled photon source, and system-level integration… read more. Open Access TECHNICAL ARTICLE
Category Archives: Quantum light
Researchers develop a new source of quantum light
MIT News June 22, 2023 While colloidal perovskite nanocrystals offer a great source of synthetically scalable, tunable photon sources, observation of two-photon quantum interference from the emission of any colloidal nanoparticle has not been previously reported. Researchers at MIT prepared large CsPbBr3 nanocrystals and observed direct evidence of interference between indistinguishable single photons sequentially emitted from a single nanocrystal. They measured Hong–Ou–Mandel interference from photons in CsPbBr3 nanocrystals, showing corrected visibilities of up to 0.56 ± 0.12 in the absence of any radiative enhancement or photonic architecture. According to the researchers their results demonstrate the unique potential of perovskite nanocrystals to serve […]
Scientists open door to manipulating ‘quantum light’
Nanowerk March 20, 2023 The nonlinearity provided by the atom leads to a strong dependence of the light–matter interface on the number of photons interacting with the two-level system within its emission lifetime. This nonlinearity unveils strongly correlated quasiparticles known as photon bound states, giving rise to key physical processes such as stimulated emission and soliton propagation. Although signatures consistent with the existence of photon bound states have been measured in strongly interacting Rydberg gases their hallmark excitation-number-dependent dispersion and propagation velocity have not yet been observed. An international team of researchers (Switzerland, Australia, Germany) has reported the direct observation […]
Researchers devise a new path toward ‘quantum light’
Science Daily February 2, 2023 Strongly driven systems of emitters offer an attractive source of light over broad spectral ranges up to the X-ray region. A key limitation of these systems is that the light they emit is mostly classical. An international team of researchers (USA – Harvard University, MIT, UK, Israel, Austria) overcame this constraint by building a quantum-optical theory of strongly driven many-body systems, showing that the presence of correlations among the emitters creates emission of non-classical many-photon states of light. They considered the example of high-harmonic generation, by which a strongly driven system emits photons at integer […]