Filters

2018 - 20192

More filters

2021 - 20232
Reset filters

Settings

search.filters.applied.f.access: openAccess × Author: Perez-Leija, Armando × Start date: 2020 × Version: publishedVersion × Publisher: London : Nature Publ. Group ×

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Multiphoton quantum-state engineering using conditional measurements
    (London : Nature Publ. Group, 2019) Magaña-Loaiza, Omar S.; de J. León-Montiel, Roberto; Perez-Leija, Armando; U’Ren, Alfred B.; You, Chenglong; Busch, Kurt; Lita, Adriana E.; Nam, Sae Woo; Mirin, Richard P.; Gerrits, Thomas
    The quantum theory of electromagnetic radiation predicts characteristic statistical fluctuations for light sources as diverse as sunlight, laser radiation, and molecule fluorescence. Indeed, these underlying statistical fluctuations of light are associated with the fundamental physical processes behind their generation. In this contribution, we experimentally demonstrate that the manipulation of the quantum electromagnetic fluctuations of two-mode squeezed vacuum states leads to a family of quantum-correlated multiphoton states with tunable mean photon numbers and degree of correlation. Our technique relies on the use of conditional measurements to engineer the excitation mode of the field through the simultaneous subtraction of photons from two-mode squeezed vacuum states. The experimental generation of nonclassical multiphoton states by means of photon subtraction unveils novel mechanisms to control fundamental properties of light. As a remarkable example, we demonstrate the engineering of a quantum state of light with up to ten photons, exhibiting nearly Poissonian photon statistics, that constitutes an important step towards the generation of entangled lasers. Our technique enables a robust protocol to prepare quantum states with multiple photons in high-dimensional spaces and, as such, it constitutes a novel platform for exploring quantum phenomena in mesoscopic systems. © 2019, The Author(s).
  • Thumbnail Image
    Item
    Endurance of quantum coherence due to particle indistinguishability in noisy quantum networks
    (London : Nature Publ. Group, 2018) Perez-Leija, Armando; Guzmán-Silva, Diego; León-Montiel, Roberto de J.; Gräfe, Markus; Heinrich, Matthias; Moya-Cessa, Hector; Busch, Kurt; Szameit, Alexander
    Quantum coherence, the physical property underlying fundamental phenomena such as multi-particle interference and entanglement, has emerged as a valuable resource upon which modern technologies are founded. In general, the most prominent adversary of quantum coherence is noise arising from the interaction of the associated dynamical system with its environment. Under certain conditions, however, the existence of noise may drive quantum and classical systems to endure intriguing nontrivial effects. In this vein, here we demonstrate, both theoretically and experimentally, that when two indistinguishable non-interacting particles co-propagate through quantum networks affected by non-dissipative noise, the system always evolves into a steady state in which coherences accounting for particle indistinguishabilty perpetually prevail. Furthermore, we show that the same steady state with surviving quantum coherences is reached even when the initial state exhibits classical correlations.