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We experimentally realize the generation of high-order photon encoded W-states involving up to 16 optical modes. Furthermore, we exploit the inherent probabilistic properties of these multipartite entangled W-states for generating genuine random numbers.
Spectrally resolved optical interferometry (spectro-interferometry) is used in astronomy to deliver highresolution images of astronomical targets and study their morphological features [1]. To this end, measurements of the visibility and phase of interference fringes obtained by combining simultaneously light collected by several distant telescopes are required. High precision visibility measurements...
The one-dimensional (1D) Dirac equation governs the dynamics of relativistic fermions. Several of its elusive predictions have been successfully investigated in classical optical simulators, for massive [1] as well as for massless [2] fermions.
In contrast to popular belief, it is possible to simulate a relativistic Dirac equation in classical paraxial optical waveguide arrays. Here, we present various simulations of relativistic phenomena in different structures, including so-called “optical graphene”.
We present the dynamical creation of electron-positron pairs due the instability of the quantum vacuum. We observed this effect in an optical model system which is an array fabricated by femtosecond laser direct inscription.
We experimentally realized a waveguide device with alternating positive and negative coupling and show that this geometry is an optical simulator of the conditions found for a massless relativistic particle described by the one-dimensional Dirac-equations.
We experimentally demonstrate negative coupling between two defect guides in a waveguide lattice and elaborate the required conditions to explain, why this effect can only be found for negative defects and certain geometric devices.
Integrated photonic components have demonstrated outstanding performance in beam combination for infrared astronomical interferometry [1] thanks to their exceptional thermo-mechanical stability and small physical dimensions, suitable for cryogenic assemblies. Planar photonic circuits are currently used in existing devices combining up to 4-telescopes simultaneously on all possible baselines [2], thus...
Bloch oscillations [1] have been a widely studied subject since the late twenties of the last century, giving rise to research in many fields of physics such as solid-state, semiconductor physics, ultracold atoms, optical waveguides and plasmonics. Optical waveguide systems enable sophisticated studies of this complex phenomenon in simple settings. In this work we experimentally demonstrate nontrivial...
The optical manifestation of solid-state phenomena has become a field of increasing interest in recent years [1].When transferring the physics of particles onto an optical setting, the observer benefits from spatial instead of temporal evolution of the wave function, which can be directly monitored. However, the wave evolution in optics is commonly paraxial and, hence, described by a Schrödinger-type...
Amorphous systems possess various non-intuitive features, entirely based on their intrinsic random structure and absence of any long-range order [1]. One of their most striking properties is the existence of a gap in the spectrum of eigenstates despite the lack of Bragg scattering [2]. Recently, the concept of amorphous lattices exhibiting a band gap was introduced in optics, and demonstrated using...
Discrete solitons in photonic lattices [1] offer manifold possible applications in integrated optics. Of particular interest is purely optical switching and routing: solitons may be used to block paths within photonic networks [2]. Hence, detailed knowledge about the influence of junctions on soliton formation is essential. Junctions constitute purely topological perturbations of the system's periodicity...
Discrete light propagation in lattices of evanescently coupled waveguides represents a very elegant and noise-insensitive realisation of continuous-time single-particle quantum random walks [1,2]. On the other hand, two or more indistinguishable walkers exhibit nonclassical correlations, and therefore increase the graph size substantially. Such walks have been proposed and realised for product states...
We report on the observation of relativistic wave evolution in a waveguide array. The high frequency trembling motion, known as Zitterbewegung is observed in specially designed waveguide arrays.
We present, experimentally and theoretically, coupled defect-waveguides in an amorphous photonic lattice, exhibiting enhanced coupling by virtue of disorder.
We demonstrate numerically and experimentally how the presence of so-called Topo-logical Defects represented by junctions within otherwise periodical planar photonic lattices influences the formation of discrete solitons similar to conventional defects constituted by detuned waveguides.
In recent years, photonic lattices fabricated by the femtosecond laser direct writing technique in fused silica have emerged as the tool of choice for the experimental investigation of light propagation in discrete optical systems with Kerr nonlinearity. In this article, we review the recent results of our research conducted in this field and present our latest findings on the reflection of transversely...
We report on soliton formation in laserwritten two-dimensional binary waveguide lattices. Even for small index contrasts between the sublattices, soliton intensity profiles and power thresholds strongly depend on whether “deep” or “shallow” channels are excited.
We report on the experimental realization of zigzag waveguide lattices, where second-order coupling influences linear and nonlinear light evolution. Band structure deformation and changes in soliton thresholds are analyzed depending on higher-order coupling.
We report on octave spanning 50:50 beam splitting via an interrupted stimulated Raman adiabatic passage in femtosecond laser written waveguides. The device is spatially and spectrally characterized by utilizing color center fluorescence at several excitation wavelengths.
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