Quantum Division The notion of quantum mechanics is that variables are expressed as integer values. In fluids, for instance, vortices quantized in terms the polarization and phase shifts observed multiples 2π, is, full rotations each variable around vortex core. Theoretical work has predicted some instances there should be half-quantum vortices, where circumventing core characterized by just π polarization. By observing exciton-polariton condensates Lagoudakis et al. (p. 974 ) present...

The capability of on-chip wavefront modulation has the potential to revolutionize many optical device technologies. However, realization power-efficient phase-gradient metasurfaces that offer full-phase (0 2π) and high operation speeds remains elusive. We present an approach continuously steer light is based on creating a virtual frequency-gradient metasurface by combining passive with advanced frequency-comb source. Spatiotemporal redirection naturally occurs as phase-fronts reorient at...

We report on the observation of spontaneous coherent oscillations in a microcavity polariton bosonic Josephson junction. Condensation exciton polaritons here takes place under incoherent excitation double potential well naturally formed disorder. Coherent set at an power above condensation threshold. The time resolved population and phase dynamics reveal analogy with ac effect. A theoretical two-mode model describes observed effects, explaining how different realizations pulsed experiment...

Silicon carbide is a promising platform for single photon sources, quantum bits (qubits), and nanoscale sensors based on individual color centers. Toward this goal, we develop scalable array of nanopillars incorporating silicon vacancy centers in 4H-SiC, readily available efficient interfacing with free-space objective lensed-fibers. A commercially obtained substrate irradiated 2 MeV electron beams to create vacancies. Subsequent lithographic process forms 800 nm tall 400-1400 diameters. We...

The on-chip generation of nonclassical states light is a key requirement for future optical quantum hardware. In solid-state cavity electrodynamics, such can be generated from self-assembled dots strongly coupled to photonic crystal cavities. Their anharmonic strong light-matter interaction results in large nonlinearities at the single photon level, where admission into may enhance (photon tunneling) or diminish blockade) probability second enter cavity. Here, we demonstrate that detuning...

The experimental investigation of spontaneously created vortices is utmost importance for the understanding quantum phase transitions towards a superfluid phase, especially two-dimensional systems that are expected to be governed by Berezinski-Kosterlitz-Thouless physics. By means time-resolved near-field interferometry we track path such vortices, at random locations in an exciton-polariton condensate under pulsed nonresonant excitation, their final pinning positions imposed stationary...

Quantum emitters are an integral component for a broad range of quantum technologies, including communication, repeaters, and linear optical computation. Solid-state color centers promising candidates scalable optics due to their long coherence time small inhomogeneous broadening. However, once excited, often decay through phonon-assisted processes, limiting the efficiency single-photon generation photon-mediated entanglement generation. Herein, we demonstrate strong enhancement spontaneous...

Exciton-polariton condensation can be regarded as a self-organization phenomenon, where phase ordering is established among particles in the system. In such condensed systems, further occur particle density distribution, under particular experimental conditions. this work we report on spontaneous pattern formation polariton condensate nonresonant optical pumping. The slightly elliptical ring-shaped excitation laser that employ forces to into single-energy state with periodic boundary...

Real- and momentum-space spectrally resolved images of microcavity polariton emission in the regime condensation are investigated under nonresonant excitation using a laser source with reduced intensity fluctuations on time scale exciton lifetime. We observe that consists many macroscopically occupied modes. Lower-energy modes strongly localized by spatial polaritonic potential disorder few microns. Higher-energy have finite $k$ vectors delocalized over $10--15\text{...

Condensation of exciton polaritons in semiconductor microcavities takes place despite in-plane disorder. Below the critical density, inhomogeneity disorder limits spatial extension ground state. Above presence weak disorder, this limitation is spontaneously overcome by nonlinear interaction, resulting an extended synchronized phase. In case strong several non-phase-locked condensates can be evidenced. The transition from a phase to desynchronized addressed sampling cavity

Abstract Nanophotonics has emerged as a powerful tool for manipulating light on chips. Almost all of today's devices, however, have been designed using slow and ineffective brute-force search methods, leading in many cases to limited device performance. In this article, we provide complete demonstration our recently proposed inverse design technique, wherein the user specifies constraints form target fields rather than dielectric constant profile particular use method demonstrate new...

We use the third- and fourth-order autocorrelation functions $g^{(3)}(\tau_1,\tau_2)$ $g^{(4)}(\tau_1,\tau_2, \tau_3)$ to detect non-classical character of light transmitted through a photonic-crystal nanocavity containing strongly-coupled quantum dot probed with train coherent pulses. contrast value $g^{(3)}(0, 0)$ conventionally used $g^{(2)}(0)$ demonstrate that in addition being necessary for detecting two-photon states emitted by low-intensity source, $g^{(3)}$ provides more clear...

Abstract Diamond hosts optically active color centers with great promise in quantum computation, networking, and sensing. Realization of such applications is contingent upon the integration into photonic circuits. However, current diamond optics experiments are restricted to single devices few emitters because fabrication constraints limit device functionalities, thus precluding center integrated In this work, we utilize inverse design methods overcome cutting-edge nanofabrication fabricate...

Abstract The progress in integration of nanodiamond with photonic devices is analyzed the light quantum optical applications. Nanodiamonds host a variety optically active defects, called color centers, which provide rich ground for engineering. Theoretical introduction describing and matter interaction between modes emitter presented, including role Debye–Waller factor typical center emission. synthesis diamond nanoparticles discussed an overview methods leading to experimentally realized...

The quest for identification and understanding of fractional vorticity is a major subject research in the quantum fluids domain, ranging from superconductors, superfluid Helium-3 to cold atoms. In two-dimensional Bose degenerate gas with spin degree freedom, fundamental topological excitations are vortical entities, called half-quantum vortices. Convincing evidence existence vortices was recently provided spinor polariton condensates. can be regarded as structural components singly charged...

Polariton condensates have proved to be model systems investigate topological defects, as they allow for direct and nondestructive imaging of the condensate complex order parameter. The fundamental excitations such are quantized vortices. In specific configurations, further ordering can bring formation vortex lattices. this work we demonstrate spontaneous ordered vortical states, consisting in geometrically self-arranged vortex-antivortex pairs. A mean-field generalized Gross-Pitaevskii...

The photon blockade (PB) effect in emitter-cavity systems depends on the anharmonicity of ladder dressed energy eigenstates. recent developments color center photonics are leading toward experimental demonstrations multi-emitter-cavity solid-state with an expanded set levels compared to traditionally studied single-emitter systems. We focus case N = 2 nonidentical quasi-atoms strongly coupled a nanocavity bad cavity regime (with parameters within reach systems), and discover three PB...

We report on the simultaneous observation of spontaneous symmetry breaking and long-range spatial coherence both in strong weak-coupling regime a semiconductor microcavity. Under pulsed excitation, formation stochastic order parameter is observed polariton photon lasing regimes. Single-shot measurements Stokes vector emission exhibit buildup polarization. Below threshold, polarization noise does not exceed 10%, while above threshold we observe total up to 50% after each excitation pulse,...

We demonstrate cavity-enhanced Raman emission from a single atomic defect in solid. Our platform is silicon-vacancy center diamond coupled with monolithic photonic crystal cavity. The cavity enables an unprecedented frequency tuning range of the (100 GHz) that significantly exceeds spectral inhomogeneity centers nanostructures. also show selectively suppresses phonon-induced spontaneous degrades efficiency photon generation. results pave way towards photon-mediated many-body interactions...

We report on time-resolved measurements of the first order spatial coherence in an exciton-polariton Bose-Einstein condensate. Long-range is found to set right at onset stimulated scattering, a picosecond time scale. The reaches its maximum value after population and decays slowly, staying up few hundred picoseconds. This behavior can be qualitatively reproduced, using stochastic classical field model describing interaction between polariton condensate exciton reservoir within disordered potential.

We study the coherence and density modulation of a nonequilibrium exciton-polariton condensate in one-dimensional valley with disorder. By means interferometric measurements we evidence first-order function relate it to disorder-induced density, that increases as pump power is increased. The nonmonotonic spatial found be result strong character system, presence

We present the design, fabrication, and characterization of cubic (3C) silicon carbide microdisk resonators with high quality factor modes at visible near-infrared wavelengths (600–950 nm). Whispering gallery factors as 2300 corresponding mode volumes V ∼ 2 × (λ/n)3 are measured using laser scanning confocal microscopy room temperature. obtain excellent correspondence between transverse-magnetic (TM) transverse-electric (TE) polarized resonances simulated Finite Difference Time Domain (FDTD)...