Surface plasmon polaritons (SPPs) are localized surface electromagnetic waves that propagate along the interface between a metal and dielectric. Owing to their inherent subwavelength confinement, SPPs have strong potential become building blocks of type photonic circuitry built up on 2D surfaces; however, difficult control curved surfaces conformably flexibly produce advanced functional devices. Here we propose concept conformal plasmons (CSPs), can ultrathin flexible films long distances in...

We investigate qubit-qubit entanglement mediated by plasmons supported one-dimensional waveguides. explore both the situation of spontaneous formation from an unentangled state and emergence driven steady-state under continuous pumping. In cases, we show that large values for concurrence are attainable distances larger than operating wavelength using plasmonic waveguides currently available.

We show how both the subwavelength confinement associated with surface plasmons and one-dimensional character of plasmonic waveguides can be exploited to enhance coupling between quantum emitters. Resonance energy transfer phenomenon superradiance are investigated in three different waveguiding schemes (wires, wedges, channels) by means Finite Element Method. also develop a simplified model that is able capture main features numerical results.

A new approach for the spatial and temporal modulation of electromagnetic fields at terahertz frequencies is presented. The waveguiding elements are based on plasmonic metamaterial notions consist an easy-to-manufacture periodic chain metallic box-shaped protruding out a surface. It shown that dispersion relation corresponding modes rather insensitive to waveguide width, preserving tight confinement reasonable absorption loss even when transverse dimensions well in subwavelength regime. This...

We study the generation of entanglement between two distant qubits mediated by surface plasmons a metallic waveguide. show that V-shaped channel milled in flat is much more efficient for this purpose than cylinder. The role misalignments dipole moments qubits, an aspect great importance experimental implementations, also studied. A careful analysis quantum dynamics system means master equation shows two-qubit essentially due to dissipative part effective qubit-qubit coupling provided...

A single quantum emitter can possess a very strong intrinsic nonlinearity, but its overall promise for nonlinear effects is hampered by the challenge of efficient coupling to incident photons. Common optical materials, on other hand, are easy couple bulky, imposing severe limitation miniaturization photonic systems. In this Letter, we show that organic molecule acts as an extremely element in regime cavity electrodynamics. We report single-photon sensitivity signal generation and all-optical...

In this Letter we introduce a novel route for achieving negative-group-velocity waveguiding at deep-subwavelength scales. Our scheme is based on the strong electromagnetic coupling between two conformal surface plasmon structures. Using symmetry arguments and detailed numerical simulations, show that coupled system can be geometrically tailored to yield negative-index dispersion. A high degree of subwavelength modal confinement, λ/10 in transversal dimensions, also demonstrated. These...

We show that a broadband Fabry–Perot microcavity can assist an emitter coupled to off-resonant plasmonic nanoantenna inhibit the nonradiative channels affect quenching of fluorescence. identify interference mechanism creates necessary enhanced couplings and bandwidth narrowing hybrid resonance it entering into strong coupling regime. Our results provide new possibilities for improving efficiency solid-state emitters accessing diverse realms photophysics with structures be fabricated using...

We present a new type of waveguide scheme for terahertz circuitry based on the concept spoof surface plasmons. This structure is composed one-dimensional array L-shaped metallic elements horizontally attached to metal surface. The dispersion relation electromagnetic modes supported by this system presents very weak dependence with lateral dimension and are deep-subwavelength confined long-enough propagation length.

Efficient interactions between photons and atoms are an essential ingredient for future quantum networks. A new experiment uses optical resonator to create enhanced coupling light a single organic dye molecule.

Optical microcavities are often associated with laser physics, but here the authors show how a Fabry-P\'erot microresonator integrated an atomic force microscope can function as detector of individual nanoparticles such semiconductor quantum dots, carbon nanotubes, or biomolecules. Key features their system include broadband operation, tunable detection frequency, and lateral scanning. This instrument is also promising for applications in optics, e.g. efficient single-photon sources...

Direct detection of single photons at wavelengths beyond 2 microns under ambient conditions remains an outstanding technological challenge. One promising approach is frequency upconversion into the visible (VIS) or near-infrared (NIR) domain, where photon detectors are readily available. Here, we propose a nanoscale solution based on molecular optomechanical platform to up-convert from far and mid-infrared (covering part THz gap) VIS-NIR domain. We perform detailed analysis its outgoing...

We propose novel quantum antennas and metamaterials with a strong magnetic response at optical frequencies. Our design is based on the arrangement of natural emitters only electric dipole transition moments distances smaller than wavelength light but much larger their physical size. In particular, we show that an atomic dimer can serve as antenna its antisymmetric mode to enhance decay rate in vicinity by several orders magnitude. Furthermore, study metasurfaces composed bilayers without...

Chiral emission, where the handedness of a transition dipole determines direction in which photon is emitted, has recently been observed from atoms and quantum dots coupled to nanophotonic waveguides. Here, we consider case chiral light–matter interactions resonant structures, deriving closed-form expressions for fundamental electrodynamic quantities that describe these interactions. We show how parameters such as position dependent, directional Purcell factors mode volume can be calculated...

We present a proposal for tunable source of single photons operating in the terahertz (THz) regime. This scheme transforms incident visible into quantum THz radiation by driving polar emitter with an optical laser, its permanent dipole enabling dressed transitions enhanced resonant coupling to cavity. mechanism offers tunability properties such as frequency emission or statistics (ranging from antibunching entangled multiphoton states) modifying intensity and drive. show that implementation...

Molecules constitute compact hybrid quantum optical systems that can interface photons, electronic degrees of freedom, localized mechanical vibrations and phonons. In particular, the strong vibronic interaction between electrons nuclear motion in a molecule resembles optomechanical radiation pressure Hamiltonian. While molecular are often ground state even at elevated temperatures, one still needs to get handle on decoherence channels associated with phonons before an efficient network based...

We investigate the reduction of electromagnetic field fluctuations in resonance fluorescence from a single emitter coupled to an optical nanostructure. find that such hybrid systems can lead creation squeezed states light, with quantum significantly below shot-noise level. Moreover, physical conditions for achieving squeezing are strongly relaxed respect free space. A high degree control over light is feasible both far and near fields, opening pathway its manipulation applications on...

The optomechanical character of molecules was discovered by Raman about one century ago. Today, are promising contenders for high-performance quantum platforms because their small size and large energy-level separations make them intrinsically robust against thermal agitations. Moreover, the precision throughput chemical synthesis can ensure a viable route to technological applications. challenge, however, is that coupling molecular vibrations environmental phonons limits coherence...

In this Letter we identify coherent electron-vibron interactions between near-resonant and nonresonant electronic levels that contribute beyond standard optomechanical models for off-resonant or resonance surface-enhanced Raman scattering (SERS). By developing an open-system quantum model using first molecular interaction principles, show how the interference of both resonant contributions can provide several orders magnitude modifications SERS peaks with respect to former over fluorescence...

We report a driven-dissipative mechanism to generate stationary entangled W states among strongly interacting quantum emitters placed within cavity. Driving the ensemble into highest energy state-whether coherently or incoherently-enables subsequent cavity-enhanced decay an steady state consisting of single deexcitation shared all emitters, i.e., state, well known for its robustness against qubit loss. The nonharmonic structure allows this transition be resonantly selected by cavity, while...

Two nonidentical quantum emitters, when placed within a cavity and coherently excited at the two-photon resonance, can reach stationary states of nearly maximal entanglement. In Vivas-Viaña, Martín-Cano, Sánchez Muñoz [], we introduce frequency-resolved Purcell effect stabilizing entangled <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mi>W</a:mi></a:math> among strongly interacting emitters embedded in cavity. Here delve deeper into specific configuration with particularly rich...

We propose a scheme in which broadband nanostructures allow for an enhanced two-photon nonlinearity that generates squeezed light from far-detuned quantum emitters via collective resonance fluorescence. To illustrate the proposal, we consider pair of two-level detuned by 400 line widths are coupled plasmonic nanosphere. It is shown reduced fluctuations electromagnetic field arising interaction between provide means to detect their entanglement. Due near-field enhancement proposed hybrid...