We demonstrate that a weakly-coupled nonlinear dielectric waveguide surface-plasmon (DWSP-JJ) system can be formulated in analogy to bosonic Josephson junction of atomic condensates at very low temperatures, yet it exhibits different dynamical features. Such a system can be realized along a metal - dielectric interface where the dielectric medium hosts a nonlinear waveguide (e.g. fiber) for soliton propagation. The inherently dynamic coupling parameter generates novel features in the phase space.
We investigate collections of Nitrogen-Vacancy (N-V) Centers in diamond crystals coupled to a circuit QED
system of a coplanar waveguide (CPWG) resonator. Our analysis reveals that different symmetry axes oriented
N-V centers in the diamond host can be grouped into bosonic modes of collective quasi-spin wave excitations
so that the hybrid system can be described as an analog of an exciton-polariton type cavity QED model. We
examine such model for quantum state transfer among distinct crystallographic groups of N-V centers in a single
diamond as well as two spatially distant diamonds. Rabi oscillations, mode entanglement, possible use of N-V
classes as spin ensemble qubits and an implementation of continuous-time quantum random walk are discussed.
We have studied the surface plasmon theory with Bloch's hydrodynamic model. The results of the analysis
done by Bloch model have been compared with the ones done with Drude model and the dominant differences
between two models in valid frequency range have been shown. The transmittance of the slit embedded in a
metal layer has been investigated by these models and the differences have been emphasized. An electron density
dependent parameter defined by Bloch model has been used to control the transmission behavior of the light
through nano-apertures. A system consisting of a nano-slit formed in a metal layer with a periodically textured
surface used for beam focusing has been introduced and how the focusing capacity of the system is controlled
by the parameter defined by Bloch model has been shown.
Light can be slowed down to ultraslow speeds v ia
electromagnetically induced transparency in atomic Bose-Einstein
condensates. This is thought to be useful for storage of quantum
information for weak probe pulses. We investigate the effects of
inhomogeneous density profile of the condensate on propagation of
such ultraslow pulses. We find that spatial density of an atomic
condensate leads to a graded refractive index profile, for an
off-resonant probe pulse when condensate parameters are suitably
chosen. Within the window of negligible absorption, conditions for
degenerate multiple waveguide modes are determined. Both analytical
and numerical studies are presented to reveal the effects of
experimentally controllable parameters, such as temperature and
interatomic interaction strength on the number of modes. Group
velocity dispersion and modal dispersion are discussed. The effect
of waveguide dispersion, in addition to usual material dispersion,
on ultraslow pulses is pointed out.
A single photon source which generates transform limited single photons is highly desirable for applications in quantum optics. Transform limited emission guarantees the indistinguishability of the emitted single photons. This, in turn brings groundbreaking applications in linear optics quantum information processing within an experimental reach. Recently, self-assembled InAs quantum dots and trapped atoms have successfully been demonstrated as such sources for highly indistinguishable single photons.
Here, we demonstrate that nearly transform limited zero-phonon-line (ZPL) emission from single molecules can be obtained by using vibronic excitation. Furthermore we report the results of coincidence detection experiments at the output of a Michelson-type interferometer. These experiments reveal Hong-Ou-Mandel correlations as a proof of the indistinguishability of the single photons emitted consecutively from a single molecule. Therefore, single molecules constitute an attractive alternative to single InAs quantum dots and trapped atoms for applications in linear optics quantum information processing.
Experiments were performed with a home-built confocal microscope keeping the sample in a superfluid liquid Helium bath at 1.4K. We investigated terrylenediimide (TDI) molecules highly diluted in hexadecane (Shpol'skii matrix). A continuous wave single mode dye laser was used for excitation of vibronic transitions of individual molecules. From the integral fluorescence, the ZPL of single molecules was selected with a spectrally narrow interference filter. The ZPL emission was then sent to a scanning Fabry-Perot interferometer for linewidth measurements or a Michelson-type interferometer for coincidence detection.
Light propagation through vortex matter in atomic Bose-Einstein condensates is examined. It is shown that vortex matter can be used as a photonic crystal by a refractive index enhancement scheme. Band structure of the vortex lattice is numerically calculated. Index enhanced vortex matter is shown to exhibit large refractive index contrast with the dilute thermal gas background in the vortex core. Depending on the depth of the index contrast full or directional photonic band gaps are found in the band structure. Experimental parameters required to generate band gaps in the visible region of the electromagnetic spectrum are calculated.
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