Accepted papers to appear in an upcoming issue
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Quantum Information Splitting and Open-Destination Teleportation using Decomposable Multipartite Quantum Channel. Part 2: Experimental
- received 12/20/2013; accepted 03/28/2014; posted 04/09/2014; Doc. ID 203488
- [full text: PDF (359) KB)]
- Abstract: Full detail of the experimental set-up required for implementing and verifying theoretical scheme for four-partite splitting and open-destination teleportation of an arbitrary two-qubit photonic state is discussed. In this experiment quantum channel is provided by a pair of decomposable generalized (G) Bell-states, which offer experimental advantage that they can be very easily generated in photonic experiments. Our experiment is based on generating two-qubit photonic state by ultra-fast spontaneous parametric down-conversion (SPDC) in nonlinear crystal and relies on Bell-state measurements, which in this experiment are performed by an optical Bell-state analyzer that can unambiguously determine all four Bell-states. In this experiment unitary transformation required at the destination station is implemented using quantum control NOT gate. We finally show that in our four-partite optical system two-qubit photonic state originally prepared at a sending station can be experimentally split and subsequently regenerated at any one of the three distinct receiving stations.
- (270.0270) Quantum optics : Quantum optics
- (320.2250) Ultrafast optics : Femtosecond phenomena
- (270.5565) Quantum optics : Quantum communications
- (270.5585) Quantum optics : Quantum information and processing
Selectively addressing optically non-linear nanocrystals by polarization shaped ultrafast laser pulses
- received 02/21/2014; accepted 03/26/2014; posted 03/28/2014; Doc. ID 206676
- [full text: PDF (4441) KB)]
- Abstract: A non-centrosymmetric nanocrystal can produce second-harmonic generation (SHG) and sum-frequency generation (SFG) upon interaction with a laser field. The SHG or SFG radiation depends on the orientation of the nanocrystal as well as the fifield polarization, which allows for modulating the second-order emission of an arbitrarily oriented nanocrystal by specially tailoring the fifield polarization. We theoretically study SHG and SFG signals produced by nanocrystals driven with broad-bandwidth laser pulses. Several simulations explore the influence of the field polarization and temporal pulse profifile. The latter two factors are decoupled in their influence upon the SHG and SFG signals, and thus polarization and temporal shaping can be independently performed to modulate a nanocrystals's second-order emission. We consider the possibility of enhancing (suppressing) the signal from one nanocrystal among others by choosing the appropriate polarization, thereby opening up the prospect of selectively addressing optically non-linear nanocrystals.
- (160.4330) Materials : Nonlinear optical materials
- (190.2620) Nonlinear optics : Harmonic generation and mixing
- (320.5540) Ultrafast optics : Pulse shaping
- (160.4236) Materials : Nanomaterials
Dirac soliton stability and interaction in binary waveguide arrays
- received 02/06/2014; accepted 03/25/2014; posted 03/25/2014; Doc. ID 206068
- [full text: PDF (371) KB)]
- Abstract: We analyze the stability of a recently found exact analytical spatial soliton in binary waveguide arrays - an analogue of the relativistic Dirac soliton. We demonstrate that this soliton class is very robust. The soliton dynamics and diﬀerent scenarios of soliton interactions are systematically investigated.
- (190.4370) Nonlinear optics : Nonlinear optics, fibers
- (230.7370) Optical devices : Waveguides
- (190.6135) Nonlinear optics : Spatial solitons
Initiating self-focusing of beams carrying spatial phase singularities
- received 01/13/2014; accepted 03/25/2014; posted 03/26/2014; Doc. ID 204455
- [full text: PDF (2294) KB)]
- Abstract: In this work we show both experimentally and by numerical simulations that the presence and evolution of ring dark beam and/or on-axis optical vortex nested on a bright background beam noticeably perturb the host background. In a photorefractive nonlinear medium (crystal SBN) these perturbations can initiate self-focusing of the background. By changing the dark ring radius and the presence/absence of an optical vortex and keeping all other experimental parameters unchanged, we could relatively easily control the dynamics at the initial stage of longitudinal self-focusing and the type of self-focusing structure (single peak or bright ring of variable radius). The presented results may appear especially important in experiments involving cascaded nonlinear frequency mixing of singular beams, in which accelerated dark beam spreading is accompanied by self-focusing of certain portions of the perturbed host beam.
- (190.0190) Nonlinear optics : Nonlinear optics
- (190.4420) Nonlinear optics : Nonlinear optics, transverse effects in
- (190.5330) Nonlinear optics : Photorefractive optics
- (190.5940) Nonlinear optics : Self-action effects
- (080.4865) Geometric optics : Optical vortices
Physical, chemical and optical properties of Er3+-doped low Al(PO3)3 /Al (H2PO4)3 modified fluoroaluminate glasses for 2.7 μm application
- received 02/13/2014; accepted 03/24/2014; posted 03/26/2014; Doc. ID 206425
- [full text: PDF (1449) KB)]
- Abstract: Novel fluoroaluminophosphate glasses with various content of metaphosphate Al(PO3)3 or dihydric phosphate Al(H2PO4)3 were prepared, respectively, to study the change in physical, chemical and optical properties of glasses for 2.7 μm application. The glass forming ability, thermal ability and structural properties were investigated along with the Judd-Ofelt parameters, absorption and emission cross sections were discussed based on the absorption and emission spectra. The glass forming ability and chemical stability ware enhanced with introducing metaphosphate (Al(PO3)3) or dihydric phosphate (Al(H2PO4)3) into the fluoroaluminate glass. The density decreased with the introduction of increased phosphate composition, while the refractive index increased. The absorption coefficient of OH- at about 3 μm dropped noticeably when Al(PO3)3 /Al (H2PO4)3 modified the fluoroaluminate glasses and an enhanced 2.7 μm emission was observed with an optimal content of phosphate composition. These results indicate that these fluoroaluminophosphate glasses with low metaphosphate Al(PO3)3 or dihydric phosphate Al(H2PO4)3 composition are promising candidates for 2.7 μm application.
- (140.0140) Lasers and laser optics : Lasers and laser optics
- (140.3380) Lasers and laser optics : Laser materials
- (260.0260) Physical optics : Physical optics
- (260.2510) Physical optics : Fluorescence
- (260.3060) Physical optics : Infrared
- (300.6340) Spectroscopy : Spectroscopy, infrared
Thermal effects on bipartite and multipartite correlations in fiber coupled cavity arrays
- received 01/14/2014; accepted 03/23/2014; posted 03/24/2014; Doc. ID 204416
- [full text: PDF (349) KB)]
- Abstract: We investigate the thermal influence of fibers on the dynamics of bipartite and multipartite correlations in fiber coupled cavity arrays where each cavity is resonantly coupled to a two-level atom. The atom-cavity systems connected by fibers can be considered as polaritonic qubits. We first derive a master equation to describe the evolution of the atom-cavity systems. The bipartite (multipartite) correlations is measured by concurrence and discord (spin squeezing). Then, we solve the master equation numerically and study the thermal effects on the concurrence, discord, and spin squeezing of qubits. On the one hand, at zero temperature, there are steady-state bipartite and multipartite correlations. One the other hand, the thermal fluctuations of a fiber may blockade the generation of entanglement of two qubits connected directly by the fiber while the discord can be generated and stored for a long time. This thermal-induced blockade effects of bipartite correlations may be useful for quantum information processing. The bipartite correlations of a longer chain of qubits is more robust than a shorter one in the presence of thermal fluctuations.
- (270.2500) Quantum optics : Fluctuations, relaxations, and noise
- (270.5585) Quantum optics : Quantum information and processing
Analytical approach to the design of microring resonators for nonlinear four-wave mixing applications
- received 01/23/2014; accepted 03/23/2014; posted 03/24/2014; Doc. ID 205306
- [full text: PDF (383) KB)]
- Abstract: An analytical approach for obtaining linear and nonlinear design parameters of microresonators is presented. The eigenmode/eigenfrequency problem of planar resonators is considered in detail, with an analytical closed-form approximation derived for resonators possessing a large radius to width ratio. The analysis permits the resonant frequencies and mode profiles to be determined together with the dispersion properties. The dependence of the effective nonlinear Kerr coefficient on the mode volume is further considered, and also the waveguide coupling together with estimates of the Q-value. Examples, which are in good agreement with numerical simulations, are presented for silicon resonators. The approach can be used for designing planar microring resonators for nonlinear four-wave mixing applications such as optical Kerr frequency comb generation.
- (230.5750) Optical devices : Resonators
- (230.7370) Optical devices : Waveguides
- (230.7405) Optical devices : Wavelength conversion devices
- (230.7408) Optical devices : Wavelength filtering devices
Compression of Ultrashort Laser Pulses via Gated Multiphoton Intrapulse Interference Phase Scans
- received 01/24/2014; accepted 03/18/2014; posted 03/19/2014; Doc. ID 205381
- [full text: PDF (1311) KB)]
- Abstract: Delivering femtosecond laser light in the focal plane of a high numerical aperture microscope objective is still a challenge, despite significant developments in the generation of ultrashort pulses. One of the most popular techniques, used to correct phase distortions resulting from propagation through transparent media, is the multiphoton intrapulse interference phase scan (MIIPS). The accuracy of MIIPS however is limited when higher order phase distortions are present. Here we introduce an improvement, called Gated-MIIPS, which avoids shortcomings of MIIPS, reduces the influence of higher order phase terms, and can be used to more efficiently compress broad band laser pulses even with a simple 4f pulse shaper setup. In this work we present analytical formulas for MIIPS and Gated-MIIPS valid for chirped Gaussian pulses; we show an approximated analytic expression for Gated-MIIPS valid for arbitrary pulse shapes; finally we demonstrate the increased accuracy of Gated-MIIPS via experiment and numerical simulation.
- (190.7110) Nonlinear optics : Ultrafast nonlinear optics
- (320.5520) Ultrafast optics : Pulse compression
- (320.5540) Ultrafast optics : Pulse shaping
- (320.7110) Ultrafast optics : Ultrafast nonlinear optics
- (320.7150) Ultrafast optics : Ultrafast spectroscopy
- (180.4315) Microscopy : Nonlinear microscopy
Optical characteristics associated with magnetic resonance in toroidal metamaterials of vertically coupled plasmonic nanodisks
- received 01/28/2014; accepted 03/18/2014; posted 03/21/2014; Doc. ID 205559
- [full text: PDF (2232) KB)]
- Abstract: Magnetic resonance in metamaterials is basically formed by optically induced current loop, which when arranged in a specific order, can exhibit exotic features. In this work, we numerically study the magnetic-resonance-associated optical characteristics in strongly coupled plasmonic nanodisks which are shown to support various magnetic resonances for vertical polarization (E-field out of the disk plane). To identify these modes that are essentially relevant to the optically-induced current loops, we calculate the optical spectrum, the radiation powers from multipole moments, and the resonant magnetic field pattern. It is shown that the lowest-order resonances are sequentially magnetic dipole mode, magnetic quadrupole mode, and toroidal mode. The surface charge density, the induced current density, and the magnetic near-field are carefully examined for these modes, which show that these modes are quite differently located in both spectrum and space, bearing distinct symmetry nature. In view of that, we introduce a concentric and nonconcentric air hole in the disks, as a small perturbation, to tune their resonance. It is found that both the radii of the air hole and its position are capable to shift the resonant frequencies. However, their impacts are interestingly distinct with respect to the mode order. These results can provide a useful way to adjust the optical properties of the metamaterials constructed by double disks.
- (140.4780) Lasers and laser optics : Optical resonators
- (240.6680) Optics at surfaces : Surface plasmons
- (250.5403) Optoelectronics : Plasmonics
Wide-range and tunable diffraction management using two-dimensional rectangular lattice photonic crystals
- received 12/10/2013; accepted 03/14/2014; posted 03/24/2014; Doc. ID 202803
- [full text: PDF (2176) KB)]
- Abstract: We propose that two-dimensional (2D) rectangular lattice photonic crystals composed of dielectric rods can be utilized for wide-range and tunable diffraction management. The control of diffraction for a normally incident beam is achieved by either properly choosing the operating frequency or changing the refractive index of the dielectric rods. The convergent, collimated and divergent beam behaviors corresponding to a wide range of diffraction are clearly illustrated using FDTD simulations. The tunability of diffraction around the frequency of super-collimation is also analyzed and demonstrated.
- (050.5298) Diffraction and gratings : Photonic crystals
- (230.5298) Optical devices : Photonic crystals
Raman random laser in one-dimensional system
- received 01/21/2014; accepted 03/08/2014; posted 04/15/2014; Doc. ID 205128
- [full text: PDF (669) KB)]
- Abstract: The probability of occurrence a resonance frequency of random cavities in the stokes bandwidth of the Raman active medium can causes Raman laser oscillation in Raman random structures. Due to the small bandwidth of Raman line shape, the probability of the simultaneous appearance of random cavity resonance frequencies in the cascade stokes line shapes is so small that the cascade Raman laser oscillation effects on the saturation behavior is negligible. Nonlinear transmission matrix method is employed to determine the statistical behavior of Raman random laser. Our results show that the statistical behavior depends on the position of stokes line shape relative to the center of stopband and edge of passband of the corresponding non-disorder system.
- (140.3460) Lasers and laser optics : Lasers
- (190.5650) Nonlinear optics : Raman effect
- (290.4210) Scattering : Multiple scattering
Modeling of temperature-dependent shift of photoluminescence peak of In(Ga)As quantum dots considering acoustic and optical phonons as two oscillators
- received 10/30/2013; accepted 01/06/2014; posted 02/27/2014; Doc. ID 200325
- [full text: PDF (777) KB)]
- Abstract: We demonstrate that all the available experimental data of temperature (T)-dependent shift of photoluminescence (PL) peak of In(Ga)As quantum dots (QDs) can be fitted successfully by using two-oscillator model if and only if the whole temperature interval is divided to a few parts (at most four parts) depending on dispersion degree from a monotonic behavior. Analysis of the numerical results show that excitons mostly interact (inelastically) with acoustic (AC) or optical (OP) phonons separately. Increasing QDs uniformity, by using some growth techniques, results in removing the sigmoidal behavior, enhancing total AC phonon contribution, and the maximum temperature which AC phonons contribute to the T-dependent red shift of PL peak. Elevation of the number of monolayers (MLs) to a critical value about 1.6 results in enhancement of QD symmetry and total OP phonon contribution and decrease of QDs uniformity and total AC phonon contribution, while a rollover happens for further increase of the number of MLs. Therefore, we find that the highest QD symmetry correspond to this critical value of MLs, in accordance with previous results.
- (250.5230) Optoelectronics : Photoluminescence
- (250.5590) Optoelectronics : Quantum-well, -wire and -dot devices