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We demonstrate quantum entanglement and global spin dynamics between a few trapped ions, using lasers that couple to all modes of transverse motion in a way that could be scaled to large numbers of spins.
A comprehensive theory of couplings between a cavity and different charge configurations in a quantum dot is developed. It is shown that the quantum anti-Zeno effect is essential for the results obtained by QED experiments. The quantum dynamics of the system employing the quantum master equation is analysed. A Stansky-Krastanov InAs QD grown on a GaAs substrate was assumed, and the only first confined...
We show that microring modulators with variable coupling strengths can have low distortion, zero chirp, high extinction ratios, and large modulation rates only limited by the coupler or the free spectral range of the resonator.
Doubly dressed states in a ladder-type two-photon, three-level coupling system are observed in our system. The quantum nature of the EIT system significantly suppresses Doppler broadening. The experiments were performed on a room-temperature atomic cesium cell .The cesium atoms are excited by two linearly polarized fields with parallel polarization. The spacing of the EIT doublet is strongly consistent...
We study theoretically and experimentally the strongly-coupled, nonlinear regime of a hot vapor of three-level atoms in an optical cavity. Interesting effects include lasing without inversion and polariton peak splittings.
We experimentally demonstrate a picogram-scale optomechanical system that increases its mechanical rigidity by more than 5times with the application of mW-level optical power. We discuss the theory and fabrication, making comparisons to existing optomechanical systems.
When using lidar to measure small depolarization values, coupling of polarization planes in the system is of significant concern.We employ hardware polarization compensation to reduce system polarization cross-talk, improving depolarization estimates.
We report on cavity quantum electrodynamics effects in high-Q electrically contacted quantum dot-micropillar cavities. The structures show weak coupling and strong coupling via electrooptical tuning as well as single photon emission and low threshold lasing.
A cladding-modulated Bragg grating implemented using periodic placements of silicon cylinders in the cladding along a silicon waveguide is proposed. Modeling results are verified experimentally, demonstrating coupling strengths differing by an order of magnitude.
The appearance of the two-photon strong-coupling states is analyzed in atomic vs. semi-conductor quantum-dot microcavities. An identical excitation mechanism explains phenomena observed in photon-correlation measurements.
A composite cavity QED system, which couples nitrogen vacancy centers in a diamond nanopillar to whispering gallery modes in a silica microsphere and overcomes limitations of earlier diamond nanocrystal based systems, is demonstrated.
We experimentally observe truly random to non-thermal to thermal distribution of population of InAs quantum dots with temperature using unamplified spontaneous emission and measure the impact on laser operation.
We investigate exciton dynamics in disordered quantum wells with optical two-dimensional Fourier transform spectroscopy (2DFTS). The lack of cross peaks in 2DFTS suggests that excitons localized in spatially separated regions are uncoupled.
We report the observation of up to 5 Rabi cycles in a single molecule. A pi-pulse excitation is achieved with 500 photons, marking an important step towards preparation of coherent superposition states with few photons.
Two-quantum coherences in two-dimensional Fourier-transform (2DFT) spectra are attributed to many-body interactions. 2DFT spectroscopy allows two-quantum coherences in semiconductors to be isolated. As a result, many-body coherences can be separated from biexciton coherences.
A density-matrix based theory of transport and lasing in quantum-cascade lasers reveals that large disparity between lasing linewidth and tunneling broadening changes the design guidelines to favor strong coupling between injector and upper laser level.
Observation of optical spin-Hall effect that appears when a wave carrying spin angular momentum interacts with plasmonic nanostructures is presented. The measurements verify the geometric phase, demonstrated by the spin-dependent deflection of the surface waves.
We report a drastic coupling reduction between orthogonal modes of a Nd:YAG laser when the gain crystal is cut along the <100> axis instead of <111>. Our measurements are accurately described by a simple theoretical model.
We observe critically coupled surface phonon-polariton excitation in SiC, leading to maximum electric field enhancement. A double-scan of wavelength and incidence angle in the ATR configuration demonstrates critical coupling for two air gaps.
Optical responses of metal nano-aperture probes for the electric and the magnetic field polarization are investigated with radially and azimuthally polarized lights.
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