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Ladder operators are introduced to analyze the Pancharatnam-Berry(PB) phase. Space-variant PB phase structures are identified in polarization grating and cholesteric liquid crystal. The wavefront shaping and the beam propagation direction alteration are demonstrated.
Optoelectronic tweezers (OET) allow the control of micron-sized particles suspended in a liquid by controlling the dielectrophoretic force with the selective illumination of a photoconductor. High liquid conductivities give a negative force (away from illuminated areas) so that particles are trapped by illuminating a ring around them. This paper explores the force profile of these traps and shows...
We compare single photon generation from quantum dots emitting into a two-dimensional photonic bandgap and a nanocavity mode using auto and cross-correlation spectroscopy. Quantum correlations are observed, even for detunings > 12 meV, indicating the presence of a remote optical coupling mechanism.
We report a differential phase shift quantum key distribution experiment using up-conversion detectors. Though the detectors had polarization dependency, we were able to make the system polarization-independent by using polarization modulation.
We report entanglement generation in atomic quantum memories via deterministic mapping of photonic entanglement. The atomic entanglement is retrieved back into photon modes after a programmable storage time, with an overall efficiency of 17%.
We report an experiment on preparation and characterization of general four-dimensional quantum states using ultrafast-pumped frequency-nondegenerate spontaneous parametric down-conversion. We also discuss two additional experimental schemeswhich offermore complete control of the state purity and entropy.
We review the merits of using fiber as a nonlinear media for production of correlated and entangled photon pairs for quantum information applications and we present history, status, and fruits of efforts in this area.
We present a new scheme of a photon-resolving measurement with a superconducting microbolometer. Based on known ldquoinstrumental functionrdquo of the microbolometer, we convert its analog output into a digitized record of photon detections without deadtime.
We present the first experimental generation of 1.5-mum band polarization entanglement based on spontaneous four-wave mixing in a silicon wire waveguide. Two-photon interference fringes with >83% visibilities were successfully obtained.
We demonstrate a bright, narrowband, compact single-crystal source of polarization entangled photon pairs at non-degenerate wavelength. This work is instrumental for quantum key distribution and entanglement transfer from photonic to atomic qubits.
We test local realistic and non-local realistic theories using a fiber-based source of polarization-entangled photons. Our measurements violate local (certain non-local) hidden-variable theories by 15 (Leggett, A.) standard deviations.
We generate hyperentangled (time-bin and polarization) photon-pairs using a microstructure-fiber Sagnac interferometer. Two-photon interference visibilities in both degrees of freedom are > 84%, and Bellpsilas inequality is violated by 27 sigma at 1-kHz coincidence rate.
We present crystalline whispering gallery mode resonators (WGMR) operating as the efficient Raman lasers. Fundamental limitations on optical quality (Q) factor are discussed. A new resonant scattering phenomenon is observed.
The vertical and horizontal polarization modes of a cavity QED system become correlated through a single atom. Their auto-correlation and cross-correlations show an avenue for the study of the steady state entanglement in this system.
We show that attenuated N00N states lead to a worse phase estimate than an equally attenuated N separable state unless the transmittance of the medium is very high.
We employ quantum trajectory theory to model temporally and spatially resolved photodetection of collective emission to investigate the performance of a conditional quantum teleportation protocol. The fidelity approaches unity with a success probability of 0.25.
Quantum networks require the reliable encoding of quantum information in narrow-band single photons which couple efficiently to transitions in atomic ensembles. We show time-bin encoding for photons of 10 MHz width via unbalanced Michelson interferometers and show the applicability of our scheme in a quantum key distribution experiment.
We develop a fully quantum-mechanical approach for describing spontaneous parametric down-conversion, which allows us to write an expression for the quantum state easily, even when multiple photon pairs are generated in the process.
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