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We will give an overview of recently observed analogies between the transport of electrons and light waves and show how complex photonic materials, ranging from periodic to disordered structures can be applied as photonic devices.
We present photon-spin quantum-state-transfer (QST) approach. GaAs/AlGaAs-QW with g~0 showed nonlinear B-field dependence of spin precession, suggesting photon-to-nuclei polarization transfer. 2DEG with quantum-point-contact on InGaAs/InP showed telecomwavelength-sensitive quantum transport. Efficient/high-fidelity QST conditions were also found.
Stimulated THz emission from intra-excitonic 3p to 2s transitions in Cu2O is directly observed by ultrafast opto-electronics. The process occurs at a photon energy of 6.6 meV, with a cross section of ~10-14 cm2.
We show that periodic nanostructure made of alternating layers of Ag and Mo can serve as an efficient source of hard X-ray transition radiation for medical applications, which uses low energy electrons.
Time coding quantum key distribution is analysed considering optimal individual attacks based on intrication. Security can be guaranteed in case of setup imperfections and for quantum bit error rates up to 12 %.
We propose a quantum key distribution scheme using the spatial properties of the entangled photon pairs generated from parametric downconversion. The security of this scheme is guaranteed by the distributed entanglement.
We designed photonic crystal cavities for coupling to colloidal quantum dots suspended in a polymer film. We experimentally observe the coupling of quantum dot emission to cavity modes at room temperature.
We observe entanglement of two remote atomic qubits, by generating entangled state of an atomic qubit and a single photon, transmitting the photon to an adjacent laboratory, and converting the photon into an atomic qubit.
We have observed quantum interference currents by exciting exciton transitions in GaAs quantum wells. A phase shift of the current occurs when tuning the exciting photon energy from the heavy hole to the light hole exciton transition.
An experiment is proposed for performing adaptive phase measurements on a continuous squeezed beam such that the variance is below the standard quantum limit. The theory takes into account many issues ignored in previous work.
We report on the scalable and deterministic generation and tomographic characterization of entangled states of up to 8 trapped ions and experiments towards entangling ions and photons.
It is shown that the rate of two-photon absorption can be greatly reduced by the generation of entangled photon holes that are analogous to the holes of semiconductor theory.
Full quantum theory of the optical two-qubit quantum phase gate for single photons is formulated. Trade-off between the conditional phase shift and gate fidelity is found, but could be compensated in transient regime.
We report our progress towards the realization of a tunable and narrow-band source of correlated photons for coherent manipulation of cold atoms, using a combination of four-wave mixing and electromagnetically induced transparency.
We simulate an evolutionary process for designing a novel high confinement photonic structure, starting with random patterns. We show an emergence of periodicity and the formation of a novel low modal volume resonator.
Homodyne measurement of mean photon number within an optical sideband is performed and discussed. Comparison with single photon detector data illustrates the versatility of the technique and supports a quantum mechanical description of vacuum noise.
We study the quantum state transfer (QST) from a photon polarization to an electron spin. We reveal the condition for high-yield and high-fidelity QST by solving the time-dependent Schrodinger equation.
We theoretically present that generation of entangled-photon pairs from biexcitons in a quantum well is dramatically enhanced by using a microcavity. Itpsilas optimal condition is qualitatively understood from the characteristic feature of the cavity QED.
We theoretically show that the effects of the carrier-envelope-phase is significant even in the multiphoton ionization regime with an essential difference on the phase-dependent dynamics compared with the tunneling ionization regime.
We report on strong coupling between a discrete optical mode of a high-Q micropillar cavity and single excitons of self assembled In0.43Ga0.57As quantum dots and compare the results with previous studies on In0.3Ga0.7As quantum dots.
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