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The standard and Heisenberg quantum limits on the position accuracy of an optical beam are rigorously derived. A simple scheme of beating the standard quantum limit by self-focusing is proposed.
We report the temporal shaping and nonlocal control of a heralded single-photon wave packet, conditionally prepared by detecting the idler trigger photon of the signal-idler photon pair born in the process of spontaneous parametric down-conversion.
We implement entanglement concentration by the Schmidt projection protocol, known for its optimal efficiency for large number of qubits, using photon pairs entangled in polarization and momentum and employing single-photon two-qubit quantum logic.
We theoretically demonstrate secure signal transfer by optical excitations involving optical near-field interactions. The energy dissipation processes, occurred locally in the nanometer-scale associated with exciton-phonon interactions, guarantees higher tamper resistance than conventional wired devices.
We measured the extinction of a focused light beam by a single 87Rb atom localized in an optical dipole trap and found a value of 7.2% for a focused Gaussian beam resonantly interacting with an atomic two-level system. Various models describing interaction of an atom with a focused light field are compared to explain our experimental result. Our experiment suggests that a strong coupling may be achieved...
We theoretically study possibilities of creating spatial patterns having subwavelength length by using so-called dark states. These dark states are formed via interaction with bichromatic optical fields. Performing experiments in Rb vapor, we experimentally demonstrated spatial patterns that are smaller than the length determined by the diffraction limit of optical system used in the experiment. This...
We design photonic crystal microcavities in diamond films for applications in quantum information yielding high quality factors Q>66000 and small mode volume Vap1.1(lambda/n)3. The calculated quality factors show a strong dependence on material absorption.
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