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      Modelling of Output Statistics of Single and -Mode Straight and Curved :Ti:LiNb Waveguide Amplifiers

      Advances in OptoElectronics
      Hindawi Limited

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          Abstract

          A theoretical analysis of some statistical parameters which characterize the -doped Ti:LiNbO 3single and -mode straight and curved waveguides is presented in this paper. In the derivation and the evaluation of the spectral optical quality factor, the power spectral density, the Fano factor, the statistical fluctuation, and the spontaneous emission factor we used the small gain approximation, and the photon statistics master equation of the linear amplifier (considering that the photon number distribution is determined by the normalized mode intensity profiles which are not uniform in the transversal section of the waveguide), transposed to the case of straight and curved amplifiers. The simulation results show the evolution of the above-mentioned parameters under various pump regimes and waveguide lengths.

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          Erbium-doped single- and double-pass Ti:LiNbO/sub 3/ waveguide amplifiers

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            Photon statistics of a contradirectional nonlinear coupler

            J. Perina (1995)
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              Modal and Polarization Qubits in Ti:LiNbO\(_3\) Photonic Circuits for a Universal Quantum Logic Gate

              Lithium niobate photonic circuits have the salutary property of permitting the generation, transmission, and processing of photons to be accommodated on a single chip. Compact photonic circuits such as these, with multiple components integrated on a single chip, are crucial for efficiently implementing quantum information processing schemes. We present a set of basic transformations that are useful for manipulating modal qubits in Ti:LiNbO\(_3\) photonic quantum circuits. These include the mode analyzer, a device that separates the even and odd components of a state into two separate spatial paths; the mode rotator, which rotates the state by an angle in mode space; and modal Pauli spin operators that effect related operations. We also describe the design of a deterministic, two-qubit, single-photon, CNOT gate, a key element in certain sets of universal quantum logic gates. It is implemented as a Ti:LiNbO\(_3\) photonic quantum circuit in which the polarization and mode number of a single photon serve as the control and target qubits, respectively. It is shown that the effects of dispersion in the CNOT circuit can be mitigated by augmenting it with an additional path. The performance of all of these components are confirmed by numerical simulations. The implementation of these transformations relies on selective and controllable power coupling among single- and two-mode waveguides, as well as the polarization sensitivity of the Pockels coefficients in LiNbO\(_3\).
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                Author and article information

                Journal
                Advances in OptoElectronics
                Advances in OptoElectronics
                Hindawi Limited
                1687-563X
                1687-5648
                2011
                2011
                : 2011
                :
                : 1-6
                Article
                10.1155/2011/368327
                ce2b4a65-b1df-4af9-9054-baacc8062553
                © 2011

                http://creativecommons.org/licenses/by/3.0/

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