6,115 research outputs found

    Many-agent controlled teleportation of multi-qubit quantum information

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    We present a general idea to construct methods for multi-qubit quantum teleportation between two remote parties with control of many agents in the network. Our methods seem to be much simpler than the existing method proposed recently (Phys. Rev. A {\bf 70}, 022329(2004)). We then demonstrate our idea by using several different protocols of quantum key distribution, including Ekert 91 and the deterministic secure communication protocol raised by Deng and Long.Comment: This paper has been accepted for publication in Phys. Lett.

    Local Composite Quantile Regression for Regression Discontinuity

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    We introduce the local composite quantile regression (LCQR) to causal inference in regression discontinuity (RD) designs. Kai et al. (2010) study the efficiency property of LCQR, while we show that its nice boundary performance translates to accurate estimation of treatment effects in RD under a variety of data generating processes. Moreover, we propose a bias-corrected and standard error-adjusted t-test for inference, which leads to confidence intervals with good coverage probabilities. A bandwidth selector is also discussed. For illustration, we conduct a simulation study and revisit a classic example from Lee (2008). A companion R package rdcqr is developed

    Multiparty Quantum Secret Sharing

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    Based on a quantum secure direct communication (QSDC) protocol [Phys. Rev. A69(04)052319], we propose a (n,n)(n,n)-threshold scheme of multiparty quantum secret sharing of classical messages (QSSCM) using only single photons. We take advantage of this multiparty QSSCM scheme to establish a scheme of multiparty secret sharing of quantum information (SSQI), in which only all quantum information receivers collaborate can the original qubit be reconstructed. A general idea is also proposed for constructing multiparty SSQI schemes from any QSSCM scheme

    [N,N,N′,N′-Tetra­kis(benzimidazol-2-yl­meth­yl)ethane-1,2-diamine]copper(II) sulfate monohydrate

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    In the title compound, [Cu(C34H32N10)]SO4·H2O, the CuII ion is coordinated by six N atoms of a hexa­dentate N,N,N′,N′-tetra­kis(benzimidazol-2-ylmeth­yl)ethane-1,2-diamine (EDTB) ligand, in a distorted octa­hedral environment. In the crystal structure, inter­molecular N—H⋯O and weak C—H⋯O hydrogen bonds connect the cations, anions and water mol­ecules into a three-dimensional network. The O atoms of the anion are disordered over two sites with refined occupancies of 0.711 (2) and 0.289 (2)

    5-(Dimethyl­ammonio)naphthalene-1-sulfonate dihydrate

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    There are two formula units in the asymmetric unit of the title compound, C12H13NO3S·2H2O. In the crystal structure, mol­ecules are linked by inter­molecular O—H⋯O, N—H⋯O and weak C—H⋯O hydrogen bonds, forming a three-dimensional network
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