Qubit State

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The Experts below are selected from a list of 37230 Experts worldwide ranked by ideXlab platform

Ming-huang Sang - One of the best experts on this subject based on the ideXlab platform.

Yi-you Nie - One of the best experts on this subject based on the ideXlab platform.

Ramon Muñoz-tapia - One of the best experts on this subject based on the ideXlab platform.

  • Optimal reconstruction of a pure Qubit State with local measurements
    arXiv: Quantum Physics, 2003
    Co-Authors: Emilio Bagan, Mukarram Baig, Alex Monras, Ramon Muñoz-tapia
    Abstract:

    We analyse the reconstruction of an unknown pure Qubit State. We derive the optimal guess that can be inferred from any set of measurements on N identical copies of the system with the fidelity as a figure of merit. We study in detail the estimation process with individual von Neumann measurements and demonstrate that they are very competitive as compared to (complicated) collective measurements. We compute the expressions of the fidelity for large $N$ and show that individual measurement schemes can perform optimally in the asymptotic regime.

  • Optimal scheme for estimating a pure Qubit State via local measurements.
    Physical review letters, 2002
    Co-Authors: Emilio Bagan, Mukarram Baig, Ramon Muñoz-tapia
    Abstract:

    We present the optimal scheme for estimating a pure Qubit State by means of local measurements on N identical copies. We give explicit examples for low N. For large N, we show that the fidelity saturates the collective measurement bound up to order 1/N. When the signal State lays on a meridian of the Bloch sphere, we show that this can be achieved without classical communication.

Jun-chang Liu - One of the best experts on this subject based on the ideXlab platform.

Shouqi Sheng - One of the best experts on this subject based on the ideXlab platform.

  • an efficient scheme for five party quantum State sharing of an arbitrary m Qubit State using multiQubit cluster States
    Quantum Information Processing, 2011
    Co-Authors: Kui Hou, Guohong Liu, Xueyong Zhang, Shouqi Sheng
    Abstract:

    We present an efficient scheme for five-party quantum State sharing (QSTS) of an arbitrary m-Qubit State with multiQubit cluster States. Unlike the three-partite QSTS schemes using the same quantum channel [Phys. Rev. A 78, 062333 (2008)], our scheme for sharing of quantum information among five parties utilizing a cluster State as an entangled resource. It is found that the six-partite cluster State can be used for QSTS of an entangled State, the five-partite cluster State can be used for QSTS of an arbitrary two-Qubit State and also can be used for QSTS of an arbitrary m-Qubit State. It involves two-Qubit Bell-basis or three-Qubit GHZ-basis measurements, not multipartite joint measurements, which makes it more convenient than some previous schemes. In addition, the total efficiency really approaches the maximal value.