653 research outputs found
Dynamics of Bloch vectors and the channel capacity of a non identical charged qubit pair
We have considered a system of two superconducting charge qubits capacitively
coupled to a microwave resonator. The dynamics of the Bloch vectors are
investigated for different regimes. By means of the Bloch vectors and cross
dyadic we quantify the degree of entanglement contained in the generated
entangled state. We consider different values of the system parameters to
discuss the dynamics of the channel capacity between the qubits. We show that
there is an important role played by initial state settings, coupling constant
and the mean photon number on generating entangled state with high degree of
entanglement and high capacity
Recurrence Relations for Moments of Dual Generalized Order Statistics from Weibull Gamma Distribution and Its Characterizations
In this paper, we establish explicit forms and new recurrence relations satisfied by the single and product moments of dual generalized order statistics from Weibull gamma distribution (WGD). The results include as particular cases the relations for moments of reversed order statistics and lower records.We present characterizations ofWGD based on (i) recurrence relation for single moments, (ii) truncated moments of certain function of the variable and (iii) hazrad function
Generation of three-qubit entangled states using coupled multi-quantum dots
We discuss a mechanism for generating a maximum entangled state (GHZ) in a
coupled quantum dots system, based on analytical techniques. The reliable
generation of such states is crucial for implementing solid-state based quantum
information schemes. The signature originates from a remarkably weak field
pulse or a far off-resonance effects which could be implemented using
technology that is currently being developed. The results are illustrated with
an application to a specific wide-gap semiconductor quantum dots system, like
Zinc Selenide (ZnSe) based quantum dots.Comment: 8 pages, 2 figure
Controlling the quantum computational speed
The speed of quantum computation is investigated through the time evolution
of the speed of the orthogonality. The external field components for classical
treatment beside the detuning and the coupling parameters for quantum treatment
play important roles on the computational speed. It has been shown that the
number of photons has no significant effect on the speed of computation.
However, it is very sensitive to the variation in both detuning and the
interaction coupling parameters.Comment: 9 pages, 10 figure
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