222 research outputs found
Comment on "Quantum waveguide array generator for performing Fourier transforms: Alternate route to quantum computing"
A Comment on the paper "Quantum waveguide array generator for performing
Fourier transforms: Alternate route to quantum computing" by R. Akis and D.K.
Ferry, Appl. Phys. Lett. 79, 2823 (2001). The authors reply in Appl. Phys.
Lett. 80, 2420 (2002).Comment: 1 pag
Entangling capacities of noisy two-qubit Hamiltonians
We show that intrinsic fluctuations in system control parameters impose
limits on the ability of two-qubit (exchange) Hamiltonians to generate
entanglement starting from mixed initial states. We find three classes for
Gaussian and Laplacian fluctuations. For the Ising and XYZ models there are
qualitatively distinct sharp entanglement-generation transitions, while the
class of Heisenberg, XY, and XXZ Hamiltonians is capable of generating
entanglement for any finite noise level. Our findings imply that exchange
Hamiltonians are surprisingly robust in their ability to generate entanglement
in the presence of noise, thus potentially reducing the need for quantum error
correction.Comment: 5 pages, incl. 2 figures. replaced with published versio
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