Zobrazeno 1 - 10
of 130
pro vyhledávání: '"Wellard C"'
We demonstrate how using two-qubit composite rotations a high fidelity controlled-NOT (CNOT) gate can be constructed, even when the strength of the interaction between qubits is not accurately known. We focus on the exchange interaction oscillation i
Externí odkaz:
http://arxiv.org/abs/quant-ph/0701165
We theoretically investigate cross-talk in hyperfine gate control of donor-qubit quantum computer architectures, in particular the Kane proposal. By numerically solving the Poisson and Schr\"{o}dinger equations for the gated donor system, we calculat
Externí odkaz:
http://arxiv.org/abs/cond-mat/0605081
We present a theoretical analysis of a microwave spectroscopy experiment on a charge qubit defined by a P$_2^+$ donor pair in silicon, for which we calculate Hamiltonian parameters using the effective-mass theory of shallow donors. We solve the maste
Externí odkaz:
http://arxiv.org/abs/cond-mat/0512107
The proposed read-out configuration D+D- for the Kane Si:P architecture[Nature 393, 133 (1998)] depends on spin-dependent electron tunneling between donors, induced adiabatically by surface gates. However, previous work has shown that since the doubl
Externí odkaz:
http://arxiv.org/abs/cond-mat/0507091
Publikováno v:
Physical Review B 74, 045311 (2006)
Through the introduction of a new electron spin transport mechanism, a 2D donor electron spin quantum computer architecture is proposed. This design addresses major technical issues in the original Kane design, including spatial oscillations in the e
Externí odkaz:
http://arxiv.org/abs/quant-ph/0506198
Autor:
Wellard, C. J., Hollenberg, L. C. L.
We calculate the electronic wave-function for a phosphorus donor in silicon by numerical diagonalisation of the donor Hamiltonian in the basis of the pure crystal Bloch functions. The Hamiltonian is calculated at discrete points localised around the
Externí odkaz:
http://arxiv.org/abs/cond-mat/0504126
Autor:
Hill, Charles D., Hollenberg, L. C. L., Fowler, A. G., Wellard, C. J., Greentree, A. D., Goan, H. -S.
Publikováno v:
Physical Review B 72, 045350 (2005)
We propose a scheme for quantum information processing based on donor electron spins in semiconductors, with an architecture complementary to the original Kane proposal. We show that a naive implementation of electron spin qubits provides only modest
Externí odkaz:
http://arxiv.org/abs/quant-ph/0411104
Motivated by applications to quantum computer architectures we study the change in the exchange interaction between neighbouring phosphorus donor electrons in silicon due to the application of voltage biases to surface control electrodes. These volta
Externí odkaz:
http://arxiv.org/abs/cond-mat/0402642
Publikováno v:
Physical Review B 69, 233301 (2004)
In the design of quantum computer architectures that take advantage of the long coherence times of dopant nuclear and electron spins in the solid-state, single-spin detection for readout remains a crucial unsolved problem. Schemes based on adiabatica
Externí odkaz:
http://arxiv.org/abs/quant-ph/0402077
Publikováno v:
J. Phys.: Cond. Matter, 16, 1011, (2004)
We calculate the electron exchange coupling for a phosphorus donor pair in silicon perturbed by a J-gate potential and the boundary effects of the silicon host geometry. In addition to the electron-electron exchange interaction we also calculate the
Externí odkaz:
http://arxiv.org/abs/cond-mat/0402183