Zobrazeno 1 - 10
of 108
pro vyhledávání: '"Havel T"'
Publikováno v:
Phys. Rev. A 75, 042321 (2007)
A critical step in experimental quantum information processing (QIP) is to implement control of quantum systems protected against decoherence via informational encodings, such as quantum error correcting codes, noiseless subsystems and decoherence fr
Externí odkaz:
http://arxiv.org/abs/quant-ph/0610269
Publikováno v:
Phys. Rev. A 75, 042320 (2007)
Liquid phase NMR is a general purpose test-bed for developing methods of coherent control relevant to quantum information processing. Here we extend these studies to the coherent control of logical qubits and in particular to the unitary gates necess
Externí odkaz:
http://arxiv.org/abs/quant-ph/0611004
Publikováno v:
J. Chem. Phys. 125, 044514 (2006)
Decoherence-Free Subsystems (DFS) are a powerful means of protecting quantum information against noise with known symmetry properties. Although Hamiltonians theoretically exist that can implement a universal set of logic gates on DFS encoded qubits w
Externí odkaz:
http://arxiv.org/abs/quant-ph/0604203
Autor:
Negrevergne, C., Mahesh, T. S., Ryan, C. A., Ditty, M., Cyr-Racine, F., Power, W., Boulant, N., Havel, T., Cory, D. G., Laflamme, R.
In this letter, we present an experimental benchmark of operational control methods in quantum information processors extended up to 12 qubits. We implement universal control of this large Hilbert space using two complementary approaches and discuss
Externí odkaz:
http://arxiv.org/abs/quant-ph/0603248
Publikováno v:
J. of Chem. Phys. 121, 2955-2961 (2004).
Incoherence in the controlled Hamiltonian is an important limitation on the precision of coherent control in quantum information processing. Incoherence can typically be modelled as a distribution of unitary processes arising from slowly varying expe
Externí odkaz:
http://arxiv.org/abs/quant-ph/0312116
Autor:
Teklemariam, G., Fortunato, E. M., Lopez, C. C., Emerson, J., Paz, J. P., Havel, T. F., Cory, D. G.
Publikováno v:
Phys. Rev. A 67, 062316 (2003)
We develop and implement a method for modeling decoherence processes on an N-dimensional quantum system that requires only an $N^2$-dimensional quantum environment and random classical fields. This model offers the advantage that it may be implemente
Externí odkaz:
http://arxiv.org/abs/quant-ph/0303115
We present a robust method for quantum process tomography, which yields a set of Lindblad operators that optimally fit the measured density operators at a sequence of time points. The benefits of this method are illustrated using a set of liquid-stat
Externí odkaz:
http://arxiv.org/abs/quant-ph/0211046
Autor:
Laflamme, R., Knill, E., Cory, D. G., Fortunato, E. M., Havel, T., Miquel, C., Martinez, R., Negrevergne, C., Ortiz, G., Pravia, M. A., Sharf, Y., Sinha, S., Somma, R., Viola, L.
After a general introduction to nuclear magnetic resonance (NMR), we give the basics of implementing quantum algorithms. We describe how qubits are realized and controlled with RF pulses, their internal interactions, and gradient fields. A peculiarit
Externí odkaz:
http://arxiv.org/abs/quant-ph/0207172
Publikováno v:
Phys. Rev. Lett. 86(2001), 5845-5849.
We report the implementation of a three-spin quantum disentanglement eraser on a liquid-state NMR quantum information processor. A key feature of this experiment was its use of pulsed magnetic field gradients to mimic projective measurements. This ab
Externí odkaz:
http://arxiv.org/abs/quant-ph/0104131
Autor:
Cory, D. G., Laflamme, R., Knill, E., Viola, L., Havel, T. F., Boulant, N., Boutis, G., Fortunato, E., Lloyd, S., Martinez, R., Negrevergne, C., Pravia, M., Sharf, Y., Teklemariam, G., Weinstein, Y. S., Zurek, W. H.
Nuclear magnetic resonance (NMR) provides an experimental setting to explore physical implementations of quantum information processing (QIP). Here we introduce the basic background for understanding applications of NMR to QIP and explain their curre
Externí odkaz:
http://arxiv.org/abs/quant-ph/0004104