Zobrazeno 1 - 10
of 47
pro vyhledávání: '"James*, D. F. V."'
We investigate the change of entanglement of photons due to propagation. We find that post-selected entanglement in general varies by propagation and, as a consequence, states with maximum bi- and tri-partite entanglement can be generated from propag
Externí odkaz:
http://arxiv.org/abs/0903.0389
Autor:
Stock, R., James, D. F. V.
Publikováno v:
Phys. Rev. Lett. 102, 170501 (2009)
We describe a scalable, high-speed, and robust architecture for measurement-based quantum-computing with trapped ions. Measurement-based architectures offer a way to speed-up operation of a quantum computer significantly by parallelizing the slow ent
Externí odkaz:
http://arxiv.org/abs/0808.1591
Autor:
Lanyon, B. P., Weinhold, T. J., Langford, N. K., Barbieri, M., James*, D. F. V., Gilchrist, A., White, A. G.
Publikováno v:
Physical Review Letters 99, 250505 (2007)
Shor's powerful quantum algorithm for factoring represents a major challenge in quantum computation and its full realization will have a large impact on modern cryptography. Here we implement a compiled version of Shor's algorithm in a photonic syste
Externí odkaz:
http://arxiv.org/abs/0705.1398
Publikováno v:
Phys. Rev. A 77, 040302(R) (2008)
We experimentally investigate nonlinear couplings between vibrational modes of strings of cold ions stored in linear ion traps. The nonlinearity is caused by the ions' Coulomb interaction and gives rise to a Kerr-type interaction Hamiltonian H = n_r*
Externí odkaz:
http://arxiv.org/abs/0705.0788
Autor:
Wei, Tzu-Chieh, Altepeter, Joseph B., Branning, David, Goldbart, Paul M., James, D. F. V., Jeffrey, Evan, Kwiat, Paul G., Mukhopadhyay, Swagatam, Peters, Nicholas A.
Publikováno v:
Phys. Rev. A 71, 032329 (2005)
Two methods for creating arbitrary two-photon polarization pure states are introduced. Based on these, four schemes for creating two-photon polarization mixed states are proposed and analyzed. The first two schemes can synthesize completely arbitrary
Externí odkaz:
http://arxiv.org/abs/quant-ph/0501115
Autor:
O'Brien, J. L., Pryde, G. J., Gilchrist, A., James, D. F. V., Langford, N. K., Ralph, T. C., White, A. G.
Publikováno v:
Phys.Rev.Lett.93:080502,2004
We demonstrate complete characterization of a two-qubit entangling process - a linear optics controlled-NOT gate operating with coincident detection - by quantum process tomography. We use maximum-likelihood estimation to convert the experimental dat
Externí odkaz:
http://arxiv.org/abs/quant-ph/0402166
Publikováno v:
Phys. Lett. A, vol. 300, pp. 569-576 (2002)
Characterizing entanglement in all but the simplest case of a two qubit pure state is a hard problem, even understanding the relevant experimental quantities that are related to entanglement is difficult. It may not be necessary, however, to quantify
Externí odkaz:
http://arxiv.org/abs/quant-ph/0208007
Publikováno v:
Physical Review A 65, 012301 (2002)
We report the creation of a wide range of quantum states with controllable degrees of entanglement and entropy using an optical two-qubit source based on spontaneous parametric downconversion. The states are characterised using measures of entangleme
Externí odkaz:
http://arxiv.org/abs/quant-ph/0108088
Publikováno v:
Physical Review A 64, 030302 (2001)
Two-qubit states occupy a large and relatively unexplored Hilbert space. Such states can be succinctly characterized by their degree of entanglement and purity. In this letter we investigate entangled mixed states and present a class of states that h
Externí odkaz:
http://arxiv.org/abs/quant-ph/0103113
When an ion confined in a linear ion trap interacts with a coherent laser field, the internal degrees of freedom, related to the electron transitions, couple to the vibrational degree of freedom of the ion. As a result of this interaction, quantum dy
Externí odkaz:
http://arxiv.org/abs/quant-ph/0012098