Zobrazeno 1 - 10
of 33
pro vyhledávání: '"Vollbrecht, K. G. H."'
Publikováno v:
Phys. Rev. A 81, 043832 (2010)
We propose and analyze a multi-functional setup consisting of high finesse optical cavities, beam splitters, and phase shifters. The basic scheme projects arbitrary photonic two-mode input states onto the subspace spanned by the product of Fock state
Externí odkaz:
http://arxiv.org/abs/1002.0127
Autor:
Vollbrecht, K. G. H., Cirac, J. I.
We propose a scheme for performing quantum simulations with atoms in cavities based on a photon detection feedback loop that requires only linear optical elements. Atoms can be stored individually without the need of directly interacting with one ano
Externí odkaz:
http://arxiv.org/abs/0811.1844
Autor:
Perseguers, S., Jiang, L., Schuch, N., Verstraete, F., Lukin, M. D., Cirac, J. I., Vollbrecht, K. G. H.
Publikováno v:
Phys. Rev. A 78, 062324 (2008)
We consider the problem of creating a long-distance entangled state between two stations of a network, where neighboring nodes are connected by noisy quantum channels. We show that any two stations can share an entangled pair if the effective probabi
Externí odkaz:
http://arxiv.org/abs/0807.0208
Autor:
Vollbrecht, K. G. H., Cirac, J. I.
Publikováno v:
Phys. Rev. Lett. 100, 010501 (2008)
The general problem of finding the ground state energy of lattice Hamiltonians is known to be very hard, even for a quantum computer. We show here that this is the case even for translationally invariant systems. We also show that a quantum computer
Externí odkaz:
http://arxiv.org/abs/0704.3432
Autor:
Vollbrecht, K. G. H., Cirac, J. I.
Publikováno v:
Phys. Rev. Lett. 98, 190502 (2007)
We show how to detect and quantify entanglement of atoms in optical lattices in terms of correlations functions of the momentum distribution. These distributions can be measured directly in the experiments. We introduce two kinds of entanglement meas
Externí odkaz:
http://arxiv.org/abs/quant-ph/0611132
Publikováno v:
New J. Phys. 8, 164 (2006)
We propose and analyze several schemes for cooling bosonic and fermionic atoms in an optical lattice potential close to the ground state of the no-tunnelling regime. Some of the protocols rely on the concept of algorithmic cooling, which combines occ
Externí odkaz:
http://arxiv.org/abs/cond-mat/0605198
Publikováno v:
Phys. Rev. A 74, 013622 (2006)
We propose two schemes for cooling bosonic and fermionic atoms that are trapped in a deep optical lattice. The first scheme is a quantum algorithm based on particle number filtering and state dependent lattice shifts. The second protocol alternates f
Externí odkaz:
http://arxiv.org/abs/cond-mat/0603859
Autor:
Vollbrecht, K. G. H., Cirac, J. I.
Publikováno v:
Phys. Rev. A 73, 012324 (2006)
We show how to perform reversible universal quantum computation on a translationally invariant pure state, using only global operations based on next-neighbor interactions. We do not need not to break the translational symmetry of the state at any ti
Externí odkaz:
http://arxiv.org/abs/quant-ph/0502143
Publikováno v:
Phys. Rev. Lett. 93, 220502 (2004)
We show how to perform universal quantum computation with atoms confined in optical lattices which works both in the presence of defects and without individual addressing. The method is based on using the defects in the lattice, wherever they are, bo
Externí odkaz:
http://arxiv.org/abs/quant-ph/0405014
Publikováno v:
Phys. Rev. A 69, 062304 (2004)
We investigate the irreversibility of entanglement distillation for a symmetric d-1 parameter family of mixed bipartite quantum states acting on Hilbert spaces of arbitrary dimension d x d. We prove that in this family the entanglement cost is generi
Externí odkaz:
http://arxiv.org/abs/quant-ph/0301072