Creating p-wave superfluids and topological excitations in optical lattices (2009)
Massignan, P., Sanpera, A., Lewenstein, M.
We propose to realize an unconventional p-wave superfluid using spinless fermions coexisting with bosons in a deep optical lattice. We analyze its excitations in two dimensions in presence of a...
Josephson oscillations in binary mixtures of F=1 spinor BECs (2009)
Julia-Diaz, B., Guilleumas, M., Lewenstein, M., Polls, A., Sanpera, A.
We study Josephson oscillations of a two component Bose-Einstein condensate (BEC) in a double well-potential. We demonstrate that in the strongly polarized case, the less populated component exhibits...
Quantum polarization spectroscopy of correlations in attractive fermionic gases (2009)
Roscilde, T., Rodriguez, M., Eckert, K., Romero-Isart, O., Lewenstein, M., Polzik, E., ...
We show how spin-spin correlations, detected in a non-destructive way via spatially resolved quantum polarization spectroscopy, strongly characterize various phases realized in trapped ultracold...
Double barrier potentials for matter-wave gap solitons (2008)
Ahufinger, V., Malomed, B. A., Birkl, G., Corbalan, R., Sanpera, A.
We investigate collisions of solitons of the gap type, supported by a lattice potential in repulsive Bose-Einstein condensates, with an effective double-barrier potential that resembles a Fabry-Perot...
A. V. Sergienko, M. C. Teich, D. Bruß, M. Lewenstein, A. Sanpera, ...
References 1. Web-based versions of this bibliography with direct weblinks to most of its entries are available at the Springer website
Multipartite Continuous Variable Solution for the Byzantine Agreement Problem (2007)
Neigovzen, Rodion, Rodó, C., Adesso, Gerardo, Sanpera, A.
We demonstrate that the Byzantine Agreement (detectable broadcast) is also solvable in the continuous-variable scenario with multipartite entangled Gaussian states and Gaussian operations (homodyne...
Operational Quantification of Continuous Variable Correlations (2007)
Rodó, C., Adesso, Gerardo, Sanpera, A.
We quantify correlations (quantum and/or classical) between two continuous variable modes in terms of how many correlated bits can be extracted by measuring the sign of two local quadratures. On...
Transport and Entanglement Generation in the Bose-Hubbard Model (2007)
Romero-Isart, O., Eckert, K., Rodó, C., Sanpera, A.
We study entanglement generation via particle transport across a one-dimensional system described by the Bose-Hubbard Hamiltonian. We analyze how the competition between interactions and tunneling...
Efficient quantum state transfer in spin chains via adiabatic passage (2007)
Eckert, K., Romero-Isart, O., Sanpera, A.
We propose a method for quantum state transfer in spin chains using an adiabatic passage technique. Modifying even and odd nearest-neighbour couplings in time allows to achieve transfer fidelities...
Quantum switches and quantum memories for matter-wave lattice solitons (2006)
Ahufinger, V., Mebrahtu, A., Corbalan, R., Sanpera, A.
We study the possibility of implementing a quantum switch and a quantum memory for matter wave lattice solitons by making them interact with "effective" potentials (barrier/well) corresponding to...
Efficiency in Quantum Key Distribution Protocols with Entangled Gaussian States (2006)
Rodó, C., Romero-Isart, O., Eckert, K., Sanpera, A.
Quantum key distribution (QKD) refers to specific quantum strategies which permit the secure distribution of a secret key between two parties that wish to communicate secretly. Quantum cryptography...
Predicting spinor condensate dynamics from simple principles (2006)
Moreno-Cardoner, M., Mur-Petit, J., Guilleumas, M., Polls, A., Sanpera, A., Lewenstein, M.
We study the spin dynamics of quasi-one-dimensional F=1 condensates both at zero and finite temperatures for arbitrary initial spin configurations. The rich dynamical evolution exhibited by these...
Quantum State Transfer in Spin-1 Chains (2006)
Romero-Isart, O., Eckert, K., Sanpera, A.
We study the transfer of quantum information through a Heisenberg spin-1 chain prepared in its ground state. We measure the efficiency of such a quantum channel {\em via} the fidelity of retrieving...
Travelling to exotic places with ultracold atoms (2006)
Lewenstein, M., Kubasiak, A., Larson, J., Menotti, C., Morigi, G., Osterloh, K., ...
We review and speculate on two recent developments of quantum optics and ultracold atoms. First, we discuss a possible realization of "phonon" physics, or as we call it "refracton" physics with...
Quantum polarization spectroscopy of ultracold spinor gases (2006)
Eckert, K., Zawitkowski, L., Sanpera, A., Lewenstein, M., Polzik, E. S.
We propose a method for the detection of ground state quantum phases of spinor gases through a series of two quantum nondemolition measurements performed by sending off-resonant, polarized light...
Ultracold atomic Bose and Fermi spinor gases in optical lattices (2006)
Eckert, K., Zawitkowski, L., Leskinen, M. J., Sanpera, A., Lewenstein, M.
We investigate magnetic properties of Mott-insulating phases of ultracold Bose and Fermi spinor gases in optical lattices. We consider in particular the F=2 Bose gas, and the F=3/2 and F=5/2 Fermi...
Disordered ultracold atomic gases in optical lattices: A case study of Fermi-Bose mixtures (2006)
Ahufinger, V., Sanchez-Palencia, L., Kantian, A., Sanpera, A., Lewenstein, M.
We present a review of properties of ultracold atomic Fermi-Bose mixtures in inhomogeneous and random optical lattices. In the strong interacting limit and at very low temperatures, fermions form,...
Strongly correlated Fermi-Bose mixtures in disordered optical lattices (2006)
Sanchez-Palencia, L., Ahufinger, V., Kantian, A., Zakrzewski, Jakub, Sanpera, A., Lewenstein, M.
We investigate theoretically the low-temperature physics of a two-component ultracold mixture of bosons and fermions in disordered optical lattices. We focus on the strongly correlated regime. We...
Strongly correlated Fermi-Bose mixtures in disordered optical lattices (2006)
Sanchez-Palencia, L., Ahufinger, V., Kantian, A., Zakrzewski, Jakub, Sanpera, A., Lewenstein, M.
We investigate theoretically the low-temperature physics of a two-component ultracold mixture of bosons and fermions in disordered optical lattices. We focus on the strongly correlated regime. We...
Strongly correlated Fermi-Bose mixtures in disordered optical lattices (2006)
Sanchez-Palencia, L., Ahufinger, V., Kantian, A., Zakrzewski, Jakub, Sanpera, A., Lewenstein, M.
We investigate theoretically the low-temperature physics of a two-component ultracold mixture of bosons and fermions in disordered optical lattices. We focus on the strongly correlated regime. We...
Trapped ion chain as a neural network (2005)
Pons, M., Ahufinger, V., Wunderlich, C., Sanpera, A., Lewenstein, M.
We demonstrate the possibility of realizing a neural network in a chain of trapped ions with induced long range interactions. Such models permit to store information distributed over the whole...
Strongly correlated Fermi-Bose mixtures in disordered optical lattices (2005)
Sanchez-Palencia, L., Ahufinger, V., Kantian, A., Zakrzewski, Jakub, Sanpera, A., Lewenstein, M.
We investigate theoretically the low-temperature physics of a two-component ultracold mixture of bosons and fermions in disordered optical lattices. We focus on the strongly correlated regime. We...
Strongly correlated Fermi-Bose mixtures in disordered optical lattices (2005)
Sanchez-Palencia, L., Ahufinger, V., Kantian, A., Zakrzewski, Jakub, Sanpera, A., Lewenstein, M.
We investigate theoretically the low-temperature physics of a two-component ultracold mixture of bosons and fermions in disordered optical lattices. We focus on the strongly correlated regime. We...
Splitting and merging an elongated Bose-Einstein condensate at finite temperature (2005)
Mebrahtu, A., Sanpera, A., Lewenstein, M.
We analyze coherence effects during the splitting of a quasi one-dimensional condensate into two spatially separated ones and their subsequent merging into a single condensate. Our analysis takes...
Disordered ultracold atomic gases in optical lattices: A case study of Fermi-Bose mixtures (2005)
Ahufinger, V., Sanchez-Palencia, L., Kantian, A., Sanpera, A., Lewenstein, M.
We present a review of properties of ultracold atomic Fermi-Bose mixtures in inhomogeneous and random optical lattices. In the strong interacting limit and at very low temperatures, fermions form,...
Quantum Key Distillation from Gaussian States by Gaussian Operations (2005)
Navascués,M., Bae,J., Cirac,J. Ignacio, Lewestein,M., Sanpera,A., Acín,A.
Disordered ultracold atomic gases in optical lattices: A case study of Fermi-Bose mixtures (2005)
Ahufinger, V., Sanchez-Palencia, L., Kantian, A., Sanpera, A., Lewenstein, M.
We present a review of properties of ultracold atomic Fermi-Bose mixtures in inhomogeneous and random optical lattices. In the strong interacting limit and at very low temperatures, fermions form,...
Disordered ultracold atomic gases in optical lattices: A case study of Fermi-Bose mixtures (2005)
Ahufinger, V., Sanchez-Palencia, L., Kantian, A., Sanpera, A., Lewenstein, M.
We present a review of properties of ultracold atomic Fermi-Bose mixtures in inhomogeneous and random optical lattices. In the strong interacting limit and at very low temperatures, fermions form,...
Quantum Key Distillation from Gaussian States by Gaussian Operations (2005)
Navascués, M., Bae, J., Cirac, J. Ignacio, Lewestein, M., Sanpera, A., Acín, A.
Lattice solitons in quasicondensates (2004)
We analyze finite temperature effects in the generation of bright solitons in condensates in optical lattices. We show that even in the presence of strong phase fluctuations solitonic structures with...
Liu, X., Sanpera, A., Lewenstein, M.
We address nonsequential double ionization induced by strong, linearly polarized laser fields of only a few cycles, considering a physical mechanism in which the second electron is dislodged by the...
Key distillation from Gaussian states by Gaussian operations (2004)
Navascues, M., Bae, J., Cirac, J. I., Lewenstein, M., Sanpera, A., Acin, A.
We study the secrecy properties of Gaussian states under Gaussian operations. Although such operations are useless for quantum distillation, we prove that it is possible to distill a secret key...
Four photon polarization entanglement tests and applications (2004)
Bourennane,Mohamed, Eibl,Manfred, Gaertner,Sascha, Kurtsiefer,Christian, Weinfurter,Harald, Cabello,A., ...
Four photon polarization entanglement tests and applications (2004)
Bourennane, Mohamed, Eibl, Manfred, Gaertner, Sascha, Kurtsiefer, Christian, Weinfurter, Harald, Cabello, A., ...
Ahufinger, V., Sanpera, A., Pedri, P., Santos, L., Lewenstein, M.
We analyze the generation and mobility of discrete solitons in Bose-Einstein condensates confined in an optical lattice under realistic experimental conditions. We discuss first the creation of 1D...
Coherence Properties of Guided-Atom Interferometers (2003)
Kreutzmann, H., Poulsen, U. V., Lewenstein, M., Dumke, R., Ertmer, W., Birkl, G., ...
We present a detailed investigation of the coherence properties of beam splitters and Mach-Zehnder interferometers for guided atoms. It is demonstrated that such a setup permits coherent wave packet...
Atom optics with rotating Bose-Einstein condensates (2002)
Josopait, I., Dobrek, L., Santos, L., Sanpera, A., Lewenstein, M.
The atom optics of Bose-Einstein condensates containing a vortex of circulation one is discussed. We first analyze in detail the reflection of such a condensate falling on an atomic mirror. In a...
Experimental detection of entanglement via witness operators and local measurements (2002)
Guehne, O., Hyllus, P., Bruss, D., Ekert, A., Lewenstein, M., Macchiavello, C., ...
In this paper we address the problem of detection of entanglement using only few local measurements when some knowledge about the state is given. The idea is based on an optimized decomposition of...
Characterization and control of phase fluctuations in elongated Bose-Einstein condensates (2002)
Kreutzmann, H., Sanpera, A., Santos, L., Lewenstein, M., Hellweg, D., Cacciapuoti, L., ...
Quasi one dimensional Bose-Einstein condensates (BECs) in elongated traps exhibit significant phase fluctuations even at very low temperatures. We present recent experimental results on the dynamic...
Entanglement properties of composite quantum systems (2002)
Eckert, K., Gühne, O., Hulpke, F., Hyllus, P., Korbicz, J., Mompart, J., ...
We present here an overview of our work concerning entanglement properties of composite quantum systems. The characterization of entanglement, i.e. the possibility to assert if a given quantum state...
Detection of entanglement with few local measurements (2002)
Guehne, O., Hyllus, P., Bruss, D., Ekert, A., Lewenstein, M., Macchiavello, C., ...
We introduce a general method for the experimental detection of entanglement by performing only few local measurements, assuming some prior knowledge of the density matrix. The idea is based on the...
Vortex-vortex interactions in toroidally trapped Bose-Einstein condensates (2002)
Schulte, T., Santos, L., Sanpera, A., Lewenstein, M.
We analyze the vortex dynamics and vortex-vortex interactions in Bose-Einstein condensates confined in toroidal traps. We show that this particular geometry strongly distorts the vortex dynamics. The...
Generation and interaction of solitons in Bose-Einstein condensates (2002)
Burger, S., Carr, L. D., Ohberg, P., Sengstock, K., Sanpera, A.
Generation, interaction and detection of dark solitons in Bose-Einstein condensates is considered. In particular, we focus on the dynamics resulting from phase imprinting and density engineering. The...
Reflections upon separability and distillability (2001)
Bruss, D., Cirac, J. I., Horodecki, P., Hulpke, F., Kraus, B., Lewenstein, M., ...
We present an abstract formulation of the so-called Innsbruck-Hannover programme that investigates quantum correlations and entanglement in terms of convex sets. We present a unified description of...
Classification of mixed three-qubit states (2001)
Acin, A., Bruss, D., Lewenstein, M., Sanpera, A.
We introduce a classification of mixed three-qubit states, in which we define the classes of separable, biseparable, W- and GHZ-states. These classes are successively embedded into each other. We...
Dark soliton creation in Bose-Einstein condensates (2000)
Carr, L. D., Brand, J., Burger, S., Sanpera, A.
It is demonstrated that stable, standing dark solitons can be created in current dilute-gas Bose-Einstein condensate experiments by the proper combination of phase and density engineering. Other...
Separability and distillability in composite quantum systems -a primer- (2000)
Lewenstein, M., Bruss, D., Cirac, J. I., Kraus, B., Kus, M., Samsonowicz, J., ...
Quantum mechanics is already 100 years old, but remains alive and full of challenging open problems. On one hand, the problems encountered at the frontiers of modern theoretical physics like Quantum...
Four-wave mixing in degenerate atomic gases (2000)
Villain, P., Ohberg, P., Santos, L., Sanpera, A., Lewenstein, M.
We study the process of four-wave mixing (4WM) in ultracold degenerate atomic gases. In particular we address the problem of 4WM in boson-fermion mixtures. We develop an approximate description of...
Generation and evolution of vortex-antivortex pairs in Bose-Einstein condensates (2000)
Santos, L., Schulte, T., Sanpera, A.
We propose a method for generating and controlling a spatially separated vortex--antivortex pair in a Bose-Einstein condensate trapped in a toroidal potential. Our simulations of the time dependent...
Coherent Evolution of Bouncing Bose-Einstein Condensates (1999)
Bongs, K., Burger, S., Birkl, G., Sengstock, K., Ertmer, W., Rzazewski, K., ...
We investigate the evolution of Bose-Einstein condensates falling under gravity and bouncing off a mirror formed by a far-detuned sheet of light. After reflection, the atomic density profile develops...
Dark Solitons in Bose-Einstein Condensates (1999)
Burger, S., Bongs, K., Dettmer, S., Ertmer, W., Sengstock, K., Sanpera, A., ...
Dark solitons in cigar shaped Bose-Einstein condensates of Rubidium-87 are created by a phase imprinting method. Coherent and dissipative dynamics of the solitons has been observed.
Wave packet dynamics with Bose-Einstein condensates (1997)
Dum, R., Sanpera, A., Brewczyk, M., Kus, M., Rzcazewski, K., ...
We study wave packet dynamics of a Bose condensate in a periodically shaken trap. Dichotomy, that is, dynamic splitting of the condensate, and dynamic stabilization are analyzed in analogy with...
Quantum privacy amplification and the security of quantum cryptography over noisy channels (1996)
Deutsch, D., Ekert, A., Jozsa, R., Macchiavello, C., Popescu, S., Sanpera, A.
Existing quantum cryptographic schemes are not, as they stand, operable in the presence of noise on the quantum communication channel. Although they become operable if they are supplemented by...