TY - JOUR
T1 - Entanglement and Coherence in Quantum State Merging
JF - Physical Review Letters
Y1 - 2016
A1 - Streltsov, A.
A1 - Chitambar, E.
A1 - Rana, S.
A1 - Bera, N.
A1 - Winter, A.
A1 - Lewenstein, M.
VL - 116
UR - http://link.aps.org/doi/10.1103/PhysRevLett.116.240405http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevLett.116.240405/fulltexthttp://link.aps.org/accepted/10.1103/PhysRevLett.116.240405http://link.aps.org/article/10.1103/PhysRevLett.116.240405
JO - Phys. Rev. Lett.
ER -
TY - JOUR
T1 - Entanglement Spectrum, Critical Exponents, and Order Parameters in Quantum Spin Chains
JF - Physical Review Letters
Y1 - 2012
A1 - De Chiara, G.
A1 - Lepori, L.
A1 - Lewenstein, M.
A1 - Sanpera, A.
AB - We investigate the entanglement spectrum near criticality in finite quantum spin chains. Using finite size scaling we show that when approaching a quantum phase transition, the Schmidt gap, i.e., the difference between the two largest eigenvalues of the reduced density matrix λ1, λ2, signals the critical point and scales with universal critical exponents related to the relevant operators of the corresponding perturbed conformal field theory describing the critical point. Such scaling behavior allows us to identify explicitly the Schmidt gap as a local order parameter.
VL - 109
IS - 23
JO - Phys. Rev. Lett.
ER -
TY - JOUR
T1 - Quantum Memory Assisted Probing of Dynamical Spin Correlations
JF - Physical Review Letters
Y1 - 2012
A1 - O. Romero-Isart
A1 - Rizzi, M.
A1 - Muschik, C. A.
A1 - Polzik, E. S.
A1 - Lewenstein, M.
A1 - Sanpera, A.
AB - We propose a method to probe time-dependent correlations of nontrivial observables in many-body ultracold lattice gases. The scheme uses a quantum nondemolition matter-light interface, first to map the observable of interest on the many-body system into the light and then to store coherently such information into an external system acting as a quantum memory. Correlations of the observable at two (or more) instances of time are retrieved with a single final measurement that includes the readout of the quantum memory. Such a method brings to reach the study of dynamics of many-body systems in and out of equilibrium by means of quantum memories in the field of quantum simulators.
VL - 108
IS - 6
JO - Phys. Rev. Lett.
ER -
TY - JOUR
T1 - Bilinear-biquadratic spin-1 chain undergoing quadratic Zeeman effect
JF - Physical Review B
Y1 - 2011
A1 - De Chiara, G.
A1 - Lewenstein, M.
A1 - Sanpera, A.
AB - The Heisenberg model for spin-1 bosons in one dimension presents many different quantum phases, including the famous topological Haldane phase. Here we study the robustness of such phases in front of a SU(2) symmetry-breaking field as well as the emergence of unique phases. Previous studies have analyzed the effect of such uniaxial anisotropy in some restricted relevant points of the phase diagram. Here we extend those studies and present the complete phase diagram of the spin-1 chain with uniaxial anisotropy. To this aim, we employ the density-matrix renormalization group together with analytical approaches. The complete phase diagram can be realized using ultracold spinor gases in the Mott insulator regime under a quadratic Zeeman effect.
VL - 84
UR - http://prb.aps.org/abstract/PRB/v84/i5/e054451
IS - 5
JO - Phys. Rev. B
ER -
TY - JOUR
T1 - Creating p-wave superfluids and topological excitations in optical lattices
JF - Phys. Rev. A
Y1 - 2010
A1 - Massignan, P.
A1 - Sanpera, A.
A1 - Lewenstein, M.
AB - We propose to realize a p-wave superfluid using bosons mixed with a single species of fermions in a deep optical lattice. We analyze with a self-consistent method its excitation spectrum in presence of a vortex, and we point out the range of interaction strengths in which the zero-energy mode with topological character exists on a finite optical lattice. Lattice effects are strongest close to fermionic half filling: here the linearity of the low-lying spectrum is lost, and a new class of extended zero-energy modes with checkerboard structure and d-wave symmetry appears.
PB - American Physical Society
VL - 81
UR - http://link.aps.org/doi/10.1103/PhysRevA.81.031607
ER -
TY - JOUR
T1 - Topological superfluids on a lattice with non-Abelian gauge fields
JF - Europhysics Letters
Y1 - 2010
A1 - A. Kubasiak
A1 - Massignan, P.
A1 - Lewenstein, M.
VL - 92
UR - http://arxiv.org/abs/1007.4827
ER -
TY - JOUR
T1 - Atomic Fermi-Bose Mixtures in Inhomogeneous and Random Lattices: From Fermi Glass to Quantum Spin Glass and Quantum Percolation
JF - Physical Review Letters
Y1 - 2004
A1 - Sanpera, A.
A1 - Kantian, A.
A1 - Sanchez-Palencia, L.
A1 - Zakrzewski, J.
A1 - Lewenstein, M.
VL - 93
UR - http://prl.aps.org/abstract/PRL/v93/i4/e040401
ER -
TY - JOUR
T1 - Coherence Properties of Guided-Atom Interferometers
JF - Physical Review Letters
Y1 - 2004
A1 - Kreutzmann, H.
A1 - Poulsen, U.
A1 - Lewenstein, M.
A1 - Dumke, R.
A1 - Ertmer, W.
A1 - Birkl, G.
A1 - Sanpera, A.
VL - 92
UR - http://prl.aps.org/abstract/PRL/v92/i16/e163201
ER -
TY - JOUR
T1 - Detection of entanglement with few local measurements
JF - Physical Review A
Y1 - 2002
A1 - Gühne, O.
A1 - Hyllus, P.
A1 - Bruß, D.
A1 - Ekert, A.
A1 - Lewenstein, M.
A1 - Macchiavello, C.
A1 - Sanpera, A.
VL - 66
UR - http://pra.aps.org/abstract/PRA/v66/i6/e062305
ER -
TY - JOUR
T1 - Classification of Mixed Three-Qubit States
JF - Physical Review Letters
Y1 - 2001
A1 - Acín, A.
A1 - Bruß, D.
A1 - Lewenstein, M.
A1 - Sanpera, A.
VL - 87
UR - http://prl.aps.org/abstract/PRL/v87/i4/e040401
ER -
TY - JOUR
T1 - Feynman's path-integral approach for intense-laser-atom interactions
JF - Science (New York, N.Y.)
Y1 - 2001
A1 - Salieres, P.
A1 - Carre, B.
A1 - Le Deroff, L.
A1 - Grasbon, F.
A1 - Paulus, G. G.
A1 - Walther, H.
A1 - Kopold, R.
A1 - Becker, W.
A1 - Milosevic, D. B.
A1 - Sanpera, A.
A1 - Lewenstein, M.
AB - Atoms interacting with intense laser fields can emit electrons and photons of very high energies. An intuitive and quantitative explanation of these highly nonlinear processes can be found in terms of a generalization of classical Newtonian particle trajectories, the so-called quantum orbits. Very few quantum orbits are necessary to reproduce the experimental results. These orbits are clearly identified, thus opening the way for an efficient control as well as previously unknown applications of these processes.
VL - 292
UR - http://www.sciencemag.org/cgi/content/abstract/292/5518/902
ER -