Verstraete, F.; Cirac, J. I.: Valence-bond states for quantum computation. Physical Review A 70 (6), 060302 (2004)

Verstraete, F.; Porras, D.; Cirac, J. I.: Density matrix renormalization group and periodic boundary conditions: A quantum information perspective. Physical Review Letters 93 (22), 227205 (2004)

Vollbrecht, K. G. H.; Solano, E.; Cirac, J. I.: Ensemble quantum computation with atoms in periodic potentials. Physical Review Letters 93 (22), 220502 (2004)

Julsgaard, B.; Sherson, J.; Cirac, J. I.; Fiurasek, J.; Polzik, E. S.: Experimental demonstration of quantum memory for light. Nature 432 (7016), pp. 482 - 486 (2004)

Verstraete, F.; Garcia-Ripoll, J. J.; Cirac, J. I.: Matrix product density operators: Simulation of finite-temperature and dissipative systems. Physical Review Letters 93 (20), 207204 (2004)

Popp, M.; Paredes, B.; Cirac, J. I.: Adiabatic path to fractional quantum Hall states of a few bosonic atoms. Physical Review A 70 (5), 053612 (2004)

Hammerer, K.; Mølmer, K.; Polzik, E. S.; Cirac, J. I.: Light-matter quantum interface. Physical Review A 70 (4), 044304 (2004)

Paredes, B.; Garcia-Ripoll, J. J.; Zoller, P.; Cirac, J. I.: Strong correlation effects and quantum information theory of low dimensional atomic gases. Journal de Physique IV 116, pp. 135 - 168 (2004)

Schuch, N.; Verstraete, F.; Cirac, J. I.: Quantum entanglement theory in the presence of superselection rules. Physical Review A 70 (4), 042310 (2004)

Dreher, M.; Takahashi, E.; Meyer-ter-Vehn, J.; Witte, K. J.: Observation of superradiant amplification of ultrashort laser pulses in a plasma. Physical Review Letters 93 (9), 095001 (2004)

Santos, L.; Baranov, M. A.; Cirac, J. I.; Everts, H. U.; Fehrmann, H.; Lewenstein, M.: Atomic quantum gases in Kagomé lattices. Physical Review Letters 93 (3), 030601 (2004)

Dür, W.; Cirac, J. I.; Horodecki, P.: Nonadditivity of quantum capacity for multiparty communication channels. Physical Review Letters 93 (2), 020503 (2004)

Moreno, E.; Garcia-Vidal, F. J.; Erni, D.; Cirac, J. I.; Martin-Moreno, L.: Theory of Plasmon-Assisted Transmission of Entangled Photons. Physical Review Letters 92 (23), 236801 (2004)

Vollbrecht, K. G. H.; Werner, R. F.; Wolf, M. M.: Irreversibility of entanglement distillation for a class of symmetric states. Physical Review A 69 (6), 062304 (2004)

Porras, D.; Cirac, J. I.: Effective quantum spin systems with trapped ions. Physical Review Letters 92 (20), 207901 (2004)

Paredes, B.; Widera, A.; Murg, V.; Mandel, O.; Fölling, S.; Cirac, J. I.; Shlyapnikov, G. V.; Hänsch, T. W.; Bloch, I.: Tonks-Girardeau gas of ultracold atoms in an optical lattice. Nature 429 (6989), pp. 277 - 281 (2004)

Tóth, G.: Entanglement detection in optical lattices of bosonic atoms with collective measurements. Physical Review A 69 (5), 052327 (2004)

Wolf, M. M.; Giedke, G.; Krüger, O.; Werner, R. F.; Cirac, J. I.: Gaussian entanglement of formation. Physical Review A 69 (5), 052320 (2004)

Jungreuthmayer, C.; Geissler, M.; Zanghellini, J.; Brabec, T.: Microscopic analysis of large-cluster explosion in intense laser fields. Physical Review Letters 92 (13), 133401 (2004)

Murg, V.; Cirac, J. I.: Adiabatic time evolution in spin systems. Physical Review A 69 (4), 042320 (2004)