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P-representation techniques, which have been very successful in quantum optics and in other fields, are also useful for general bosonic quantum-dynamical many-body calculations such as Bose-Einstein condensation. We introduce a representation called the gauge P representation, which greatly widens the range of tractable problems. Our treatment results in an… (More)

Entanglement plays central role in quantum information theory [1]. Pure state entanglement of bipartite systems is well understood in the sense that the relevant parameters for its optimal manipulation by local operations and classical communication (LOCC) have been identified and analyzed [2], [3]. Many efforts have also been devoted to the study of… (More)

- J-C Jaskula, Marie Bonneau, +6 authors Christoph I . Westbrook
- Physical review letters
- 2010

We demonstrate sub-Poissonian number differences in four-wave mixing of Bose-Einstein condensates of metastable helium. The collision between two Bose-Einstein condensates produces a scattering halo populated by pairs of atoms of opposing velocities, which we divide into several symmetric zones. We show that the atom number difference for opposing zones has… (More)

- K. V. Kheruntsyan, J-C Jaskula, +6 authors Christoph I . Westbrook
- Physical review letters
- 2012

The Cauchy-Schwarz (CS) inequality-one of the most widely used and important inequalities in mathematics-can be formulated as an upper bound to the strength of correlations between classically fluctuating quantities. Quantum-mechanical correlations can, however, exceed classical bounds. Here we realize four-wave mixing of atomic matter waves using colliding… (More)

- Peter D. Drummond, P. Deuar, K. V. Kheruntsyan
- Physical review letters
- 2004

A technique to simulate the grand canonical ensembles of interacting Bose gases is presented. Results are generated for many temperatures by averaging over energy-weighted stochastic paths, each corresponding to a solution of coupled Gross-Pitaevskii equations with phase noise. The stochastic gauge method used relies on an off-diagonal coherent-state… (More)

- P. Deuar, Koji Nemoto
- 2000

A lower bound on the amount of noise that must be added to a GHZ-like entangled state to make it separable (also called the random robustness) is found using the transposition condition. The bound is applicable to arbitrary numbers of subsystems, and dimensions of Hilbert space, and is shown to be exact for qubits. The new bound is compared with previous… (More)

- Mark R. Dowling, Peter D. Drummond, Matthew J. Davis, P. Deuar
- Physical review letters
- 2005

The calculation of quantum dynamics is currently a central issue in theoretical physics, with diverse applications ranging from ultracold atomic Bose-Einstein condensates to condensed matter, biology, and even astrophysics. Here we demonstrate a conceptually simple method of determining the regime of validity of stochastic simulations of unitary quantum… (More)

- Emilia Witkowska, P. Deuar, Mieczyslaw R. Gajda, Kazimierz Rzazewski
- Physical review letters
- 2011

We calculate the evaporative cooling dynamics of trapped one-dimensional Bose-Einstein condensates for parameters leading to a range of condensates and quasicondensates in the final equilibrium state, using the classical fields method. We confirm that solitons are created during the evaporation process by the Kibble-Zurek mechanism, but subsequently… (More)

- Sebastian Wüster, Jovica Stanojevic, +4 authors Jan Michael Rost
- 2010

S. Wüster,1,* J. Stanojevic,1 C. Ates,1 T. Pohl,1 P. Deuar,2 J. F. Corney,3 and J. M. Rost1 1Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Strasse 38, D-01187 Dresden, Germany 2Institute of Physics, Polish Academy of Sciences, Aleja Lotników 32/46, PL-02-668 Warsaw, Poland 3ARC Centre of Excellence for Quantum-Atom Optics, School of… (More)

- Valentina Krachmalnicoff, J-C Jaskula, +8 authors K. V. Kheruntsyan
- Physical review letters
- 2010

We investigate the atom-optical analog of degenerate four-wave mixing by colliding two Bose-Einstein condensates of metastable helium. The momentum distribution of the scattered atoms is measured in three dimensions. A simple analogy with photon phase matching conditions suggests a spherical final distribution. We find, however, that it is an ellipsoid with… (More)