All Outputs (25)

Progress towards quantum-enhanced interferometry with harmonically trapped quantum matter-wave bright solitons (2016)
Journal Article
Gertjerenken, B., Wiles, T., & Weiss, C. (2016). Progress towards quantum-enhanced interferometry with harmonically trapped quantum matter-wave bright solitons. Physical Review A, 94(5), Article 053638. https://doi.org/10.1103/physreva.94.053638

We model the dynamics of attractively interacting ultracold bosonic atoms in a quasi-one-dimensional wave guide with additional harmonic trapping. Initially, we prepare the system in its ground state and then shift the zero of the harmonic trap and s... Read More about Progress towards quantum-enhanced interferometry with harmonically trapped quantum matter-wave bright solitons.

Grand-canonical condensate fluctuations in weakly interacting Bose-Einstein condensates of light (2016)
Journal Article
Weiss, C., & Tempere, J. (2016). Grand-canonical condensate fluctuations in weakly interacting Bose-Einstein condensates of light. Physical Review E, 94(4), Article 042124. https://doi.org/10.1103/physreve.94.042124

Grand-canonical fluctuations of Bose-Einstein condensates of light are accessible to state-of-the-art experiments [J. Schmitt et al., Phys. Rev. Lett. 112, 030401 (2014).]. We phenomenologically describe these fluctuations by using the grand-canonica... Read More about Grand-canonical condensate fluctuations in weakly interacting Bose-Einstein condensates of light.

Center-of-mass motion as a sensitive convergence test for variational multimode quantum dynamics (2016)
Journal Article
Cosme, J., Weiss, C., & Brand, J. (2016). Center-of-mass motion as a sensitive convergence test for variational multimode quantum dynamics. Physical Review A, 94(4), Article 043603. https://doi.org/10.1103/physreva.94.043603

Multimode expansions in computational quantum dynamics promise convergence toward exact results upon increasing the number of modes. Convergence is difficult to ascertain in practice due to the unfavorable scaling of required resources for many-parti... Read More about Center-of-mass motion as a sensitive convergence test for variational multimode quantum dynamics.

Quantum reflection of bright solitary matter waves from a narrow attractive potential (2016)
Journal Article
Marchant, A., Billam, T., Yu, M., Rakonjac, A., Helm, J., Polo, J., Weiss, C., Gardiner, S., & Cornish, S. (2016). Quantum reflection of bright solitary matter waves from a narrow attractive potential. Physical Review A, 93(2), Article 021604(R). https://doi.org/10.1103/physreva.93.021604

We report the observation of quantum reflection from a narrow attractive potential using bright solitary matter waves formed from a Rb 85 Bose-Einstein condensate. We create the attractive potential using a tightly focused, red-detuned laser beam, an... Read More about Quantum reflection of bright solitary matter waves from a narrow attractive potential.

Superballistic center-of-mass motion in one-dimensional attractive Bose gases: Decoherence-induced Gaussian random walks in velocity space (2016)
Journal Article
Weiss, C., Cornish, S., Gardiner, S., & Breuer, H.-P. (2016). Superballistic center-of-mass motion in one-dimensional attractive Bose gases: Decoherence-induced Gaussian random walks in velocity space. Physical Review A, 93(1), Article 103605. https://doi.org/10.1103/physreva.93.013605

We show that the spreading of the center-of-mass density of ultracold attractively interacting bosons can become superballistic in the presence of decoherence, via one-, two-, and/or three-body losses. In the limit of weak decoherence, we analyticall... Read More about Superballistic center-of-mass motion in one-dimensional attractive Bose gases: Decoherence-induced Gaussian random walks in velocity space.

From short-time diffusive to long-time ballistic dynamics: The unusual center-of-mass motion of quantum bright solitons (2015)
Journal Article
Weiss, C., Gardiner, S., & Breuer, H. (2015). From short-time diffusive to long-time ballistic dynamics: The unusual center-of-mass motion of quantum bright solitons. Physical Review A, 91(6), Article 063616. https://doi.org/10.1103/physreva.91.063616

Brownian motion is ballistic on short time scales and diffusive on long time scales. Our theoretical investigations indicate that one can observe the exact opposite—an “anomalous diffusion process” where initially diffusive motion becomes ballistic o... Read More about From short-time diffusive to long-time ballistic dynamics: The unusual center-of-mass motion of quantum bright solitons.

Entangling two distinguishable quantum bright solitons via collisions (2014)
Presentation / Conference Contribution
Billam, T. P., Blackley, C. L., Gertjerenken, B., Cornish, S. L., & Weiss, C. (2014, April). Entangling two distinguishable quantum bright solitons via collisions. Presented at 22nd International Laser Physics Workshop (LPHYS'13), Prague, Czech Republic

The generation of mesoscopic Bell states via collisions of distinguishable bright solitons has been suggested in Phys. Rev. Lett. 111, 100406 (2013). Here, we extend our former proposal to two hyperfine states of 85Rb instead of two different atomic... Read More about Entangling two distinguishable quantum bright solitons via collisions.

Splitting bright matter-wave solitons on narrow potential barriers: Quantum to classical transition and applications to interferometry (2014)
Journal Article
Helm, J., Rooney, S., Weiss, C., & Gardiner, S. (2014). Splitting bright matter-wave solitons on narrow potential barriers: Quantum to classical transition and applications to interferometry. Physical Review A, 89(3), Article 033610. https://doi.org/10.1103/physreva.89.033610

We study bright solitons in the Gross-Pitaevskii equation as they are split and recombined in a low-energy system. We present analytic results determining the general region in which a soliton may not be split on a potential barrier and confirm these... Read More about Splitting bright matter-wave solitons on narrow potential barriers: Quantum to classical transition and applications to interferometry.

Phase-matching condition for enhanced entanglement of colliding indistinguishable quantum bright solitons in a harmonic trap (2014)
Journal Article
Holdaway, D., Weiss, C., & Gardiner, S. (2014). Phase-matching condition for enhanced entanglement of colliding indistinguishable quantum bright solitons in a harmonic trap. Physical Review A, 89(1), Article 013611. https://doi.org/10.1103/physreva.89.013611

We investigate finite number effects in collisions between two states of an initially well defined number of identical bosons with attractive contact interactions, oscillating in the presence of harmonic confinement in one dimension. We investigate t... Read More about Phase-matching condition for enhanced entanglement of colliding indistinguishable quantum bright solitons in a harmonic trap.

Generating Mesoscopic Bell States via Collisions of Distinguishable Quantum Bright Solitons (2013)
Journal Article
Gertjerenken, B., Billam, T., Blackley, C., Le Sueur, C., Khaykovich, L., Cornish, S., & Weiss, C. (2013). Generating Mesoscopic Bell States via Collisions of Distinguishable Quantum Bright Solitons. Physical Review Letters, 111(10), Article 100406. https://doi.org/10.1103/physrevlett.111.100406

We investigate numerically the collisions of two distinguishable quantum matter-wave bright solitons in a one-dimensional harmonic trap. We show that such collisions can be used to generate mesoscopic Bell states that can reliably be distinguished fr... Read More about Generating Mesoscopic Bell States via Collisions of Distinguishable Quantum Bright Solitons.

Beyond-mean-field behavior of large Bose-Einstein condensates in double-well potentials (2013)
Journal Article
Gertjerenken, B., & Weiss, C. (2013). Beyond-mean-field behavior of large Bose-Einstein condensates in double-well potentials. Physical Review A, 88(3), Article 033608. https://doi.org/10.1103/physreva.88.033608

For the dynamics of Bose-Einstein condensates (BECs), differences between mean-field (Gross-Pitaevskii) physics and N-particle quantum physics often disappear if the BEC becomes larger and larger. In particular, the time scale for which both dynamics... Read More about Beyond-mean-field behavior of large Bose-Einstein condensates in double-well potentials.

Collision dynamics and entanglement generation of two initially independent and indistinguishable boson pairs in one-dimensional harmonic confinement (2013)
Journal Article
Holdaway, D., Weiss, C., & Gardiner, S. (2013). Collision dynamics and entanglement generation of two initially independent and indistinguishable boson pairs in one-dimensional harmonic confinement. Physical Review A, 87(4), Article 043632. https://doi.org/10.1103/physreva.87.043632

We investigate finite-number effects in collisions between two states of an initially well-known number of identical bosons with contact interactions, oscillating in the presence of harmonic confinement in one dimension. We investigate two N/2 (inter... Read More about Collision dynamics and entanglement generation of two initially independent and indistinguishable boson pairs in one-dimensional harmonic confinement.

Effective time-reversal via periodic shaking (2013)
Presentation / Conference Contribution
Weiss, C. (2013, December). Effective time-reversal via periodic shaking. Presented at 21st International Laser Physics Workshop (LPHYS'12), Calgary, Canada

For a periodically shaken optical lattice, effective time-reversal is investigated numerically. For interacting ultra-cold atoms, the scheme of [J. Phys. B 45, 021002 (2012)] involves a quasi-instantaneous change of both the shaking-amplitude and the... Read More about Effective time-reversal via periodic shaking.

Elastic scattering of a quantum matter-wave bright soliton on a barrier (2012)
Journal Article
Weiss, C., & Castin, Y. (2012). Elastic scattering of a quantum matter-wave bright soliton on a barrier. Journal of Physics A: Mathematical and Theoretical, 45(45), Article 455306. https://doi.org/10.1088/1751-8113/45/45/455306

We consider a one-dimensional matter-wave bright soliton, corresponding to the ground bound state of N bosonic particles of mass m having a binary attractive delta potential interaction on the open line. For a full N-body quantum treatment, we derive... Read More about Elastic scattering of a quantum matter-wave bright soliton on a barrier.

Scattering bright solitons: Quantum versus mean-field behavior (2012)
Journal Article
Gertjerenken, B., Billam, T. P., Khaykovich, L., & Weiss, C. (2012). Scattering bright solitons: Quantum versus mean-field behavior. Physical Review A, 86(3), Article 033608. https://doi.org/10.1103/physreva.86.033608

We investigate scattering bright solitons off a potential using both analytical and numerical methods. Our paper focuses on low kinetic energies for which differences between the mean-field description via the Gross-Pitaevskii equation (GPE) and the... Read More about Scattering bright solitons: Quantum versus mean-field behavior.

Nonlocal quantum superpositions of bright matter-wave solitons and dimers (2012)
Journal Article
Gertjerenken, B., & Weiss, C. (2012). Nonlocal quantum superpositions of bright matter-wave solitons and dimers. Journal of Physics B: Atomic, Molecular and Optical Physics, 45(16), https://doi.org/10.1088/0953-4075/45/16/165301

The scattering of bright quantum solitons at barrier potentials in one-dimensional geometries is investigated. Such protocols have been predicted to lead to the creation of nonlocal quantum superpositions. The centre-of-mass motion of these bright ma... Read More about Nonlocal quantum superpositions of bright matter-wave solitons and dimers.

Quantum theory of bright matter-wave solitons in harmonic confinement (2012)
Journal Article
Holdaway, D., Weiss, C., & Gardiner, S. (2012). Quantum theory of bright matter-wave solitons in harmonic confinement. Physical Review A, 85(5), Article 053618. https://doi.org/10.1103/physreva.85.053618

This paper investigates bright quantum-matter-wave solitons beyond the Gross-Pitaevskii equation (GPE). As proposals for interferometry and creating nonlocal quantum superpositions have been formed, it has become necessary to investigate effects not... Read More about Quantum theory of bright matter-wave solitons in harmonic confinement.

Fractional photon-assisted tunneling of ultra-cold atoms in periodically shaken double-well lattices (2012)
Journal Article
Esmann, M., Pritchard, J., & Weiss, C. (2012). Fractional photon-assisted tunneling of ultra-cold atoms in periodically shaken double-well lattices. Laser Physics Letters, 9(2), https://doi.org/10.1002/lapl.201110109

Fractional photon-assisted tunneling is investigated both numerically and analytically in a double-well lattice. While integer photon-assisted tunneling is a single-particle effect, fractional photon-assisted tunneling is an interaction-induced many-... Read More about Fractional photon-assisted tunneling of ultra-cold atoms in periodically shaken double-well lattices.

Distinguishing mesoscopic quantum superpositions from statistical mixtures in periodically shaken double wells (2012)
Journal Article
Weiss, C. (2012). Distinguishing mesoscopic quantum superpositions from statistical mixtures in periodically shaken double wells. Journal of Physics B: Atomic, Molecular and Optical Physics, 45(2), https://doi.org/10.1088/0953-4075/45/2/021002

For Bose–Einstein condensates in double wells, N-particle Rabi-like oscillations often seem to be damped. Far from being a decoherence effect, the apparent damping can indicate the emergence of quantum superpositions in the many-particle quantum dyna... Read More about Distinguishing mesoscopic quantum superpositions from statistical mixtures in periodically shaken double wells.

Spatial two-particle NOON-states in periodically shaken three-well potentials (2011)
Journal Article
Stiebler, K., Gertjerenken, B., Teichmann, N., & Weiss, C. (2011). Spatial two-particle NOON-states in periodically shaken three-well potentials. Journal of Physics B: Atomic, Molecular and Optical Physics, 44(5), https://doi.org/10.1088/0953-4075/44/5/055301

Few-particle dynamics in a three-well potential are investigated numerically. It is shown that periodically shaking the potential can considerably increase the fidelity of emerging spatial quantum superpositions. Such NOON-states are important for qu... Read More about Spatial two-particle NOON-states in periodically shaken three-well potentials.