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Two Cold Atoms in a Harmonic Trap
Two ultracold atoms moving in a trap interact weakly at a very short distance. This interaction can be modeled by a properly regularized contact potential. We solve the corresponding time-independent…
Dark-bright solitons in inhomogeneous Bose-Einstein condensates.
It is shown that spatial inhomogeneity strongly affects dark-bright vector solitary wave solutions to the coupled nonlinear Schrödinger equations which describe an inhomogeneous two-species Bose-Einstein condensate, and that current technology suffices for their creation and control in ultracold trapped gases.
Measurement of collective excitations in a spin-orbit-coupled Bose-Einstein condensate
We measure the collective excitation spectrum of a spin-orbit-coupled Bose-Einstein condensate using Bragg spectroscopy. The spin-orbit coupling is generated by Raman dressing of atomic hyperfine…
Orthogonality catastrophe as a consequence of qubit embedding in an ultracold Fermi gas
We investigate the behavior of a two-level atom coupled to a one-dimensional, ultracold Fermi gas. The sudden switching on of the scattering between the two entities leads to the loss of any…
Non-Markovianity criteria for open system dynamics
A universal definition of non-Markovianity for open systems dynamics is proposed. It is extended from the classical definition to the quantum realm by showing that a `transition' from the Markov to…
Negative-Mass Hydrodynamics in a Spin-Orbit-Coupled Bose-Einstein Condensate.
- M. A. Khamehchi, Khalid Hossain, +4 authors P. Engels
- Physics, MedicinePhysical review letters
- 13 December 2016
An expanding spin-orbit coupled Bose-Einstein condensate whose dispersion features a region of negative effective mass is measured, observing a range of dynamical phenomena, including the breaking of parity and of Galilean covariance, dynamical instabilities, and self-trapping.
Fast quasiadiabatic dynamics
We work out the theory and applications of a fast quasiadiabatic approach to speed up slow adiabatic manipulations of quantum systems by driving a control parameter as near to the adiabatic limit as…
Alternate two-dimensional quantum walk with a single-qubit coin
We have recently proposed a two-dimensional quantum walk where the requirement of a higher dimensionality of the coin space is substituted with the alternance of the directions in which the walker…
Shaping the evanescent field of optical nanofibers for cold atom trapping.
We investigate trapping geometries for cold, neutral atoms that can be created in the evanescent field of a tapered optical fibre by combining the fundamental mode with one of the next lowest…
An efficient nonlinear Feshbach engine
We investigate a thermodynamic cycle using a Bose-Einstein condensate with nonlinear interactions as the working medium. Exploiting Feshbach resonances to change the interaction strength of the BEC…