Zobrazeno 1 - 10
of 165
pro vyhledávání: '"Johnson, T. H."'
Publikováno v:
Phys. Rev. Lett. 116, 240402 (2016)
We investigate cold bosonic impurity atoms trapped in a vortex lattice formed by condensed bosons of another species. We describe the dynamics of the impurities by a bosonic Hubbard model containing occupation-dependent parameters to capture the effe
Externí odkaz:
http://arxiv.org/abs/1512.09334
Publikováno v:
Phys. Rev. A 93, 053619 (2016)
Estimating the temperature of a cold quantum system is difficult. Usually, one measures a well-understood thermal state and uses that prior knowledge to infer its temperature. In contrast, we introduce a method of thermometry that assumes minimal kno
Externí odkaz:
http://arxiv.org/abs/1508.02992
Publikováno v:
Phys. Rev. A 91, 013611 (2015)
We introduce a detector that selectively probes the phononic excitations of a cold Bose gas. The detector is composed of a single impurity atom confined by a double-well potential, where the two lowest eigenstates of the impurity form an effective pr
Externí odkaz:
http://arxiv.org/abs/1411.0688
Publikováno v:
Phys. Rev. Lett. 114, 090602 (2015)
Estimating the expected value of an observable appearing in a non-equilibrium stochastic process usually involves sampling. If the observable's variance is high, many samples are required. In contrast, we show that performing the same task without sa
Externí odkaz:
http://arxiv.org/abs/1410.3319
Publikováno v:
EPJ Quantum Technology 2014, 1:10
Quantum simulators are devices that actively use quantum effects to answer questions about model systems and, through them, real systems. Here we expand on this definition by answering several fundamental questions about the nature and use of quantum
Externí odkaz:
http://arxiv.org/abs/1405.2831
Publikováno v:
Phys. Rev. A 87, 043613 (2013)
We derive ab initio local Hubbard models for several optical lattice potentials of current interest, including the honeycomb and Kagom\'{e} lattices, verifying their accuracy on each occasion by comparing the interpolated band structures against the
Externí odkaz:
http://arxiv.org/abs/1303.2213
Publikováno v:
Scientific Reports 3, 1235 (2013)
Simulating quantum circuits using classical computers lets us analyse the inner workings of quantum algorithms. The most complete type of simulation, strong simulation, is believed to be generally inefficient. Nevertheless, several efficient strong s
Externí odkaz:
http://arxiv.org/abs/1209.6010
Publikováno v:
Europhys. Lett. 98 (2012) 26001
Motivated by a recent experiment [J. Catani et al., arXiv:1106.0828v1 preprint, 2011], we study breathing oscillations in the width of a harmonically trapped impurity interacting with a separately trapped Bose gas. We provide an intuitive physical pi
Externí odkaz:
http://arxiv.org/abs/1111.6154
Publikováno v:
Phys. Rev. A 84, 023617 (2011)
Using near-exact numerical simulations we study the propagation of an impurity through a one-dimensional Bose lattice gas for varying bosonic interaction strengths and filling factors at zero temperature. The impurity is coupled to the Bose gas and c
Externí odkaz:
http://arxiv.org/abs/1106.3650
Publikováno v:
Phys. Rev. A 82, 043617 (2010)
We present an analysis of Bose-Fermi mixtures in optical lattices for the case where the lattice potential of the fermions is tilted and the bosons (in the superfluid phase) are described by Bogoliubov phonons. It is shown that the Bogoliubov phonons
Externí odkaz:
http://arxiv.org/abs/1007.3828