Quantum friction in arbitrarily directed motion
Abstract
In quantum friction, the electromagnetic fluctuationinduced frictional force decelerating an atom which moves past a macroscopic dielectric body, has so far eluded experimental evidence despite more than three decades of theoretical studies. Inspired by the recent finding that dynamical corrections to such an atom's internal dynamics are enhanced by one order of magnitude for vertical motion—compared with the paradigmatic setup of parallel motion—here we generalize quantum friction calculations to arbitrary angles between the atom's direction of motion and the surface in front of which it moves. Motivated by the disagreement between quantum friction calculations based on Markovian quantum master equations and timedependent perturbation theory, we carry out our derivations of the quantum frictional force for arbitrary angles by employing both methods and compare them.
 Authors:
 Albert Ludwig Univ., Freiburg (Germany)
 Univ. City, Buenos Aires (Argentina)
 Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
 Publication Date:
 Research Org.:
 Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
 Sponsoring Org.:
 USDOE
 OSTI Identifier:
 1374345
 Report Number(s):
 LAUR1629049
Journal ID: ISSN 24699926; PLRAAN
 Grant/Contract Number:
 AC5206NA25396
 Resource Type:
 Journal Article: Accepted Manuscript
 Journal Name:
 Physical Review A
 Additional Journal Information:
 Journal Volume: 95; Journal Issue: 5; Journal ID: ISSN 24699926
 Publisher:
 American Physical Society (APS)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 74 ATOMIC AND MOLECULAR PHYSICS; Atomic and Nuclear Physics
Citation Formats
Klatt, J., Farías, M. Belen, Dalvit, D. A. R., and Buhmann, S. Y.. Quantum friction in arbitrarily directed motion. United States: N. p., 2017.
Web. doi:10.1103/PhysRevA.95.052510.
Klatt, J., Farías, M. Belen, Dalvit, D. A. R., & Buhmann, S. Y.. Quantum friction in arbitrarily directed motion. United States. doi:10.1103/PhysRevA.95.052510.
Klatt, J., Farías, M. Belen, Dalvit, D. A. R., and Buhmann, S. Y.. Tue .
"Quantum friction in arbitrarily directed motion". United States.
doi:10.1103/PhysRevA.95.052510.
@article{osti_1374345,
title = {Quantum friction in arbitrarily directed motion},
author = {Klatt, J. and Farías, M. Belen and Dalvit, D. A. R. and Buhmann, S. Y.},
abstractNote = {In quantum friction, the electromagnetic fluctuationinduced frictional force decelerating an atom which moves past a macroscopic dielectric body, has so far eluded experimental evidence despite more than three decades of theoretical studies. Inspired by the recent finding that dynamical corrections to such an atom's internal dynamics are enhanced by one order of magnitude for vertical motion—compared with the paradigmatic setup of parallel motion—here we generalize quantum friction calculations to arbitrary angles between the atom's direction of motion and the surface in front of which it moves. Motivated by the disagreement between quantum friction calculations based on Markovian quantum master equations and timedependent perturbation theory, we carry out our derivations of the quantum frictional force for arbitrary angles by employing both methods and compare them.},
doi = {10.1103/PhysRevA.95.052510},
journal = {Physical Review A},
number = 5,
volume = 95,
place = {United States},
year = {Tue May 30 00:00:00 EDT 2017},
month = {Tue May 30 00:00:00 EDT 2017}
}
Web of Science

We propose a method for arbitrary manipulations of a quantum wave packet in an optical lattice by a suitable modulation of the lattice amplitude. A theoretical model allows us to determine the modulation needed to generate an arbitrary atomic trajectory; wavepacket rotations can also be implemented. The method is immediately usable in stateoftheart experiments.

Arbitrarily small amounts of correlation for arbitrarily varying quantum channels
As our main result show that in order to achieve the randomness assisted message and entanglement transmission capacities of a finite arbitrarily varying quantum channel it is not necessary that sender and receiver share (asymptotically perfect) common randomness. Rather, it is sufficient that they each have access to an unlimited amount of uses of one part of a correlated bipartite source. This access might be restricted to an arbitrary small (nonzero) fraction per channel use, without changing the main result. We investigate the notion of common randomness. It turns out that this is a very costly resource – generically, itmore » 
Arbitrarily small amounts of correlation for arbitrarily varying quantum channels
As our main result show that in order to achieve the randomness assisted message and entanglement transmission capacities of a finite arbitrarily varying quantum channel it is not necessary that sender and receiver share (asymptotically perfect) common randomness. Rather, it is sufficient that they each have access to an unlimited amount of uses of one part of a correlated bipartite source. This access might be restricted to an arbitrary small (nonzero) fraction per channel use, without changing the main result. We investigate the notion of common randomness. It turns out that this is a very costly resource – generically, itmore » 
Theory of wave interaction in an arbitrarily directed magnetic field. Polarization of the medium
A method is proposed for calculating the electric polarization of a medium in an arbitrarily directed magnetic field H when the Lande factors of the energy levels are not the same. A theory of the interaction of electromagnetic waves with different polarization vectors is developed on the basis of this method. The theory is presented in two versions: (1) as applied to the analysis of spectroscopic effects, and (2) for investigating lasers with anisotropic cavities. Formulas are obtained for the frequency difference and intensity difference of opposing waves in a ring laser for arbitrary wave polarization vectors and for anmore »