TY  - JOUR
A1  - Pieplow, Gregor
A1  - Henkel, Carsten
T1  - Cherenkov friction on a neutral particle moving parallel to a dielectric
JF  - Journal of physics : Condensed matter
N2  - We describe a simple mechanism of quantum friction for a particle moving parallel to a dielectric, based on a fully relativistic framework and the assumption of local equilibrium. The Cherenkov effect explains how the bare ground state becomes globally unstable and how fluctuations of the electromagnetic field and the particle's dipole are converted into pairs of excitations. Modeling the particle as a silver nano-sphere, we investigate the spectrum of the force and its velocity dependence. We find that the damping of the plasmon resonance in the silver particle has a relatively strong impact near the Cherenkov threshold velocity. We also present an expansion of the friction force near the threshold velocity for both damped and undamped particles.
KW  - quantum friction
KW  - quantum electrodynamics
KW  - Cherenkov radiation
KW  - transition radiation
KW  - fluctuation forces
Y1  - 2015
U6  - https://doi.org/10.1088/0953-8984/27/21/214001
SN  - 0953-8984
SN  - 1361-648X
VL  - 27
IS  - 21
PB  - IOP Publ. Ltd.
CY  - Bristol
ER  - 
TY  - JOUR
A1  - Elsner, Robert
A1  - Puhlmann, Dirk
A1  - Pieplow, Gregor
A1  - Heuer, Axel
A1  - Menzel, Ralf
T1  - Transverse distinguishability of entangled photons with arbitrarily shaped spatial near- and far-field distributions
JF  - Journal of the Optical Society of America : B, Optical physics
N2  - Entangled photons generated by spontaneous parametric downconversion are ubiquitous in quantum optics. In general, they exhibit a complex spatial photon count distribution. This spatial structure is responsible for seemingly surprising results concerning, e.g., complementarity such as the apparent simultaneous observation of interference fringes V and which-way information D at a double slit, as recently reported by Menzel et al. [Proc. Natl. Acad. Sci. USA 109, 9314 (2012)]. We implement a complete quantitative model of the SPDC interaction that fully incorporates the effects of crystal anisotropies, phase matching, and the pump beam structure and allows for arbitrary manipulations of the SPDC light in the near and far fields. This enables us to establish an upper bound D-2 + V-2 <= 1.47 for the experimental parameters reported by Menzel et al. We report new experimental results that agree excellently with these theoretical predictions. The new model enables a detailed quantitative analysis of this surprising result and the fair sampling interpretation of biphotons passing a double slit. (C) 2015 Optical Society of America
Y1  - 2015
U6  - https://doi.org/10.1364/JOSAB.32.001910
SN  - 0740-3224
SN  - 1520-8540
VL  - 32
IS  - 9
SP  - 1910
EP  - 1919
PB  - Optical Society of America
CY  - Washington
ER  -