Zobrazeno 1 - 10
of 51
pro vyhledávání: '"Hessmo, Björn"'
Autor:
Guo, Qinda, Dendzik, Maciej, Grubišić-Čabo, Antonija, Berntsen, Magnus H., Li, Cong, Chen, Wanyu, Matta, Bharti, Starke, Ulrich, Hessmo, Björn, Weissenrieder, Jonas, Tjernberg, Oscar
Publikováno v:
Structural Dynamics 9.2 (2022): 024304
Here we present a high repetition rate, narrow band-width, extreme ultraviolet (XUV) photon source for time- and angle-resolved photoemission spectroscopy (tr-ARPES). The narrow band width pulses $\Delta E=9, 14, 18$ meV for photon energies $h\nu=10.
Externí odkaz:
http://arxiv.org/abs/2201.12456
Here we report of a design and the performance of an optimized micro-fabricated conveyor belt for precise and adiabatic transportation of cold atoms. A theoretical model is presented to determine optimal currents in conductors used for the transporta
Externí odkaz:
http://arxiv.org/abs/1704.03030
Publikováno v:
Opt. Express 25, 7960 (2017)
We demonstrate a two-photon transition of rubidium (Rb) atoms from the ground state (5$S_{1/2}$) to the excited state (4$D_{5/2}$), using a home-built ytterbium (Yb)-doped fiber amplifier at 1033 nm. This is the first demonstration of an atomic frequ
Externí odkaz:
http://arxiv.org/abs/1612.01815
Publikováno v:
Eur. Phys. J. D (2022)76:137
We study magnetic traps with very high trap frequencies where the spin is coupled to the motion of the atom. This allows us to investigate how the Born-Oppenheimer approximation fails and how effective magnetic and electric fields appear as the conse
Externí odkaz:
http://arxiv.org/abs/1605.09126
Publikováno v:
Phys. Rev. A 92, 052108 (2015)
The adiabatic Aharonov-Bohm (AB) effect is a manifestation of the Berry phase acquired when some slow variables take a planar spin around a loop. While the effect has been observed in molecular spectroscopy, direct measurement of the topological phas
Externí odkaz:
http://arxiv.org/abs/1503.02322
Autor:
Hessmo, Björn
When light exhibits particle properties, and when matter exhibits wave properties quantum mechanics is needed to describe physical phenomena. A two-photon source produces nonmaximally entangled photon pairs when the source is small enough to diffract
Externí odkaz:
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-1208
Autor:
Johansson, Markus, Sjöqvist, Erik, Andersson, L. Mauritz, Ericsson, Marie, Hessmo, Björn, Singh, Kuldip, Tong, D. M.
Publikováno v:
Phys. Rev. A 86, 062322 (2012)
The robustness to different sources of error of the scheme for non-adiabatic holonomic gates proposed in [New J. Phys. {\bf 14}, 103035 (2012)] is investigated. Open system effects as well as errors in the driving fields are considered. It is found t
Externí odkaz:
http://arxiv.org/abs/1204.5144
Autor:
Sjöqvist, Erik, Tong, D. M., Andersson, L. Mauritz, Hessmo, Björn, Johansson, Markus, Singh, Kuldip
Publikováno v:
New J. Phys. 14, 103035 (2012)
We develop a non-adiabatic generalization of holonomic quantum computation in which high-speed universal quantum gates can be realized by using non-Abelian geometric phases. We show how a set of non-adiabatic holonomic one- and two-qubit gates can be
Externí odkaz:
http://arxiv.org/abs/1107.5127
Publikováno v:
Phys. Rev. A 79, 021804 (2009)
We demonstrate a robust fiber-optics-based fluorescence detector, fully integrated on an atom chip, which detects single atoms propagating in a guide with 66% efficiency. We characterize the detector performance and the atom flux by analyzing the pho
Externí odkaz:
http://arxiv.org/abs/0903.3896
Autor:
Wilzbach, Marco, Heine, Dennis, Groth, Sönke, Liu, Xiyuan, Raub, Thomas, Hessmo, Björn, Schmiedmayer, Jörg
Publikováno v:
Optics Letters, Vol. 34, page 259 (2009)
We present a reliable and robust integrated fluorescence detector capable of detecting single atoms. The detector consists of a tapered lensed single-mode fiber for precise delivery of excitation light and a multimode fiber to collect the fluorescenc
Externí odkaz:
http://arxiv.org/abs/0801.3255