Density-matrix formalism for the photoion-electron entanglement in atomic photoionization

Abstract

References (31)

Citing Articles

Download: PDF (477 kB) or Buy this Article (US$25) (Use Article Pack)

T. Radtke and S. Fritzsche
Institut für Physik, Universität Kassel, D-34132 Kassel, Germany

A. Surzhykov
Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany

Received 21 June 2006; published 27 September 2006

Thedensity-matrix theory, based on Dirac's relativistic equation, is applied forstudying the entanglement between the photoelectron and residual ion inthe course of the photoionization of atoms and ions. Inparticular, emphasis is placed on deriving the final-state density matrixof the overall system "photoion+electron," including interelectronic effects and thehigher multipoles of the radiation field. This final-state density matrixenables one immediately to analyze the change of entanglement asa function of the energy, angle and the polarization ofthe incoming light. Detailed computations have been carried out forthe 5s photoionization of neutral strontium, leading to a photoionin a 5s ²S J_f=1/2 level. It is found that thephotoion-electron entanglement decreases significantly near the ionization threshold and that,in general, it depends on both the photon energy andangle. The possibility to extract photoion-electron pairs with a well-defineddegree of entanglement may have far-reaching consequences for quantum informationand elsewhere.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.74.032709
DOI:	10.1103/PhysRevA.74.032709
PACS:	32.80.Fb; 31.25.-v; 03.67.Mn 32.80.Fb Photoionization of atoms and ions 31.25.-v Electron correlation calculations for atoms and molecules 03.67.Mn Quantum entanglement production, characterization, and manipulation YEAR: 2006
KEYWORDS:	strontium, density functional theory, quantum entanglement, photoionisation, atom-photon collisions, information theory

REFERENCES (31)

View in Separate Window/Tab

For access to fully linked references, you need to log in. For access to fully linked references, you need to Log in.

A. Einstein, B. Podolsky, and N. Rosen, Phys. Rev. 47, 777 (1935).
C. H. Bennett and S. J. Wiesner, Phys. Rev. Lett. 69, 2881 (1992).
A. K. Ekert, Phys. Rev. Lett. 67, 661 (1991).
L. K. Grover, Phys. Rev. Lett. 79, 325 (1997).
K.-N. Huang, Phys. Rev. A 22, 223 (1980).
S. Fritzsche, A. Surzhykov, and T. Stöhlker, Phys. Rev. A 72, 012704 (2005).
A. Surzhykov, U. D. Jentschura, T. Stöhlker, and S. Fritzsche, Phys. Rev. A 73, 032716 (2006).
G. Racah, Phys. Rev. 61, 186 (1941);

62, 438 (1942)

63, 367 (1943)

P. Rungta, V. Buek, C. M. Caves, M. Hillery, and G. J. Milburn, Phys. Rev. A 64, 042315 (2001).
K. Chen, S. Albeverio, and S.-M. Fei, Phys. Rev. Lett. 95, 040504 (2005).
W. K. Wootters, Phys. Rev. Lett. 80, 2245 (1998).
S. Ricz, J. Nikkinen, R. Sankari, T. Ricsóka, Á. Kövér, D. Varga, S. Fritzsche, H. Aksela, and S. Aksela, Phys. Rev. A 72, 014701 (2005).
M. K. Inal, A. Surzhykov, and S. Fritzsche, Phys. Rev. A 72, 042720 (2005).