| |
What we
do
In this project we operate quadrature entangled laser beams that previously have been used to demonstrate quantum teleportation [1, 2]. Recently we performed the full experimental characterization of a quantum channel from such beams [3] building on earlier experimental work on entanglement characterization [4]. In another experiment we demonstrated strong entanglement of optical modulation fields [5] building on earlier work by the groups from Erlangen, Canberra and St Lucia [6]. In [7] we proposed an experimentally feasible purification and distillation protocol for squeezed and entangled states to counteract phase fluctuations in optical transmission channels. The protocol has been demonstrated for squeezed states in [8].
This project is supported by the Deutsche Forschungsgemeinschaft through Project SCHN 757/2-"Experimental Purification of Squeezed and Entangled States".
[1] A. Furusawa, J. L. Sřrensen, S. L. Braunstein, C. A. Fuchs, H. J. Kimble, and
E. S. Polzik, Science 282, 706 (1998)
[2] W. P. Bowen, N. Treps, B. C. Buchler, R. Schnabel, T. C. Ralph, Hans-A. Bachor,
T. Symul, and P. K. Lam, Phys. Rev. A 67, 032302 (2003)
[3] J. DiGuglielmo, Diploma Thesis, Hannover 2006
[4] W. P. Bowen, R. Schnabel, P. K. Lam, and T. C. Ralph:
An experimental investigation of criteria for continuous variable entanglement,
Phys. Rev. Lett. 90, 043601 (2003)
[5] A. Samblowski, Diploma Thesis, Hannover, May 2007
[6] E. H. Huntington et al.: Demonstration of the spatial separation of the entangled quantum sidebands of an optical field, Phys. Rev. A 71, 041802(R) (2005)
[7] Jaromír Fiurášek, Petr Marek, Radim Filip, and Roman Schnabel, Experimentally feasible purification of continuous-variable entanglement, Phys. Rev. A 75, 050302(R) (2007)
[8] A. Franzen, B. Hage, J. DiGuglielmo, and R. Schnabel,
Experimental demonstration of continuous variable purification of squeezed states,
Phys. Rev. Lett. 97, 150505 (2006)
|
|
Alexander Franzen ( Ph. D.
Student )
Boris Hage ( Ph.D. Student )
James DiGuglielmo (Diploma
Student)