====== Joachim Schäfer ======

{| class="portrait"
|-
| style="width:159px;" rowspan="4" | <box w=150px border left>{{members:joschaef:joschaef.jpg?nolink&150}}</box> 
! style="width:50px;"| Email:
| style="width:541px;"| joschaef (at) ulb.ac.be
|-
! Phone:
| +32-2-650 29 56
|-
! Fax:
| +32-2-650 29 41
|-
! Address:
| QuIC - Ecole Polytechnique de Bruxelles \\ Université Libre de Bruxelles \\ 50 av. F. D. Roosevelt - CP 165/59 \\ B-1050 Bruxelles \\ Belgique
|}

=== Short biography ===
  * Born in 1984 in Mainz, Germany.
  * I started my physics studies at the [[http://www.uni-mainz.de|Johannes-Gutenberg Universität]], Mainz in 2003.
  * From summer 2006 to end of spring 2007 I did an Erasmus term at the [[http://www.kth.se|Kungliga Tekniska Högskolan KTH]], Stockholm, Sweden.
  * After my final exams I did the last year of my studies (the diploma thesis/"Diplomarbeit") from beginning 2008 to beginning 2009, at our service QuIC under the direction of Nicolas J. Cerf in collaboration with Arno Rauschenbeutel (now head of the group [[http://ati.tuwien.ac.at/research_areas/applied_quantum_physics/startpage/EN/|Applied Quantum Physics]] in Vienna). 
  * Since spring 2009 I am a PhD student at QuIC in the field of continuous variable communication

=== Research interests === 
  * Quantum Information Theory
  * Quantum Channels
  * Quantum Key Distribution with Continuous Variables
  * Quantum Repeaters

=== Teaching ===
  * Théorie de l'Information (2009/2010)
  * Théorie de l'Information (2010/2011)
  * Mécanique Quantique I (2010/2011)
  * Mécanique Quantique I (2011/2012)
  * Information Theory (2011/2012)

=== Master Thesis ===
Master Thesis (PDF file): {{publications:2009-diplomarbeit-joachim-schaefer.pdf|"Classical Capacity of a Bosonic Channel with Gauss-Markov Noise"}}

=== PhD Thesis ===
PhD Thesis (PDF file): {{publications:2013-phd-thesis-joachim-schaefer-v2.pdf|"Information Transmission Through Bosonic Gaussian Quantum Channels"}}

=== Publications ===
//Gaussian classical capacity of Gaussian quantum channels (Proceedings Paper)//,\\
E. Karpov, J. Schäfer, R. Garcia-Patron, O. V. Pilyavets, and N. J. Cerf\\
Nanosystems: Physics, Chemistry, Mathematics **4**, 496 (2013).\\
{{:publications:2013-NPCM-4-496.pdf|PDF file}}

//Equivalence relations for the classical capacity of single-mode Gaussian quantum channels//, \\
Joachim Schäfer, Evgueni Karpov, Raúl García-Patrón, Oleg V. Pilyavets and Nicolas J. Cerf, \\
Phys. Rev. Lett. **111**, 030503 (2013),\\
DOI: [[http://prl.aps.org/abstract/PRL/v111/i3/e030503|10.1103/PhysRevLett.111.030503]],\\
{{publications:2013-PRL-111-030503.pdf|PDF file}}, {{publications:2013-PRL-111-030503-SuppMat.pdf|Supp. Mat.}},
[[http://arxiv.org/abs/arXiv:1303.4939|arXiv:1303.4939 [quant ph] ]]

//Gaussian matrix-product states for coding in bosonic communication channels//,\\
Joachim Schäfer, Evgueni Karpov and Nicolas J. Cerf, \\
Phys. Rev. A **85**, 012322 (2012),\\
DOI: [[http://pra.aps.org/abstract/PRA/v85/i1/e012322|10.1103/PhysRevA.85.012322]],\\
{{publications:2012-PRA-85-012322.pdf|PDF file}},
[[http://arxiv.org/abs/1201.0200|arXiv:1201.0200 [quant ph] ]]

//Gaussian capacity of the quantum bosonic memory channel with additive correlated Gaussian noise//, \\
Joachim Schäfer, Evgueni Karpov and Nicolas J. Cerf, \\
Phys. Rev. A **84**, 032318 (2011),\\
DOI: [[http://pra.aps.org/abstract/PRA/v84/i3/e032318|10.1103/PhysRevA.84.032318]],\\
{{publications:2011-PRA-84-032318.pdf|PDF file}},
[[http://arxiv.org/abs/1011.4118|arXiv:1011.4118 [quant ph] ]]

//Quantum water-filling solution for the capacity of Gaussian information channels (Proceedings Paper)//, \\
Joachim Schäfer, Evgueni Karpov and Nicolas J. Cerf, \\
Proceedings of SPIE, Vol. **7727**, 77270J (2010),\\
DOI: [[http://spie.org/x648.html?product_id=854641|10.1117/12.854641]],\\
{{:members:joschaef:Quantum_water-filling_one_mode_SPIE_Proceedings_7727_18.pdf|PDF file}}

//Capacity of a bosonic memory channel with Gauss-Markov noise//, \\
Joachim Schäfer, David Daems, Evgueni Karpov and Nicolas J. Cerf, \\
Phys. Rev. A **80**, 062313 (2009),\\
DOI: [[http://pra.aps.org/abstract/PRA/v80/i6/e062313|10.1103/PhysRevA.80.062313]],\\
{{publications:2009-PRA-80-062313.pdf|PDF file}},
[[http://arxiv.org/abs/arXiv:0907.0982|arXiv:0907.0982 [quant ph] ]]