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MPQ-MPIPKS

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Participants and contributions

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MPIPKS

  • Many-body physics:
    • Alexey Ponomarev - Spectral and dynamical properties of Fermi-Bose mixtures (Nonlinear Dynamics in Quantum Systems)
    • Thomas Wellens - Multiple scattering in nonlinear media (Senior talk) (Uni Erlangen)
    • Peter Schlagheck - Correlation and many-body physics in the transport of Bose-Einstein condensates (Uni Regensburg)
    • Patrick Ploetz - Response functions for one-dimensional interacting electrons (Uni Heidelberg)
Abstract We investigate the 'standard model' for interacting electrons in one dimension---the Tomonaga-Luttinger model---and sketch a pedestrian approach to its solution. Going beyond the linear dispersion of the original exactly solvable model, response functions are calculated which are well known and directly related to correlation functions used in condensed matter physics. We present results for the dynamical density response function, the latter playing a major role for probing one-dimensional systems by scattering experiments.
Abstract Quantum systems composed of two qubits constitute the starting point for the study of quantum entanglement. The evolution of entanglement when such a system is subject to open system dynamics will be examined in this talk. We will derive a simple factorization relation which describes the systems' final entanglement after one of the qubits has undergone an arbitrary physical process.
  • Malena Hor-Meyll - Open system entanglement dynamics with twin-photons
Abstract We demonstrate both local and global dynamics of two-level systems using an all-optical experimental setup. We show the asymptotic decay of a single-particle system and the finite time disentanglement of a bipartite system induced by interaction with the environment.
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MPQ

  • Many-body physics:
    • Diego Porras - Mesoscopic spin boson models of trapped ions (Theory Division)
  • Quantum Information:
Abstract The usual scenario in fault tolerant quantum computation involves certain amount of qubits encoded in each code block, transversal operations between them and destructive measurements of ancillary code blocks. We introduce a new approach in which a single code layer is used for the entire computation, in particular a surface code. Qubits can be created, manipulated and non-destructively measured by code deformations that amount to `cut and paste' operations in the surface. All the interactions between qubits remain purely local in a two-dimensional setting.
  • Experiments:
  • Olivier Arcizet - Towards quantum optic with micro-mechanical resonators (Lab of Photonics)
Abstract I will first present some of the quantum effects one can expect when coupling an optical field and a micro-mechanical resonator and the recent advances in order to measure the spatial extension of a macroscopic mechanical oscillators wave function down to its ground state. I will then present the experimental work on optomechanics performed at MPQ, working on micro-toroidal cavities and their interest in such a quest.
Abstract If bosons strongly repel each other, then their wave functions try to avoid spatial overlap. This is called fermionization and was first studied by Girardeau in a one dimensional gas. The wave function for the ground state of the bosons closely resembles that of a gas of fermions. While Girardeau's treatment assumed an elastic interaction between the bosons, we study the case of inelastic interactions. Interestingly, strong interactions lead to the same behavior, i.e., a strong suppression of the probability to find two bosons at the same point. This quantity is inferred from measurements of the loss rate of the many-body system in our experiment.
Abstract Laser driven electron acceleration in a plasma wakefield offers several advantages over conventional accelerator techniques. Inside plasma electric fields can be several orders of magnitude larger (up to TV/m) than in RF-accelerator cavities. This leads to a substantial shortening of acceleration distances. Therefore GeV electron beams can be accelerated within centimeters. We study laser wakefield acceleration by coupling the 20 TW ATLAS laser beam (45 fs) into a 15 mm long plasma channel. The plasma channel is generated inside a hydrogen-filled sapphire capillary by a 20kV electric discharge. Quasi-monoenergetic electron bunches with energies as high as 500 MeV have been detected.
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Program

Time -Thursday 27- -Friday 28- -Saturday 29-
10.00-10.30
/\
Patrick
/\
10.30-11.00
Visit
Henning
The
11.00-11.30
to
Coffee break
Match
11.30-12.00
the labs
Héctor 1
\/
12.00-12.30
\/
Héctor 2
...
12.30-14.30
Lunch break
Lunch break
Lunch
14.30-15.00
Peter
Sébastien
15.00-15.30
Stephan
Markus
15.30-16.00
Alexey
Diego
16.00-16.30
Coffee break
Coffee break
16.30-17.00
Olivier
Thomas 1
17.00-17.30
Malena
Thomas 2
17.30-18.00
cancelled
...
19.00
Workshop dinner
...
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Sketch of sporting program

  • Soccer match: Saturday 11-13 am @ IPP's field (warm-up starting at 10am)
  • Referee: Arnold Steyer (unavailable after all)
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Accommodation for MPIPKS'

  • Malena, Markus and Doreen @ Maria's (Munich)
  • Alejo @ Jörg's (Munich)
  • Alexey, Thomas and Fernando @ Geza's (Garching)


Comments, suggestions, ideas... mail them to maria.eckholt AT mpq.mpg.de

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