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MA: Fachverband Magnetismus

MA 18: Transport: Quantum Coherence and Quantum Information Systems - Theory (jointly with MA, HL)

MA 18.14: Vortrag

Dienstag, 21. März 2017, 13:00–13:15, HSZ 103

Interplay of Hamiltonian control and and decoherence: a caveat, some hope and a new simulation strategy — •Jürgen Stockburger — Institute for Complex Quantum Systems, Ulm University

Hamiltonian control and decoherence are intricately intertwined in low-temperature quantum systems. For controls which act on timescales shorter than the thermal time ℏβ, Markovianity can no longer be assumed (RWA breakdown) [1]. When open-system dynamics is mapped on a stochastic propagation, this case can be treated exactly, and standard optimal control techniques can be used to explore synergy effects between control and reservoir interaction. Quantum states can thus be purified [2] and systems entangled [3] by the combined effect of local control and dissipation.

This stochastic mapping can now be combined with non-perturbative projection techniques, requiring only moderate computational resources [4].
[1] Alicki, R., Lidar, D. A. and Zanardi, P., Phys. Rev. A 73, 052311 (2006)
[2] Schmidt, R. et al., Phys. Rev. Lett. 107, 130404 (2011)
[3] Schmidt, R., Stockburger, J. T. and Ankerhold, J., Phys. Rev. A 88, 052321 (2013)
[4] Stockburger, J. T., EPL (Europhysics Letters) 115, 40010 (2016)