| Hörsaal A1
Dr. Sonja Barkhofen
Photonic quantum walk systems can be considered as a standard model to describe the dynamics of quantum particles in a discretized environment and serve as a simulator for complex quantum systems, which are not as readily accessible. However, their experimental realization requires se- tups with increasing complexity in terms of number of modes and control of the system parameters.
Here, we employ an optical feedback loop based on an unbalanced Mach-Zehnder interferometer, which provides high homogeneity, precise control of the system parameters and optimal resource efficiency [1–3]. In this time-multiplexing scheme the walker’s position is mapped into the time domain including the requisite interference effects. The realisation of dynamic sinks in the walker’s dynamics by applying a deterministic in- and outcoupling enables us to study measurement induced effects and recurrence probabilities .
When using a looped Michelson interferometer geometry instead, we are able to implement a 4D coin space for a 1D walk by exploiting the two different travelling directions in the loop in addition to the polarization of the walker. Fast electro-optic modulators realising dynamic coin operations enable us to study coupled quantum walks and finite walks with periodic boundary conditions.
- A. Schreiber et al. “Photons Walking the Line: A Quantum Walk with Adjustable Coin Oper- ations,” PRL 104, 050502 (2010).
- A.Schreiberetal.“A 2D Quantum Walk Simulation of Two-Particle Dynamics,”Science 336 6077, 55–58 (2012).
- T.Nitscheetal.“Quantum walks with dynamical control,”New Journal of Physics 18, 063017 (2016).
- T. Nitsche et al. “Probing Measurement Induced Effects in Quantum Walks via Recurrence,” to appear in Science Advances (2018).
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