SAMOP 2023 – scientific programme
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QI: Fachverband Quanteninformation
QI 6: Poster I (joint session QI/Q)
QI 6.27: Poster
Monday, March 6, 2023, 16:30–19:00, Empore Lichthof
Driven Gaussian Quantum Walks — •Philip Held1, Melanie Engelkemeier1, Syamsundar De1, Sonja Barkhofen1, Jan Sperling2, and Christine Silberhorn1 — 1Paderborn University, Integrated Quantum Optics, Institute of Photonic Quantum Systems (PhoQS), Warburger Str. 100, 33098, Paderborn, Germany — 2Paderborn University, Theoretical Quantum Science, Institute of Photonic Quantum Systems (PhoQS), Warburger Str. 100, 33098, Paderborn, Germany
Quantum walks function as essential means to implement quantum simulators, allowing one to study complex and often directly inaccessible quantum processes in controllable systems. In this contribution, the new notion of a driven Gaussian quantum walk is presented. Here, instead of a unitary operation, a nonlinear map is used to describe the operation of the quantum walk in optical settings. Including nonlinear elements as core components, this type of quantum walk introduces quantumness of the dynamic itself, regardless of the input state. A parametric down-conversion is chosen as the nonlinear operation, introducing new walkers and squeezing during the evolution. To characterize nonlinear, quantum, and quantum-nonlinear effects following from this evolution, a full framework for driven Gaussian quantum walks is developed. In particular, the generation and amplification of highly multimode entanglement, squeezing, and other quantum effects are studied over the duration of the nonlinear walk.