Quantum 2025 – wissenschaftliches Programm
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TUE: Tuesday Contributed Sessions
TUE 6: Quantum Computing and Communication: Contributed Session I (Algorithms & Theory)
TUE 6.2: Vortrag
Dienstag, 9. September 2025, 14:30–14:45, ZHG007
Programmable quantum simulation of optics using block-encoding — •Siavash Davani1,2, Martin Gärttner3, and Falk Eilenberger4,1,2 — 1Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, 07745 Jena, Germany — 2Max Planck School of Photonics, 07745 Jena, Germany — 3Institute of Condensed Matter Theory and Optics, Friedrich-Schiller-University Jena, 07743 Jena, Germany — 4Fraunhofer-Institute for Applied Optics and Precision Engineering, 07745 Jena, Germany
The standard approach to developing algorithms for quantum computers involves constructing a sequence of unitary gates to manipulate a quantum register. We show an alternative approach that directly uses quantum information as instructions and performs a transformation on a register based on the state of the instruction state. This enables programming quantum computers by encoding different instructions as quantum information in the memory. The approach unifies the role of memory in quantum computers as containing both data and software similar to the von Neumann architecture in classical computers. Using this technique, we are able to a perform arbitrary phase transformations on wavefunctions, allowing for the simulation of large classes of Hamiltonians on quantum computers. We discuss the specific case of light propagation in weakly inhomogeneous media. The protocol functions by temporarily entangling the instruction and data registers, and it consumes the instruction state during the process.
Keywords: Quantum algorithm; Hamiltonian simulation; Quantum information; Quantum computing