Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 44: Quantum Information (Concepts and Methods) III

Q 44.1: Talk

Thursday, March 14, 2019, 10:30–10:45, S HS 001 Chemie

States that can be reached with hybrid algorithms — •Joachim Welz, Filip Wudarski, and Andreas Buchleitner — Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Germany

Recent developments in quantum computer’s architecture have allowed us to run proof-of-principle hybrid quantum-classical algorithms. One of the most prominent examples of the latter is the Variational Quantum Eigensolver (VQE) that searches Hilbert space for the ground state of arbitrary Hamiltonians. Here, we discuss the structure of quantum circuits running the VQE in order to identify the space of reachable states. We analytically investigate 2-qubit Hamiltonians and formulate conditions for obtaining the ground state. Finally, we present limitations and restrictions for higher-dimensional (n-qubit) problems.