Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 23: Poster I

Q 23.14: Poster

Tuesday, March 12, 2024, 17:00–19:00, Tent B

Optimal control of arbitrary perfectly entangling gates for open quantum systems — •Adrian Köhler and Christiane P. Koch — Freie Universität Berlin, Berlin, Germany

Perfectly entangling gates (PE) are crucial for various applications in quantum information. One method to realize these gates is with the help of an external control field, whose concrete shape is found using optimal control theory. Instead of optimizing the shape that realizes a specific gate, the optimization target can be extended to the full set of PE. This increases the flexibility of optimization and allows to find the best PE from the set of all PE. For unitary dynamics, the PE optimization functional can readily be evaluated. In contrast, for non-unitary dynamics, one has to approximate the unitary part of the dynamics first. We employ this technique to superconducting qubits, where we apply a cross-resonant drive to two coupled fixed-frequency transmons to generate entangled states.

Keywords: Perfect Entangler; Optimal control theory; Optimization algorithm; Open quantum systems