Hannover 2016 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
Q: Fachverband Quantenoptik und Photonik
Q 42: Poster: Quantum Optics and Photonics III
Q 42.24: Poster
Wednesday, March 2, 2016, 16:30–19:00, Empore Lichthof
Entanglement Dynamics in Superconducting Phase Qudits under Pythagorean Control — •Daniel Basilewitsch1, Nadav Katz2, and Christiane Koch1 — 1Institute of Physics, University of Kassel, Kassel, Germany — 2Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem, Israel
Pythagorean control of a superconducting phase qudit has recently been demonstrated in first experiments. The concept of Pythagorean control generalizes population inversion in a two level system, which is solved by Rabi oscillations, to four levels. We analyze the observed state dynamics of the qudit and determine the available quantum gates when interpreting the four-level qudit as two coupled qubits. In the strong field regime, the state dynamics differs from that expected with Pythagorean control due to the presence of additional levels and the finite anharmonicity of the qudit ladder. Moreover, Pythagorean control is compromised by the coupling of the qudit to its environment, causing decoherence. We use optimal control theory (OCT) to adapt the analytical controls to the presence of additional levels and decoherence, to counter the effects of finite anharmonicity and to improve gate fidelities and times.