Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 37: Poster III
Q 37.29: Poster
Wednesday, March 13, 2024, 17:00–19:00, Tent B
Extreme power spectre effects with special pulse shapes: Power narrowing and power broadening — •Ivo Mihov — Department of Physics, St Kliment Ohridski University of Sofia, 5 James Bourchier blvd, 1164 Sofia, Bulgaria
The effects of the excitation pulse shape on the transition line of the qubit are detrimental. Some pulse shapes are known to exhibit power broadening (the Rabi model). Others do not depend on the Rabi frequency whatsoever (the Rosen-Zener model). We have even shown that a family of pulse shapes reverse the power broadening effect and exhibits power narrowing instead. They have been theoretically and experimentally demonstrated using IBM Quantum hardware.
In this work we focus on pulse shapes that produce a case of extreme power broadening patterns. They are usually made of a convex shape that starts and ends with a sharp discontinuity, similar to the rectangular pulse shape. The two pulse shapes that were used throughout the experiment were of the form Ω1(t) = Ω0 t2N, where N is a non-negative integer, and Ω2(t) = Ω0 (1+β t2), where β can be any real number (may also be negative). We have experimentally shown an increase in the 9pi excitation maximum of our custom pulse by a factor of approximately 5 over the one with the simple rectangular pulse using IBM Quantum system ibmq_manila.
Keywords: narrowing; broadening; pulse shape; profile; IBM