SAMOP 2023 – scientific programme
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A: Fachverband Atomphysik
A 18: Ultra-cold Plasmas and Rydberg Systems I (joint session A/Q)
A 18.5: Talk
Wednesday, March 8, 2023, 15:30–15:45, F303
Analysing crosstalk with the digital twin of a Rydberg atom QPU — •Alice Pagano1,2,3, Daniel Jaschke1,2,3, Sebastian Weber4, and Simone Montangero1,2,3 — 1Institute for Complex Quantum Systems, Ulm University — 2Dipartimento di Fisica e Astronomia "G. Galilei" & Padua Quantum Technologies Research Center, Università degli Studi di Padova — 3INFN, Sezione di Padova — 4Institute for Theoretical Physics III and Center for Integrated Quantum Science and Technology, Stuttgart University
Decoherence and crosstalk are two adversaries when aiming to parallelize a quantum algorithm: on the one hand, the execution of gates in parallel reduces decoherence due to a shorter runtime, but on the other hand, parallel gates in close proximity are vulnerable to crosstalk. This challenge is visible in Rydberg atom quantum computers where atoms experience strong van der Waals interactions decaying with distance. We demonstrate how the preparation of a 64-qubit GHZ state is affected by crosstalk in the closed system with the help of a tensor network digital twin of a Rydberg atom QPU. Then, we compare the error from crosstalk to the decoherence effects proving the necessity to parallelize algorithms.