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QI: Fachverband Quanteninformation

QI 12: Poster I

QI 12.9: Poster

Dienstag, 19. März 2024, 11:00–14:30, Poster B

On the generalisation of dynamic decoupling sequences for quantum systems — •Colin Read¹ and John Martin² — ¹Institut de Physique Nucléaire, Atomique et de Spectroscopie, CESAM, Université de Liège, Belgium — ²Institut de Physique Nucléaire, Atomique et de Spectroscopie, CESAM, Université de Liège, Belgium

Although qubits are the most common elementary quantum systems for storing and processing quantum information, current efforts aim at using quantum systems with more than two levels (qudits) to enhance the performance of certain quantum technologies. The main challenge to the realisation of most quantum technologies (both qubit and qudit-based) is decoherence, that is the loss of information in the environment generated by an unwanted interaction of the system with its environment. While many schemes have been developed to correct or mitigate errors in qubit systems due to decoherence, similar schemes for qudits are still very little explored. One such scheme, named Dynamical Decoupling (DD), aims at periodically interacting with the quantum system by means of a carefully designed sequence of pulses in order to average out this interaction. In this work, we present some results on the qudit generalization of qubit-DD. Using several different numerical methods, we construct some qudit pulse sequences and compare them with their qubit counterpart. We also show that, by using balanced multiple driving pulses, we can directly apply known results for pulse placement optimisation to achieve a higher order of decoherence suppression using a smaller number of pulses.

Keywords: Dynamical Decouling; Decoherence; Qudit; Quantum Error Mitigation