Speaker
Description
Surface electrode ion traps are one of the most promising platforms in the context of scalable quantum computing hardware. With high-fidelity qubits, long coherence times and all-to-all connectivity the elementary requirements are fulfilled. The ongoing challenge lies in scaling up the systems in terms of the number of trapped ions and controlled qubits, a process which necessitates improvements in hardware, as well as in experimental techniques.
I present the current status of the laser system and progress towards the implementations of motional state measurements. These are steps towards sympathetic cooling which is a technique that enables the motional cooling of logical ions without destroying the stored quantum information. While this has been demonstrated in a variety of experiments, our microwave driven two-qubit gates require a more complex three ion mixed species crystal: 43Ca+---88Sr+--- 43Ca+. To be able to characterize the motional modes and their couplings we use multiple lasers especially such ones driving narrow-line width electric-quadrupole transitions (729nm and 674nm).
The goal is to couple the mode used for the two-qubit gate with an easily sympathetically cooled mode. This is beneficial for cooling ions right before performing gates, since the ion transport will inevitably lead to some amount of heating. The development of sympathetic cooling in a simple chip is expected to be directly transferable to an upcoming X-junction chip, where ions will need to be sympathetically cooled during longer algorithms.
| Academic level | PhD student |
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