Quantum circuits

Enhancing quantum bosonic codes

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Dr. Mikael Kervinen

Dr. Mikael Kervinen

Chalmers University of Technology, Sweden

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TestimonialProduct: Presto

Summary

Challenge: Researching bosonic encodings in superconducting 3D cavities requires a complex experimental setup. The team faced bottlenecks due to slow data transfer when iterating pulse shapes and the complexity of managing multiple instruments for flux control, pumping, and signal generation.

Solution: Presto consolidates the entire experiment into one instrument. By using onboard template storage, the team eliminated data-transfer overhead during iterations. Furthermore, Presto’s unified Python API provides simultaneous control over DC-bias, high-frequency pumps, and pulse generation.
Figure 1

X-gate in binomial encoding. The gate is defined by mapping the six cardinal states in the encoded subspace to their respective targets. The gate is defined only for the encoded subspace, but in the paper, Kervinen et al. show that they can characterize it generally by analyzing its action on the full Hilbert space and not just the cardinal states. On the right you can see the experimental Wigner functions of Fock state |2> being transformed into a superposition (|0>+|4>)/2 by the action of the X-gate.

Enhancing quantum bosonic codes

Q: Can you introduce yourself and describe the focus of your research?
A: I am a postdoctoral researcher working with Assistant Professor Simone Gasparinetti. My focus is quantum information processing using bosonic encodings within superconducting 3D cavities. So far, we have successfully created and characterized bosonic states and gates, and we are currently working on extending the lifetime of bosonic qubits.

Q: One of the major bottlenecks in quantum research is often data transfer and calibration time. How has Presto helped streamline your workflow?
A: Presto has proven to be a vital tool. Its exceptional capability to store templates in memory has saved us countless hours. It eliminated the need to upload new pulse shapes for every single iteration. This feature allows us to iterate through various amplitudes and frequencies seamlessly.

Q: Quantum control requires complex programming. How did you find the experience of interacting with the Presto software?
A: That is one of the standout features. The Python API is very user-friendly and simplifies the design of complex pulse sequences. With Presto’s straightforward commands, we can effortlessly write and implement the intricate sequences required for our bosonic code research.

Q: You mentioned that Presto replaces multiple pieces of equipment. What specific capabilities does the instrument handle for you?
A: Presto’s ability to control the entire quantum experiment using a single instrument really sets it apart from the competition. It allows us to seamlessly conduct both pulsed and continuous signal experiments. Additionally, it provides:
*Fast and static DC-bias for flux control.
*High-frequency pump signals for parametric amplifiers.

Q: How has your experience been working with the IMP team when you needed assistance?
A: Throughout our journey, the support from IMP has been exceptional. The team is highly responsive and addresses our queries promptly. Their expertise has been invaluable, and frankly, we couldn't be happier that we chose IMP.

Q: In summary, what impact has Presto had on your lab?
A: It has become an indispensable asset. The combination of template memory, the Python API, and comprehensive system control has significantly elevated our capabilities. With Presto, we are eager to push the boundaries of quantum information processing.

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