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  Gradient Ascent Pulse Engineering with Feedback

Porotti, R., Peano, V., & Marquardt, F. (2023). Gradient Ascent Pulse Engineering with Feedback. PRX Quantum, 4: 030305. doi:10.1103/PRXQuantum.4.030305.

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 Creators:
Porotti, Riccardo1, 2, Author
Peano, Vittorio1, Author           
Marquardt, Florian1, 2, Author           
Affiliations:
1Marquardt Division, Max Planck Institute for the Science of Light, Max Planck Society, ou_2421700              
2Department of Physics, Friedrich-Alexander Universität Erlangen-Nürnberg, ou_persistent22              

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 Abstract: Efficient approaches to quantum control and feedback are essential for quantum technologies, from sensing to quantum computation. Open-loop control tasks have been successfully solved using optimization techniques, including methods such as gradient-ascent pulse engineering (GRAPE) , relying on a differentiable model of the quantum dynamics. For feedback tasks, such methods are not directly applicable, since the aim is to discover strategies conditioned on measurement outcomes. In this work, we introduce feedback GRAPE, which borrows some concepts from model-free reinforcement learning to incorporate the response to strong stochastic (discrete or continuous) measurements, while still performing direct gradient ascent through the quantum dynamics. We illustrate its power considering various scenarios based on cavity-QED setups. Our method yields interpretable feedback strategies for state preparation and stabilization in the presence of noise. Our approach could be employed for discovering strategies in a wide range of feedback tasks, from calibration of multiqubit devices to linear-optics quantum computation strategies, quantum enhanced sensing with adaptive measurements, and quantum error correction.

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Language(s): eng - English
 Dates: 2023-07-13
 Publication Status: Published online
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 Identifiers: DOI: 10.1103/PRXQuantum.4.030305
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Title: PRX Quantum
Source Genre: Journal
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Publ. Info: APS
Pages: - Volume / Issue: 4 Sequence Number: 030305 Start / End Page: - Identifier: Other: 2691-3399 (online only)
CoNE: https://pure.mpg.de/cone/journals/resource/journals/resource/2691-3399