Optimizing performance of quantum operations with non-Markovian decoherence : the tortoise or the hare?
Abstract
The interaction between a quantum system and its environment limits our ability to control it and perform quantum operations on it. We present an efficient method to find optimal controls for quantum systems coupled to non-Markovian environments, by using the process tensor to compute the gradient of an objective function. We consider state transfer for a driven two-level system coupled to a bosonic environment, and characterize performance in terms of speed and fidelity. We thus determine the best achievable fidelity as a function of process duration. We show there is a trade-off between speed and fidelity, and that slower processes can have higher fidelity by exploiting non-Markovian effects.
Citation
Butler , E P , Fux , G E , Ortega-Taberner , C , Lovett , B W , Keeling , J & Eastham , P R 2024 , ' Optimizing performance of quantum operations with non-Markovian decoherence : the tortoise or the hare? ' , Physical Review Letters , vol. 132 , no. 6 , 060401 . https://doi.org/10.1103/PhysRevLett.132.060401
Publication
Physical Review Letters
Status
Peer reviewed
ISSN
0031-9007Type
Journal article
Description
Funding: E. P. B. acknowledges support from the Irish Research Council (GOIPG/2019/1871). G. E. F. acknowledges support from EPSRC (EP/L015110/1). B.W. L. and J. K. acknowledge support from EPSRC (EP/T014032/1). P. R. E. acknowledges support from Science Foundation Ireland (21/FFP-P/10142).Collections
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