Quantum optimal control in quantum technologies. Strategic report on current status, visions and goals for research in Europe

CP Koch, U Boscain, T Calarco, G Dirr… - EPJ Quantum …, 2022 - epjqt.epj.org
Quantum optimal control, a toolbox for devising and implementing the shapes of external
fields that accomplish given tasks in the operation of a quantum device in the best way …

Introduction to the Pontryagin maximum principle for quantum optimal control

U Boscain, M Sigalotti, D Sugny - PRX Quantum, 2021 - APS
Optimal control theory is a powerful mathematical tool, which has known a rapid
development since the 1950s, mainly for engineering applications. More recently, it has …

Differentiable quantum architecture search

SX Zhang, CY Hsieh, S Zhang… - Quantum Science and …, 2022 - iopscience.iop.org
Quantum architecture search (QAS) is the process of automating architecture engineering of
quantum circuits. It has been desired to construct a powerful and general QAS platform …

From pulses to circuits and back again: A quantum optimal control perspective on variational quantum algorithms

AB Magann, C Arenz, MD Grace, TS Ho, RL Kosut… - PRX Quantum, 2021 - APS
The last decade has witnessed remarkable progress in the development of quantum
technologies. Although fault-tolerant devices likely remain years away, the noisy …

Optimal protocols in quantum annealing and quantum approximate optimization algorithm problems

LT Brady, CL Baldwin, A Bapat, Y Kharkov… - Physical Review Letters, 2021 - APS
Quantum annealing (QA) and the quantum approximate optimization algorithm (QAOA) are
two special cases of the following control problem: apply a combination of two Hamiltonians …

[HTML][HTML] Time-optimal two-and three-qubit gates for Rydberg atoms

S Jandura, G Pupillo - Quantum, 2022 - quantum-journal.org
We identify time-optimal laser pulses to implement the controlled-Z gate and its three qubit
generalization, the C $ _2 $ Z gate, for Rydberg atoms in the blockade regime. Pulses are …

Optimal control for quantum optimization of closed and open systems

LC Venuti, D D'Alessandro, DA Lidar - Physical Review Applied, 2021 - APS
Optimization is one of the key applications of quantum computing where a quantum
speedup has been an eagerly anticipated outcome. A promising approach to optimization …

[HTML][HTML] Binary control pulse optimization for quantum systems

X Fei, LT Brady, J Larson, S Leyffer, S Shen - Quantum, 2023 - quantum-journal.org
Quantum control aims to manipulate quantum systems toward specific quantum states or
desired operations. Designing highly accurate and effective control steps is vitally important …

Behavior of analog quantum algorithms

LT Brady, L Kocia, P Bienias, A Bapat… - arXiv preprint arXiv …, 2021 - arxiv.org
Analog quantum algorithms are formulated in terms of Hamiltonians rather than unitary
gates and include quantum adiabatic computing, quantum annealing, and the quantum …

Leakage reduces device coherence demands for pulse-level molecular simulations

A Asthana, C Liu, OR Meitei, SE Economou… - Physical Review …, 2023 - APS
Quantum simulation on noisy intermediate-scale quantum devices is severely limited by
short qubit coherence times. A variational pulse-shaping algorithm known as ctrl-VQE was …