Quantum optimal control in quantum technologies. Strategic report on current status, visions and goals for research in Europe
Christiane P. Koch,Ugo Boscain,Tommaso Calarco,Gunther Dirr,Stefan Filipp,Steffen J. Glaser,Ronnie Kosloff,Simone Montangero,Thomas Schulte-Herbrüggen,Dominique Sugny,Frank K. Wilhelm +10 more
TLDR
In this article , the authors review recent progress in understanding of the controllability of open quantum systems and in the development and application of quantum control techniques to quantum technologies, and sketch a roadmap for future developments.Abstract:
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 possible, has evolved into one of the cornerstones for enabling quantum technologies. The last few years have seen a rapid evolution and expansion of the field. We review here recent progress in our understanding of the controllability of open quantum systems and in the development and application of quantum control techniques to quantum technologies. We also address key challenges and sketch a roadmap for future developments. read more
Citations
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Quantum Optimal Control via Semi-Automatic Differentiation
TL;DR: The use of semi-automatic differentiation for the optimization of perfectly entangling quantum gates on superconducting qubits coupled via a shared transmission line includes the first direct optimization of the non-analytic gate concurrence.
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Quocs: The Quantum Optimal Control Suite
Marco Rossignolo,Thomas Reisser,Alastair Marshall,Phila Rembold,Alice Pagano,Philipp J. Vetter,Ressa S. Said,Matthias M. Müller,Felix Motzoi,Tommaso Calarco,Fedor Jelezko,Simone Montangero +11 more
TL;DR: The Quantum Optimal Control Suite (QuOCS) as discussed by the authors unifies experimental focus and model-based approaches in a unified framework to improve the performance of many quantum technology platforms, such as color defects in diamond, superconducting qubits, atom-based quantum computers.
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Energy control in a quantum oscillator using coherent control and engineered environment
TL;DR: In this article , a robustified speed-gradient control algorithm in differential form is proposed to ensure exponential stability of the closed-loop system which is preserved for sampled-data control.
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Optimal control for state preparation in two-qubit open quantum systems driven by coherent and incoherent controls via GRAPE approach
TL;DR: In this paper , a model of two qubits driven by coherent and incoherent time-dependent controls is considered and the optimal control problem of state preparation is formulated as minimization of the Hilbert-Schmidt distance between the final density matrix and a given target density matrix at some fixed target time.
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Optimal control in disordered quantum systems
TL;DR: In this paper , the authors investigate several control strategies for the transport of an excitation along a spin chain and demonstrate that fast high-fidelity transport can be achieved using protocols designed with differentiable programming.
References
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Human-level control through deep reinforcement learning
Volodymyr Mnih,Koray Kavukcuoglu,David Silver,Andrei Rusu,Joel Veness,Marc G. Bellemare,Alex Graves,Martin Riedmiller,Andreas K. Fidjeland,Georg Ostrovski,Stig Petersen,Charles Beattie,Amir Sadik,Ioannis Antonoglou,Helen King,Dharshan Kumaran,Daan Wierstra,Shane Legg,Demis Hassabis +18 more
TL;DR: This work bridges the divide between high-dimensional sensory inputs and actions, resulting in the first artificial agent that is capable of learning to excel at a diverse array of challenging tasks.
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On the Generators of Quantum Dynamical Semigroups
TL;DR: In this paper, the notion of a quantum dynamical semigroup is defined using the concept of a completely positive map and an explicit form of a bounded generator of such a semigroup onB(ℋ) is derived.
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Cavity Optomechanics
TL;DR: The field of cavity optomechanics explores the interaction between electromagnetic radiation and nano-or micromechanical motion as mentioned in this paper, which explores the interactions between optical cavities and mechanical resonators.
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Quantum Computing in the NISQ era and beyond
TL;DR: Noisy Intermediate-Scale Quantum (NISQ) technology will be available in the near future as mentioned in this paper, which will be useful tools for exploring many-body quantum physics, and may have other useful applications.