Self-verifying variational quantum simulation of lattice models

C Kokail, C Maier, R van Bijnen, T Brydges, MK Joshi… - Nature, 2019 - nature.com
Hybrid classical–quantum algorithms aim to variationally solve optimization problems using
a feedback loop between a classical computer and a quantum co-processor, while …

Fast machine-learning online optimization of ultra-cold-atom experiments

PB Wigley, PJ Everitt, A van den Hengel, JW Bastian… - Scientific reports, 2016 - nature.com
We apply an online optimization process based on machine learning to the production of
Bose-Einstein condensates (BEC). BEC is typically created with an exponential evaporation …

Optimizing variational quantum algorithms using pontryagin's minimum principle

ZC Yang, A Rahmani, A Shabani, H Neven, C Chamon - Physical Review X, 2017 - APS
We use Pontryagin's minimum principle to optimize variational quantum algorithms. We
show that for a fixed computation time, the optimal evolution has a bang-bang (square …

Applying machine learning optimization methods to the production of a quantum gas

AJ Barker, H Style, K Luksch, S Sunami… - Machine Learning …, 2020 - iopscience.iop.org
We apply three machine learning strategies to optimize the atomic cooling processes
utilized in the production of a Bose–Einstein condensate (BEC). For the first time, we …

Remote optimization of an ultracold atoms experiment by experts and citizen scientists

R Heck, O Vuculescu, JJ Sørensen… - Proceedings of the …, 2018 - National Acad Sciences
We introduce a remote interface to control and optimize the experimental production of Bose–
Einstein condensates (BECs) and find improved solutions using two distinct …

Experimental demonstration of shaken-lattice interferometry

CA Weidner, DZ Anderson - Physical Review Letters, 2018 - APS
We experimentally demonstrate a shaken-lattice interferometer. Atoms are trapped in the
ground Bloch state of a red-detuned optical lattice. Using a closed-loop optimization protocol …

Approaching the adiabatic timescale with machine learning

BM Henson, DK Shin, KF Thomas… - Proceedings of the …, 2018 - National Acad Sciences
The control and manipulation of quantum systems without excitation are challenging, due to
the complexities in fully modeling such systems accurately and the difficulties in controlling …

Non-equilibrium scale invariance and shortcuts to adiabaticity in a one-dimensional Bose gas

W Rohringer, D Fischer, F Steiner, IE Mazets… - Scientific reports, 2015 - nature.com
We present experimental evidence for scale invariant behaviour of the excitation spectrum in
phase-fluctuating quasi-1d Bose gases after a rapid change of the external trap** …

Vibrational state inversion of a Bose–Einstein condensate: optimal control and state tomography

R Bücker, T Berrada, S Van Frank… - Journal of Physics B …, 2013 - iopscience.iop.org
We present theoretical and experimental results on high-fidelity transfer of a trapped Bose–
Einstein condensate into its first vibrationally excited eigenstate. The excitation is driven by …

Optimal control of superconducting gmon qubits using Pontryagin's minimum principle: Preparing a maximally entangled state with singular bang-bang protocols

S Bao, S Kleer, R Wang, A Rahmani - Physical Review A, 2018 - APS
We apply the theory of optimal control to the dynamics of two “gmon” qubits, with the goal of
preparing a desired entangled ground state from an initial unentangled one. Given an initial …