116 citations · 313 across the 12 of their papers we have counts for
11 papers · 1 filter
Quantum Optimal Control of Squeezing in Cavity Optomechanics
Anton Halaski, Matthias G. Krauss, Daniel Basilewitsch +1
Squeezing is a non-classical feature of quantum states that is a useful resource, for example in quantum sensing of mechanical forces. Here, we show how to use optimal control theo…
Chaotic fluctuations in a universal set of transmon qubit gates
Daniel Basilewitsch, Simon-Dominik Börner, Christoph Berke +3
Transmon qubits arise from the quantization of nonlinear resonators, systems that are prone to the buildup of strong, possibly chaotic, fluctuations. Such instabilities will likely…
Engineering Strong Beamsplitter Interaction between Bosonic Modes via Quantum Optimal Control Theory
Daniel Basilewitsch, Yaxing Zhang, S. M. Girvin +1
In continuous-variable quantum computing with qubits encoded in the infinite-dimensional Hilbert space of bosonic modes, it is a difficult task to realize strong and on-demand inte…
Optimally controlled quantum discrimination and estimation
Daniel Basilewitsch, Haidong Yuan, Christiane P. Koch
Quantum discrimination and estimation are pivotal for many quantum technologies, and their performance depends on the optimal choice of probe state and measurement. Here we show th…
Fundamental Bounds on Qubit Reset
Daniel Basilewitsch, Jonas Fischer, Daniel M. Reich +2
Qubit reset is a basic prerequisite for operating quantum devices, requiring the export of entropy. The fastest and most accurate way to reset a qubit is obtained by coupling the q…
Reservoir Engineering using Quantum Optimal Control for Qubit Reset
Daniel Basilewitsch, Francesco Cosco, Nicola Lo Gullo +4
We determine how to optimally reset a superconducting qubit which interacts with a thermal environment in such a way that the coupling strength is tunable. Describing the system in…
Krotov: A Python implementation of Krotov's method for quantum optimal control
Michael H. Goerz, Daniel Basilewitsch, Fernando Gago-Encinas +4
We present a new open-source Python package, krotov, implementing the quantum optimal control method of that name. It allows to determine time-dependent external fields for a wide…
Time-optimal purification of a qubit in contact with a structured environment
Jonas Fischer, Daniel Basilewitsch, Christiane P. Koch +1
We investigate the time-optimal control of the purification of a qubit interacting with a structured environment, consisting of a strongly coupled two-level defect in interaction w…
Quantum Optimal Control for Mixed State Squeezing in Cavity Optomechanics
Daniel Basilewitsch, Christiane P. Koch, Daniel M. Reich
The performance of key tasks in quantum technology, such as accurate state preparation, can be maximized by utilizing external controls and deriving their shape with optimal contro…
Dissipative Quantum Dynamics and Optimal Control using Iterative Time Ordering: An Application to Superconducting Qubits
Daniel Basilewitsch, Lutz Marder, Christiane P. Koch
We combine a quantum dynamical propagator that explicitly accounts for quantum mechanical time ordering with optimal control theory. After analyzing its performance with a simple m…
Beating the limits with initial correlations
Daniel Basilewitsch, Rebecca Schmidt, Dominique Sugny +2
Fast and reliable reset of a qubit is a key prerequisite for any quantum technology. For real world open quantum systems undergoing non-Markovian dynamics, reset implies not only p…