Now showing items 1-10 of 27
Enhancement of quantum speed limit time due to cooperative effects in multilevel systems
(IOP Publishing, 2015-08)
Deriving minimum evolution times is of paramount importance in quantum mechanics. Bounds on the speed of evolution are given by the so called quantum speed limit (QSL). In this work we use quantum optimal control methods ...
Quantum-speed-limit bounds in an open quantum evolution
(American Physical Society, 2016-11)
ABSTRACTQuantum mechanics dictates bounds for the minimal evolution time between predetermined initial and final states. Several of these quantum-speed-limit (QSL) bounds were derived for nonunitary dynamics using different ...
Controlling open quantum systems using fast transitions
(American Physical Society, 2013-02-13)
Unitary control and decoherence appear to be irreconcilable in quantum mechanics. When a quantum system interacts with an environment, control strategies usually fail due to decoherence. In this article we implement a ...
Time-optimal control fields for quantum systems with multiple avoided crossings
(American Physical Society, 2015-10)
We study time-optimal protocols for controlling quantum systems which show several avoided level crossings in their energy spectrum. The structure of the spectrum allows us to generate a robust guess which is time-optimal ...
Maximum population transfer in a periodically driven quantum system
(American Physical Society, 2014-12)
We study the dynamics of a two-level quantum system under the influence of sinusoidal driving in the intermediate-frequency regime. Analyzing the Floquet quasienergy spectrum, we find combinations of the field parameters ...
Entanglement and the speed of evolution of two interacting qubits
(IOP Publishing, 2013-02)
The time needed by a quantum system to reach a state fully distinguishable from the original one provides a natural way of determining how fast the corresponding dynamical evolution is. This orthogonality time admits a ...
Quantum speed limit and optimal evolution time in a two-level system
(IOP Publishing, 2013-12-16)
Quantum mechanics establishes a fundamental bound for the minimum evolution time between two states of a given system. Known as the quantum speed limit (QSL), it is a useful tool in the context of quantum control, where ...
Controlled high-fidelity navigation in the charge stability diagram of a double quantum dot
(Iop Publishing, 2015-03)
We propose an efficient control protocol for charge transfer in a double quantum dot. We consider numerically a two-dimensional model system, where the quantum dots are subjected to time-dependent electric fields ...
Optimal control of hybrid qubits: Implementing the quantum permutation algorithm
The optimal quantum control theory is employed to determine electric pulses capable of producing quantum gates with a fidelity higher than 0.9997, when noise is not taken into account. Particularly, these quantum gates ...
ABOUT ZITTERBEWEGUNG AND ELECTRON-STRUCTURE
(Elsevier Science BvAmsterdamHolanda, 1993)