Optimal Control of Quantum Rings by Terahertz Laser Pulses

Abstract

Complete control of single-electron states in a two-dimensional semiconductor quantum-ring model is established, opening a path into coherent laser-driven single-gate qubits. The control scheme is developed in the framework of optimal control theory for laser pulses of two-component polarization. In terms of pulse lengths and target-state occupations, the scheme is shown to be superior to conventional control methods that exploit Rabi oscillations generated by uniform circularly polarized pulses. Current-carrying states in a quantum ring can be used to manipulate a two-level subsystem at the ring center. Combining our results, we propose a realistic approach to construct a laser-driven single-gate qubit that has switching times in the terahertz regime.

Phys. Rev. Lett. (in print) (2007)

References in corpus (2)

• Laser-controlled local magnetic field with semiconductor quantum rings
• Controlling Spin Qubits in Quantum Dots

Cited by in corpus (16)

• A time-dependent approach to electron pumping in open quantum systems
• Periodic array of quantum rings strongly coupled to circularly polarized light as a topological insulator
• Optimal laser-control of double quantum dots
• Semiconductor quantum ring as a solid-state spin qubit
• Quantum interference and the time-dependent radiation of nanojunctions
• Down-conversion processes in ab-initio non-relativistic quantum electrodynamics
• Nonequilibrium charge dynamics of light-driven rings threaded by a magnetic flux
• Polarized light bursts from kicked quantum rings
• Coherent adiabatic theory of two-electron quantum dot molecules in external spin baths
• Controlled Operations in a Strongly Correlated Two-Electron Quantum Ring
• Optimal control of quantum revival
• Spin and tunneling dynamics in an asymmetrical double quantum dot with spin - orbit coupling
• Quantum-information theory of a Dirichlet ring with Aharonov-Bohm field
• Dynamical Jahn-Teller effects on the generation of electronic ring currents by circularly polarized light
• The relevance of degenerate states in chiral polaritonics
• Exact solutions for the time-evolution of quantum spin systems under arbitrary waveforms using algebraic graph theory