Quantum control theory for coupled 2-electron dynamics in quantum dots

Abstract

We investigate optimal control strategies for state to state transitions in a model of a quantum dot molecule containing two active strongly interacting electrons. The Schrodinger equation is solved nonperturbatively in conjunction with several quantum control strategies. This results in optimized electric pulses in the THz regime which can populate combinations of states with very short transition times. The speedup compared to intuitively constructed pulses is an order of magnitude. We furthermore make use of optimized pulse control in the simulation of an experimental preparation of the molecular quantum dot system. It is shown that exclusive population of certain excited states leads to a complete suppression of spin dephasing, as was indicated in Nepstad et al. [Phys. Rev. B 77, 125315 (2008)].

24 pages, 9 figures

References in corpus (7)

• Relaxation, dephasing, and quantum control of electron spins in double quantum dots
• Singlet-triplet decoherence due to nuclear spins in a double quantum dot
• Dynamic Nuclear Polarization with Single Electron Spins
• Optimal Control of Quantum Rings by Terahertz Laser Pulses
• Rabi oscillations and excitation trapping in the coherent excitation of a mesoscopic frozen Rydberg gas
• Effect of Exchange Interaction on Spin Dephasing in a Double Quantum Dot
• Coherent adiabatic theory of two-electron quantum dot molecules in external spin baths

Cited by in corpus (4)

• Ultrafast sequential charge transfer in a double quantum dot
• Telegraph noise effects on two charge-qubits in double quantum dots
• Optical Control of Entangled States in Quantum Wells
• Fundamental Gates for a Strongly Correlated Two-Electron Quantum Ring