Ultrafast sequential charge transfer in a double quantum dot

Abstract

We use optimal control theory to construct external electric fields which coherently transfer the electronic charge in a double quantum-dot system. Without truncation of the eigenstates we operate on desired superpositions of the states in order to prepare the system to a localized state and to coherently transfer the charge from one well to another. Within a fixed time interval, the optimal processes are shown to occur through several excited states. The obtained yields are generally between 99% and 99.99% depending on the field constraints, and they are not dramatically affected by strict frequency filters which make the fields (e.g., laser pulses) closer to experimental realism. Finally we demonstrate that our scheme provides simple access to hundreds of sequential processes in charge localization while preserving the high fidelity.

submitted to Phys. Rev. B

References in corpus (7)

• Optimal Control of Quantum Rings by Terahertz Laser Pulses
• Controlling Spin Qubits in Quantum Dots
• Tailoring laser pulses with spectral and fluence constraints using optimal control theory
• Optimal laser-control of double quantum dots
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Cited by in corpus (6)

• Controlled quantum state transfer in $XX$ spin chains at the Quantum Speed Limit
• Quenched dynamics of entangled states in correlated quantum dots
• Optical Control of Entangled States in Quantum Wells
• Optimal control of quantum revival
• Time evolution of an entangled initial state in coupled quantum dots with Coulomb correlations
• Fast optical control of a coded qubit in a triple quantum dot