Optically Driven Qubits in Artificial Molecules

Abstract

We present novel models of quantum gates based on coupled quantum dots in which a qubit is regarded as the superposition of ground states in each dot. Coherent control on the qubit is performed by both a frequency and a polarization of a monochromatic light pulse illuminated on the quantum dots. We also show that a simple combination of two single qubit gates functions as a controlled NOT gate resulting from an electron-electron interaction. To examine the decoherence of quantum states, we discuss electronic relaxation contributed mainly by LA phonon processes.

11 pages, 4 figures, submitted to Physical Review A

References in corpus (3)

• Coherent control of macroscopic quantum states in a single-Cooper-pair box
• Resonant electron transfer between quantum dots
• Time-convolutionless reduced-density-operator theory of a noisy quantum channel: a two-bit quantum gate for quantum information processing

Cited by in corpus (9)

• Self-consistent non-Markovian theory of a quantum state evolution for quantum information processing
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• Entanglement and quantum state engineering in the optically driven two-electron double-dot structure
• Exciton entanglement in two coupled semiconductor microcrystallites
• Auxiliary-level-assisted operations with charge qubits in semiconductors
• Phonon-induced decoherence of the two-level quantum subsystem due to relaxation and dephasing processes
• Laser-induced operations with charge qubits in a double-well nanostructure
• Charge qubit entanglement via conditional single-electron transfer in an array of quantum dots
• Electrical control of superposed quantum states evolution in quantum dot molecule by pulsed field