Robust states in semiconductor quantum dot molecules

Abstract

Semiconductor quantum dots coherently driven by pulsed laser are fundamental physical systems which allow studying the dynamical properties of confined quantum states. These systems are attractive candidates for a solid-state qubit, which open the possibility for several investigations in quantum information processing. In this work we study the effects of a specific decoherence process, the spontaneous emission of excitonic states, in a quantum dot molecule. We model our system considering a three-level Hamiltonian and solve the corresponding master equation in the Lindblad form. Our results show that the spontaneous emission associated with the direct exciton helps to build up a robust indirect exciton state. This robustness against decoherence allows potential applications in quantum memories and quantum gate architectures. We further investigate several regimes of physical parameters, showing that this process is easily controlled by tuning of external fields.

To appear in Physical Review B

References in corpus (13)

• The Physical Implementation of Quantum Computation
• Direct Observation of Controlled Coupling in an Individual Quantum Dot Molecule
• Coherent control of tunneling in a quantum dot molecule
• Spin-based all-optical quantum computation with quantum dots: understanding and suppressing decoherence
• Control of Spin Dynamics of Excitons in Nanodots for Quantum Operations
• Engineering electron and hole tunneling with asymmetric InAs quantum dot molecules
• Decoherence of Rabi oscillations in a single quantum dot
• Decoherence processes during active manipulation of excitonic qubits in semiconductor quantum dots
• Recent advances in exciton based quantum information processing in quantum dot nanostructures
• Exciton lifetime in InAs/GaAs quantum dot molecules
• Molecular phases in coupled quantum dots
• Optically-controlled logic gates for two spin qubits in vertically-coupled quantum dots
• Decoherence in a driven three-level system

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• Using quantum state protection via dissipation in a quantum-dot molecule to solve the Deutsch problem
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• Phonon-assisted tunnelling in a double quantum dot molecule immersed in a cavity
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• Photovoltaic efficiency at maximum power of a quantum dot molecule
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• Light emission properties in a double quantum dot molecule immersed in a cavity: phonon-assisted tunneling
• Tunneling induced transparency and controllable group velocity in triple and multiple quantum-dot molecules