Size-dependent decoherence of excitonic states in semiconductor microcrystallites

Abstract

The size-dependent decoherence of the exciton states resulting from the spontaneous emission is investigated in a semiconductor spherical microcrystallite under condition $a_B\ll R_0\le \lambda$. In general, the larger size of the microcrystallite corresponds to the shorter coherence time. If the initial state is a superposition of two different excitonic coherent states, the coherence time depends on both the overlap of two excitonic coherent states and the size of the microcrystallite. When the system with fixed size is initially in the even or odd coherent states, the larger average number of the excitons corresponds to the faster decoherence. When the average number of the excitons is given, the bigger size of the microcrystallite corresponds to the faster decoherence. The decoherence of the exciton states for the materials GaAs and CdS is numerically studied by our theoretical analysis.

4 pages, two figures

References in corpus (15)

• Quantum Computation with Quantum Dots
• Conditional Quantum Dynamics and Logic Gates
• Quantum-Information Processing with Semiconductor Macroatoms
• Macroscopically distinct quantum superposition states as a bosonic code for amplitude damping
• Allowed and forbidden transitions in artificial hydrogen and helium atoms
• Entangled Bell and GHZ states of excitons in coupled quantum dots
• Quantum Information in Semiconductors: Noiseless Encoding in a Quantum-Dot Array
• Electro-optical properties of semiconductor quantum dots: Application to quantum information processing
• Quantum entanglement and information processing via excitons in optically-driven quantum dots
• Spin-based quantum computation in multielectron quantum dots
• Generation of maximum spin entanglement induced by cavity field in quantum-dot systems
• Dynamics of entanglement for coherent excitonic states in a system of two coupled quantum dots and cavity QED
• Realization of symmetric sharing of entanglement in semiconductor microcrystallites coupled by a cavity field
• Quantum decoherence of excitons in a leaky cavity with quasimode
• Decoherence effects on the generation of exciton entangled states in coupled quantum dots

Cited by in corpus (3)

• On the generation of multipartite entangled states in Josephson architectures
• Exciton entanglement in two coupled semiconductor microcrystallites
• Quantum Entanglement and Teleportation of Quantum-Dot States in Microcavities