Coupling and Entangling of Quantum States in Quantum Dot Molecules

We demonstrate coupling and entangling of quantum states in a pair of vertically aligned, self-assembled quantum dots by studying the emission of an interacting electron-hole pair (exciton) in a single dot molecule as a function of the separation between the dots. An interaction-induced energy split...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2001-01, Vol.291 (5503), p.451-453
Main Authors: Bayer, M., Hawrylak, P., Hinzer, K., Fafard, S., Korkusinski, M., Wasilewski, Z. R., Stern, O., Forchel, A.
Format: Article
Language:English
Subjects:
Colloids
Computer engineering
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electric fields
Electron states and collective excitations in thin films, multilayers, quantum wells, mesoscopic and nanoscale systems
Electron tunneling
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electrons
Emission spectra
Engineering
Exact sciences and technology
Excitons
Information Processing
Information storage and retrieval systems
Molecules
Optical data processing
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optical properties of specific thin films
Particle interactions
Physics
Quantum dots
Quantum electronics
Quantum entanglement
Quantum theory
Quantum tunneling
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Summary:We demonstrate coupling and entangling of quantum states in a pair of vertically aligned, self-assembled quantum dots by studying the emission of an interacting electron-hole pair (exciton) in a single dot molecule as a function of the separation between the dots. An interaction-induced energy splitting of the exciton is observed that exceeds 30 millielectron volts for a dot layer separation of 4 nanometers. The results are interpreted by mapping the tunneling of a particle in a double dot to the problem of a single spin. The electron-hole complex is shown to be equivalent to entangled states of two interacting spins.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.291.5503.451