Entanglement of two, three, or four plasmonically coupled quantum dots
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Otten, Matthew, Raman A. Shah, Norbert F. Scherer, Misun Min, Matthew Pelton, and Stephen K. Gray. “Entanglement of Two, Three, or Four Plasmonically Coupled Quantum Dots.” Physical Review B 92, no. 12 (September 23, 2015): 125432. https://doi.org/10.1103/PhysRevB.92.125432.
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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract
We model the quantum dynamics of two, three, or four quantum dots (QDs) in proximity to a plasmonic system such as a metal nanoparticle or an array of metal nanoparticles. For all systems, an initial state with only one QD in its excited state evolves spontaneously into a state with entanglement between all pairs of QDs. The entanglement arises from the couplings of the QDs to the dissipative, plasmonic environment. Moreover, we predict that similarly entangled states can be generated in systems with appropriate geometries, starting in their ground states, by exciting the entire system with a single, ultrafast laser pulse. By using a series of repeated pulses, the system can also be prepared in an entangled state at an arbitrary time.