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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 17:44 |
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Conference: Bucharest University Faculty of Physics 2014 Meeting
Section: Polymer Physics
Title:
Entangled Photon Pair Generation in Semiconductor Quantum Dots
Authors:
T.O. CHECHE
Affiliation:
Faculty of Physics, University of Bucharest
E-mail
tiberiuscheche@yahoo.com
Keywords:
quantum dot, entangled photons
Abstract:
Use of semiconductor quantum dots as a source of entangled photons is a popular proposal to obtain entangled quantum states. The idea underlining the principle of entangled photon emission with quantum dots relies on fundamental quantum physics: particle indistinguishability generates a superposition state when two energetically nearly degenerate quantum levels are populated at the same time. Starting from the biexcitonic ground state of the quantum dot, a first electron can recombine with a hole and emit a sigma- or a sigma+ polarized photon. Then, the second electron of opposite spin (according to Pauli's principle) recombines with a hole, and a photon of opposite polarization is emitted. In this case, the so called "which path" information is erased and the two-photon state is a maximally entangled (Bell) state. The conditions necessary to generate two polarized-entangled photons in a biexciton-exciton cascade recombination are established in this work. Coating with the appropriate material is the usual way to ensure the necessary chemical stability of the nanostructures. The presence of shells in nanostructures makes the modeling more complicated, but solving this problem is mandatory to have an accurate prediction on use of quantum dots as possible photon entanglement devices. Extension of the nanostructure multiexciton Hamiltonian to hybrid superconductor QD devices is introduced.
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