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Quantum Electronics and Laser Science Conference

Exotic states of excitons in quantum dots

Adriano Barenco, M.‐A. Dupertuis

Published May 2, 1993• 0 citations
OpenAlex

Abstract

Many quantum states of light and matter, such as coherent states, squeezed states, minimum-uncertainty states, intelligent states, quasi-intelligent states, and symmetric states, have long been of academic interest.1 However, because of the success in realizing and using light squeezing in feasibility experiments, attention is now turning to the realization of more practical light sources. In this paper we adopt a new constructive procedure to look for new states of matter that may eventually permit the generation of squeezed light from new types of advanced semiconductor light sources.

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Many quantum states of light and matter, such as coherent states, squeezed states, minimum-uncertainty states, intelligent states, quasi-intelligent states, and symmetric states, have long been of academic interest.1 However, because of the success in realizing and using light squeezing in feasibility experiments, attention is now turning to the realization of more practical light sources. In this paper we adopt a new constructive procedure to look for new states of matter that may eventually permit the generation of squeezed light from new types of advanced semiconductor light sources.
Multiatom quasi-intelligent and squeezed states with more than two atoms are constructed. A new general criterion for the squeezing of quasi-intelligent states and a method adapted to find maximally squeezed states are proposed. Multiatom quasi-intelligent states related to the collective dipole moment of an arbitrary number of non-identical two-level atoms are constructed. Squeezed states of the system of identical two-level atoms are investigated on the basis of symmetric multiatom states. The authors show in particular that there are no stationary squeezed states for which the expectation value of the collective dipole rising and lowering operators vanish for an odd number of atoms, whilst arbitrary large squeezing is realisable with an even number of atoms. A constructive procedure to generate squeezed light from the ground state by a squeezed multiatom system is proposed. These properties do not depend on whether the multiatom system consists of identical or non-identical atoms.
The quest for a global quantum internet is based on the realization of a scalable network which requires quantum hardware with exceptional performance. Among them are quantum light sources providing deterministic, high brightness, high-fidelity entangled photons and quantum memories with coherence times in the millisecond range and above. To operate the network on a global scale, the quantum light source should emit at telecommunication wavelengths with minimum propagation losses. A cornerstone for the operation of such a quantum network is the demonstration of quantum teleportation. Here we realize full-photonic quantum teleportation employing one of the most promising platforms, i.e. semiconductor quantum dots, which can fulfill all the aforementioned requirements. Two remote quantum dots are used, one as a source of entangled photon pairs and the other as a single-photon source. The frequency mismatch between the triggered sources is erased using two polarization-preserving quantum frequency converters, enabling a Bell state measurement at telecommunication wavelengths. A post-selected teleportation fidelity of up to 0.721(33) is achieved, significantly above the classical limit, demonstrating successful quantum teleportation between light generated by distinct sources. These results mark a major advance for the semiconductor platform as a source of quantum light fulfilling a key requirement for a scalable quantum network. This becomes particularly relevant after the seminal breakthrough of addressing a nuclear spin in semiconductor quantum dots demonstrating long coherence times, thus fulfilling another crucial step towards a scalable quantum network.
We report on coherent resonant emission of the fundamental exciton state in a single semiconductor GaAs quantum dot. A resonant regime with picosecond laser excitation is realized by embedding the quantum dots in a one-dimensional waveguiding structure. As the pulse intensity is increased, Rabi oscillation is observed up to three periods. The Rabi regime is achieved owing to an enhanced light-matter coupling in the waveguide but with different dynamics with respect to usual cavity quantum electrodynamics. The resonant control of the quantum dot fundamental transition opens new possibilities in quantum state manipulation and quantum optics experiments in condensed-matter physics.