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Temperature Characterization of a Rubidium Vapor Electromagnetically Induced Transparency Quantum Memory

Konrad Artur Socha

Published Jan 1, 2025• 0 citations
Publisher

Abstract

Quantum communications aims to bring the quantum advantages to a large network. However, distributing quantum capabilities is a complicated task with many challenges. Electromagnetically induced transparency(EIT) based quantum storage is a candidate for implementation of quantum repeaters for the purpose of overcoming distance limitations in quantum communications. In this thesis we analyze the use of warm rubidium (Rb) vapor as a medium for a quantum memory. Starting by combining the Hamiltonian of a 2 level system with Maxwells equations we will model the interactions between light and the atomic system. We then examine simulations of the system and characterization of key features such as susceptibility and absorption. We are able to compare simulated spectroscopy models with spectroscopy data obtained from experiment to characterize the temperature of a rubidium vapor cell. These findings contribute to the ongoing development of quantum memory systems for efficient quantum repeaters.

DOI
10.22215/etd/2025-16535

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Quantum communications aims to bring the quantum advantages to a large network. However, distributing quantum capabilities is a complicated task with many challenges. Electromagnetically induced transparency(EIT) based quantum storage is a candidate for implementation of quantum repeaters for the purpose of overcoming distance limitations in quantum communications. In this thesis we analyze the use of warm rubidium (Rb) vapor as a medium for a quantum memory. Starting by combining the Hamiltonian of a 2 level system with Maxwells equations we will model the interactions between light and the atomic system. We then examine simulations of the system and characterization of key features such as susceptibility and absorption. We are able to compare simulated spectroscopy models with spectroscopy data obtained from experiment to characterize the temperature of a rubidium vapor cell. These findings contribute to the ongoing development of quantum memory systems for efficient quantum repeaters.
Quantum technologies open doors to outstanding applications, at the same time as they pose many scientific challenges. The promise of intrinsically secure communications relies on the implementation of quantum networks. However, noise in quantum channels sets a limit to both the range and the faithfulness of the communication link. To overcome these difficulties, quantum repeater schemes have been proposed to successfully transmit flying qubits (single photons) over long distances. The aim of this project is to advance towards the implementation of a fully functional quantum memory, a key element of any quantum repeater scheme. To do so, a hot rubidium vapor cell was employed, which takes advantage of electromagnetically induced transparency to perform the light storage process, using, in this case, light from a quantum dot. The novelty of the work resides on the fact that never has light from a quantum dot been stored in such a memory device. These objectives implied improving the transmission efficiency (from 5% to 14%) following numerous steps, as well as finding and characterizing a suitable quantum dot sample. The work in hand presents the numerous accomplishments that have been achieved, which set the realization of a quantum repeater very close to our reach.
The success of long-distance quantum communication will hinge on quantum repeater nodes equipped with robust and scalable quantum memories. Such memories must possess specific operating characteristics to make these nodes practical. An attractive option for these memory devices is an atomic warm vapor system operating under the conditions of electromagnetically induced transparency (EIT). These systems are easy to implement and require relatively low equipment overhead. A key metric in atomic-based quantum memory performance is optical depth, as it is closely tied to the strength of light-matter coupling. Here, we simulate and measure the optical depth-based performance of an EIT quantum memory using a warm atomic vapor cell. We then translate the simulated and measured optical depth and efficiency metrics into expected entanglement distribution rates. Our analysis evaluates the feasibility of these memories in optical quantum repeater nodes, which are essential for robust long-distance quantum communication.
Quantum memory provides a platform for building quantum networks in quantum information processing. Applications of said networks include quantum gates for quantum computing and quantum repeaters for long distance quantum key distribution. An optical quantum memory can be realized by a cold atom system combined with electromagnetically induced transparency (EIT). However, room temperature quantum memory via vapor cells benefit from its easy operation without the need for laser cooling and trapping, promoting the scalability. In this work, we studied and tested EIT in a Rubidium vapor cell at room temperature, by storing and retrieving a classical light source using probe and control lasers. We also constructed a portable quantum memory system and realized the storage of light at the single-photon level at room temperature. For a future perspective, we designed the quantum memory system with cavities, wishing to breakthrough in storage efficiency. | 37 pages
Quantum technologies open doors to outstanding applications, at the same time as they pose many scientific challenges. The promise of intrinsically secure communications relies on the implementation of quantum networks. However, noise in quantum channels sets a limit to both the range and the faithfulness of the communication link. To overcome these difficulties, quantum repeater schemes have been proposed to successfully transmit flying qubits (single photons) over long distances. The aim of this project is to advance towards the implementation of a fully functional quantum memory, a key element of any quantum repeater scheme. To do so, a hot rubidium vapor cell was employed, which takes advantage of electromagnetically induced transparency to perform the light storage process, using, in this case, light from a quantum dot. The novelty of the work resides on the fact that never has light from a quantum dot been stored in such a memory device. These objectives implied improving the transmission efficiency (from 5% to 14%) following numerous steps, as well as finding and characterizing a suitable quantum dot sample. The work in hand presents the numerous accomplishments that have been achieved, which set the realization of a quantum repeater very close to our reach.
This thesis set out to investigate light storage based on dynamic electromagnetically induced transparency (EIT) in a room-temperature atomic ensemble of rubidium as a means to provide a quantum memory for single-photons created by a single rubidium atom coupled to a high-finesse optical resonator. Setting up the light storage medium presented a new addition to the research group's portfolio of experimental techniques and led to investigations of EIT, slow light and stored light in warm rubidium-87 vapour. Lambda level schemes connecting Zeeman or hyperfine substates on the D1 and D2 lines were addressed in rubidium vapour cells containing different buffer gases and different isotopic fractions of rubidium-87 and rubidium-85. Single beam spectroscopy with a weak probe was used to characterise the vapour cells. A numerical method to fit the D line spectrum to a theoretical model to include isotopic fractions and collisional broadening of a buffer gas has been implemented. Temperature and isotopic fractions could be reliably extracted from the fit parameters. For an offset-stabilisation of two lasers to address a lambda level scheme connecting the two different hyperfine groundstates in rubidium a phase locked loop including a frequency divider has been designed and implemented. Light storage and retrieval has been demonstrated using a Zeeman scheme on the D1 line. Two microsecond long classical light pulses containing one million photons on average were stored and retrieved with an efficiency of 15% after a delay of one microsecond. Several methods of attenuating the strong co-propagating control laser beam to allow for lowering the signal pulse intensity in future experiments are discussed.