With recent developments in the field of quantum computing and cryptography, establishing quantum networks would allow for the implementation of post-quantum cryptographic protocols, distributed quantum computing, and quantum sensor networks. Though, quantum networks require the use of quantum repeaters to preserve the transmitted quantum information over long distances. This work focuses on the implementations of quantum frequency conversion which is used to ensure the signal is of a suitable frequency for transmission between the different optical components in the system.
We present an assortment of experiments exploring loading, control, and probing of laser-cooled caesium atoms inside a hollow-core photonic-bandgap fiber.
Laser locking is a crucial tool in various scientific applications, especially in the field of atomic physics, where the laser's frequency must be stable with respect to the frequencies of atomic transitions. This work aims to leverage the advantages of 3D printed push-fit slots to achieve an inexpensive, compact, and highly customizable optical setup for locking lasers to the frequency of transition between two excited, and thus unpopulated, electron states of a neutral atom. In our approach, the optical components are mounted in custom 3D printed slots instead of traditional optical posts to decrease costs and overall size. The error signal is then created by an Electromagnetically Induced Transparency (EIT) signal in a Two-Photon Dichroic Atomic Vapor Laser Lock (T-P DAVLL), corresponding to the 6S1/2, 6P1/2, and 8S1/2 states of Cesium.
We describe the development and applications of a single-photon source based on a quantum dot embedded in a semiconductor nanowire, which can be precision-tuned to emit ∼1ns long photons at wavelengths that match the transitions of caesium D1 line. We discuss interfacing such single-photon source with atomic ensembles and present our experimental results demonstrating a new method of tuning the emission of the quantum dot by condensing inert gas (N2) on the nanowire. Next, we describe how these single photons at ∼895nm can be efficiently converted to wavelength suitable for satellite QKD links (∼794 nm) and optical fiber links (∼1469 nm) using a laser-cooled atomic ensemble that is loaded and confined inside a hollow-core optical fiber. Lastly, we inroduce our proposal of integrating the semiconductor nanowire with a lensed fiber to create a compact single-photon source with improved photon-collection efficiency compared to conventional setups.
We describe the experimental progress and the challenges of integrating a single photon source based on quantum dots embedded in semiconductor nanowires with a cold-atom experiment in which laser-cooled caesium atoms are loaded and confined inside a hollow-core micro-structured optical fiber. We focus in particular on wavelength conversion of the photons between 895nm and wavelengths suitable for satellite links (~794nm).
We explore Fabry-Perot cavities formed by a pair of photonic-crystal slabs acting as mirrors as a platform for quantum optics at low light levels. We present our recent experimental demonstrations of polarization dichroic mirrors for both linearly and circularly polarized light and propose schemes in which cavities formed by such mirrors can be used to create single-photon optical nonlinearities in atomic ensembles.
We report loading of laser-cooled caesium atoms into a hollow-core photonic-bandgap fiber and confining the atoms in the fiber’s 7μm diameter core with a red-detuned dipole trap. In this system, the atom-photon interaction probability is in the range of 0.5% and optical depths exceeding 100 can be achieved. We discuss the outlooks for photon storage and nonlinear optics at low light levels, such as cross-phase modulation and single-photon wavelength conversion, in this system.
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