We have developed a novel millimetre-sized monolithic fibre-coupled rubidium saturated absorption spectroscopy laser reference suitable for quantum sensing applications. It is based on our novel MEMs vapour cell technology and bonding of optical elements to create a monolithic spectroscopy module. Our unit reproduces the signal visibility of a 70 mm long cell and is compatible with standard packaging techniques. The unit has no free-space elements that would otherwise be subject to vibration. Our reference uniquely combines the qualities of robustness, miniaturisation and signal strength providing an optimal solution for mobile quantum sensing platforms including space and aerospace.
THz imaging often struggles to achieve necessary framerates for applications, but recent demonstrations show that an imaging system based upon THz-to-optical conversion in atomic vapour can provide ultrahigh speeds while retaining sensitivity with optical cameras. This atomic vapour imaging requires a multi-frequency near-IR optical pumping system, and we demonstrate a compact system to provide the stable frequencies required for conversion of 0.55 THz light to visible (green) in caesium atoms. Through the integration of distributed feedback (DFB) laser diodes and a compact extended cavity diode laser, and spectroscopy and offset locks based on open-source FPGA and Arduino code, it approaches suitability for wider industrial application.
There is a fruitful interplay in the literature between quantum information theory and the study of vector beams, inspired by the mathematical structure shared by quantum entanglement and classical beams of light. As an example, measures of entanglement, notably concurrence, are widely used as measures of the quality of a vector beam. In addition, there is a close analogy, previously exploited in the literature, between polarimetry and qubit state tomography, which become identical tasks in the single photon limit. In this talk I will discuss the use of so-called POVM measurements in spatially-resolved polarimetry to characterise structured light beams.
Quantum 2.0 applications such as gravitational sensing require narrow linewidth lasers at specific wavelength and significant optical power. For single photon lidar applications such as to image through scattering media, intense yet short optical pulses are required. These are requirements not readily provided by existing laser systems. We suggest the use of master oscillator power amplifier (MOPA) systems consisting of a seed source providing the required spectral and temporal optical characteristics combined with a semiconductor based tapered amplifier to amplify the seed power to levels adequate for the required quantum applications. Considerations of the construction of such systems are discussed. Furthermore, there operational specifications will be determined and the suitability for quantum applications will be discussed.
Since (at least) a quarter of a century researchers are fascinated by light that carries orbital angular momentum. At Glasgow we routinely use a variety of techniques to imprint structure in the spatial amplitude, phase and polarization of a light beam, aiming to study the interaction with atomic vapours. In this presentation however, I will concentrate on the light fields themselves, and in particular on the strong correlations between the polarisation and spatial degree of freedom. We quantify these correlations via concurrence measurements, investigate their use for enhanced focussing, and employ them in a single-shot broad band polarimeter.
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