Diffraction-limited high-finesse optical cavities

Quantum Matter and Optic

Non-locality of high-dimensional two-photon orbital angular momentum states

Quantum Matter and Optic

How to observe high-dimensional two-photon entanglement with only two detectors

Quantum Matter and Optic

Effect of spatial filtering on the Schmidt decomposition of entangled photons

Quantum Matter and Optic

Angular phase plate analyzers for measuring the dimensionality of multi-mode fields

Quantum Matter and Optic

Fiber-connectorized micropillar cavities

Quantum Matter and Optic

Bounds and optimisation of orbital angular momentum bandwidths within parametric down-conversion systems

The measurement of high-dimensional entangled states of orbital angular momentum prepared by spontaneous parametric down-conversion can be considered in two separate stages: a generation stage and a detection stage. Given a certain number of generated modes, the number of measured modes is determined by the measurement apparatus. We derive a simple relationship between the generation and detection parameters and the number of measured entangled modes.Comment: 6 pages, 4 figure

Laser with thresholdless intensity fluctuations

We have studied the quantum-noise properties of a small slow-inversion laser experimentally and theoretically. As a function of pump rate, the average output intensity shows a sharp threshold, but the intensity fluctuations do not. Under quite generic conditions the intensity fluctuations of a sufficiently small slow-inversion laser show highly super-Poissonian statistics (even two times above threshold), due to the very weak damping of the spontaneous-emission-driven relaxation oscillation