Directly comparing entanglement-enhancing non-Gaussian operations
New Journal of Physics IOP Publishing 17:2 (2015) 023038
Ultrahigh and persistent optical depths of cesium in Kagomé-type hollow-core photonic crystal fibers
Optics Letters Optical Society of America 40:23 (2015) 5582-5585
Abstract:
Alkali-filled hollow-core fibers are a promising medium for investigating light–matter interactions, especially at the single-photon level, due to the tight confinement of light and high optical depths achievable by light-induced atomic desorption (LIAD). However, until now these large optical depths could only be generated for seconds, at most once per day, severely limiting the practicality of the technology. Here we report the generation of the highest observed transient (>105 for up to a minute) and highest observed persistent (>2000 for hours) optical depths of alkali vapors in a light-guiding geometry to date, using a cesium-filled Kagomé-type hollow-core photonic crystal fiber (HC-PCF). Our results pave the way to light–matter interaction experiments in confined geometries requiring long operation times and large atomic number densities, such as generation of single-photon-level nonlinearities and development of single photon quantum memories.Heralded single photon storage in a room-temperature, broadband quantum memory
Optica Publishing Group (2014) 1-2
Nonclassical light manipulation in a multiple-scattering medium.
Optics letters 39:21 (2014) 6090-6093
Abstract:
We investigate the possibility of using a scattering medium as a highly multimode platform for implementing quantum walks. We demonstrate the manipulation of a single photon propagating through a strongly scattering medium using wavefront-shaping technique. Measurement of the scattering matrix allows the wavefront of the photon to be shaped to compensate the distortions induced by multiple scattering events. The photon can thus be directed coherently to a specific output mode. Using this approach, we show how entanglement of a single photon across different modes can be manipulated despite the enormous wavefront disturbance caused by the scattering medium.Observing optical coherence across Fock layers with weak-field homodyne detectors.
Nature communications 5 (2014) 5584