Entanglement is a central resource in quantum technologies. In this respect, high-dimensional entangled states are very promising for developing robust quantum communication schemes and enhanced imaging protocols. Being able to quantify high-dimensional entanglement quickly and accurately is therefore essential. However, to date, all experimental methods use assumptions about the detected state or imperfect measurement techniques, such as single-outcomes and accidental subtractions. Entanglement certification processes are therefore not only slow, but they also contain loopholes, which is not acceptable in adversarial scenarios such as quantum key distribution (QKD). In our work, we demonstrate the certification of high-dimensional entanglement using an event-based single-photon sensitive camera by performing measurements in two mutually unbiased bases. Our work provides an experimental method allowing for the efficient characterization of high-dimensional quantum states, paving the way for the development of high-dimensional QKD protocols and practical photon-pairs-based quantum imaging approaches.
The hybrid light-matter character of exciton-polaritons enables strikingly long-range energy transport in organic materials. We use femtosecond transient absorption microscopy to probe this behavior in the initial coherent regime, where photon and exciton wavefunctions are inextricably mixed. We achieve rapid polaritonic transport in highly ordered, pure organic semiconductor films without any external cavity. In a disordered system, confinement within a Fabry-Perot cavity provides enables comparable coherent transport effects. In both cases, the polaritons don’t travel alone: they are accompanied by intracavity dark states, which reduce the transport velocity, extend the lifetime, and provide a new mechanism for external control.
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