Scheme for the generation of hybrid entanglement between time-bin and wavelike encodings

Abstract

We propose a scheme for the generation of hybrid states entangling a single photon time-bin qubit with a coherent state qubit encoded on phases. Compared to other reported solutions, timebin encoding makes hybrid entanglement particularly well adapted to applications involving long distance propagation in optical fibres. This makes our proposal a promising resource for future outof-the-laboratory quantum communication. In this perspective, we analyse our scheme by taking into account realistic experimental resources and discuss the impact of their imperfections on the quality of the obtained hybrid state.

Implementable Hybrid Entanglement Witness

“…We choose to stick to a specific experimental setup to produce a concrete and experimentally realistic example of an efficient hybrid entanglement detection. However, the construction of the witness enables its adaptation to other experimental platforms using different encodings, as for instance in [42], as we will show. After introducing the set-up, we analyse the evolution of the hybrid entangled state of interest under a general noise model (II) and show that we can define a suitable witness using only measurable genuinely hybrid observables (III).…”

“…An example is near deterministic teleportation with high fidelities [4][5][6], steering [17], Bell protocols [7][8][9][10] and hybrid quantum repeaters [11,18]. Quantum information processing using this technique is currently being developed both theoretically [12,13,19] and experimentally [14][15][16][17]42].…”