Multi-User Quantum Key Distribution with Entangled Photons from a Semiconductor Chip

Autebert, Claire; Trapateau, Julien; Orieux, Adeline; Lemaı̂tre, A.; Gomez-Carbonnel, Carme; Diamanti, Eleni; Zaquine, Isabelle; Ducci, S.

doi:10.1364/fio.2016.fth4f.4

Cited by 1 publication

(1 citation statement)

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“…As far as the semiconductor chip is concerned, the fabrication of highly efficient low loss waveguides is currently under intensive investigation; in particular the development of inductively coupled plasma (ICP) processes to etch straight flank waveguides while keeping low optical losses would increase the confinement of the interacting optical fields and consequently the efficiency of the parametric down conversion. Encouraging results have recently been obtained on our devices leading to a CAR on the order of 1700 [30].…”

Section: Discussionmentioning

confidence: 60%

Multi-user quantum key distribution with entangled photons from an AlGaAs chip

Autebert

Trapateau

Orieux

et al. 2016

Quantum Sci. Technol.

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In view of real world applications of quantum information technologies, the combination of miniature quantum resources with existing fibre networks is a crucial issue. Among such resources, on-chip entangled photon sources play a central role for applications spanning quantum communications, computing and metrology. Here, we use a semiconductor source of entangled photons operating at room temperature in conjunction with standard telecom components to demonstrate multi-user quantum key distribution, a core protocol for securing communications in quantum networks. The source consists of an AlGaAs chip emitting polarization entangled photon pairs over a large bandwidth in the main telecom band around 1550 nm without the use of any off-chip compensation or interferometric scheme; the photon pairs are directly launched into a dense wavelength division multiplexer (DWDM) and secret keys are distributed between several pairs of users communicating through different channels. We achieve a visibility measured after the DWDM of 87% and show long-distance key distribution using a 50-km standard telecom fibre link between two network users. These results illustrate a promising route to practical, resource-efficient implementations adapted to quantum network infrastructures.

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Section: Discussionmentioning

confidence: 60%