Programmable multimode quantum networks

Seiji Armstrong (), Jean-François Morizur, Jiri Janousek, Boris Hage, Nicolas Treps, Ping Koy Lam and Hans-A. Bachor
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Seiji Armstrong: Australian Centre for Quantum-Atom Optics, The Australian National University
Jean-François Morizur: Australian Centre for Quantum-Atom Optics, The Australian National University
Jiri Janousek: Australian Centre for Quantum-Atom Optics, The Australian National University
Boris Hage: Australian Centre for Quantum-Atom Optics, The Australian National University
Nicolas Treps: Laboratoire Kastler Brossel, Université Pierre et Marie Curie Paris 6, ENS, CNRS
Ping Koy Lam: Australian Centre for Quantum-Atom Optics, The Australian National University
Hans-A. Bachor: Australian Centre for Quantum-Atom Optics, The Australian National University

Nature Communications, 2012, vol. 3, issue 1, 1-8

Abstract: Abstract Entanglement between large numbers of quantum modes is the quintessential resource for future technologies such as the quantum internet. Conventionally, the generation of multimode entanglement in optics requires complex layouts of beamsplitters and phase shifters in order to transform the input modes into entangled modes. Here we report the highly versatile and efficient generation of various multimode entangled states with the ability to switch between different linear optics networks in real time. By defining our modes to be combinations of different spatial regions of one beam, we may use just one pair of multi-pixel detectors in order to measure multiple entangled modes. We programme virtual networks that are fully equivalent to the physical linear optics networks they are emulating. We present results for N=2 up to N=8 entangled modes here, including N=2, 3, 4 cluster states. Our approach introduces the highly sought after attributes of flexibility and scalability to multimode entanglement.

Date: 2012
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DOI: 10.1038/ncomms2033

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