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Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)

Reconfigurable multi-mode entanglement within one beam

Seiji Armstrong, Jiří Janoušek, Boris Hage, J-F. Morizur, Hans‐A. Bachor, Ping Koy Lam

Published May 1, 2011• 0 citations
Publisher

Abstract

We present and characterize an alternative set of tools for flexible, computer reconfigurable, multimode entanglement. In our scheme, all the entangled modes are carried by orthogonal spatial modes on a single beam. One homodyne detection scheme employing multi-diode array detectors is used to simultaneously detect the desired modes within the single beam.

DOI
10.1109/cleoe.2011.5943364

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We present and characterize an alternative set of tools for flexible, computer reconfigurable, multimode entanglement. In our scheme, all the entangled modes are carried by orthogonal spatial modes on a single beam. One homodyne detection scheme employing multi-diode array detectors is used to simultaneously detect the desired modes within the single beam.
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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. Multi-partite entanglement is essential not only to understand large quantum ensembles but also to build useful quantum technologies. Armstronget al. demonstrate multimode entanglement of up to eight modes using programmable virtual networks based on linear optics that can be switched in real time.