Rostock 2019 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 34: Quantum Information (Quantum Communication) I
Q 34.5: Talk
Wednesday, March 13, 2019, 15:00–15:15, S HS 002 Chemie
High-dimensional multiport for structured photons — •Robert Fickler1,2, Florian Brandt1, Frederic Bouchard3, and Marcus Huber1 — 1Institute for Quantum Optics and Quantum Information (IQOQI), Austrian Academy of Sciences, Vienna, Austria — 2Laboratory of Photonics, Tampere University of Technology, Tampere, Finland — 3Department of Physics, University of Ottawa, Ottawa, Canada
Light with a complex transverse amplitude structure invokes interesting fundamental properties and enables novel applications in classical and quantum optical experiments. One particularly interesting application is the use of structured photons as high-dimensional quantum states that are known to be beneficial in various quantum information tasks. However, to use their full potential the ability to perform any unitary operations is indispensable. So far, only cyclic operations on a specific subset of spatial modes, i.e. azimuthally structured photons, have been realized. Here, we present a scheme to perform any unitary operation on all transverse spatial modes using multiple phase modulations, which are designed by wavefront matching techniques. We implement this so-called multiport for spatial modes by multiple reflections of a phase-only spatial light modulator and perform a broad range of single photon operations, including X and Z-gates for all types of spatial modes and controlled quantum gates for high-dimensional quantum states. Our result will pave the way to perform quantum computation tasks using only one beam path without the need for interferometric setups.