Abstract
Many protocols in quantum science, for example, linear optical quantum computing, require access to largescale entangled quantum states. Such systems can be realized through manyparticle qubits, but this approach often suffers from scalability problems. An alternative strategy is to consider a lesser number of particles that exist in highdimensional states. The spatial modes of light are one such candidate that provides access to highdimensional quantum states, and thus they increase the storage and processing potential of quantum information systems. We demonstrate the controlled engineering of twophoton highdimensional states entangled in their orbital angular momentum through HongOuMandel interference. We prepare a large range of highdimensional entangled states and implement precise quantum state filtering. We characterize the full quantum state before and after the filter, and are thus able to determine that only the antisymmetric component of the initial state remains. This work paves the way for highdimensional processing and communication of multiphoton quantum states, for example, in teleportation beyond qubits.
Original language  English 

Article number  e1501165 
Journal  Science Advances 
Volume  2 
Issue number  2 
DOIs  
Publication status  Published  5 Feb 2016 
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Jonathan Leach
 School of Engineering & Physical Sciences  Professor
 School of Engineering & Physical Sciences, Institute of Photonics and Quantum Sciences  Professor
Person: Academic (Research & Teaching)