|Title||Manipulation of single-photon states encoded in transverse spatial modes: Possible and impossible tasks|
|Publication Type||Journal Article|
|Year of Publication||2008|
|Authors||Calvo, GF, Picon, A|
|Journal||Physical Review A (Atomic, Molecular, and Optical Physics)|
Controlled generation and manipulation of photon states encoded in their spatial degrees of freedom is a crucial ingredient in many quantum-information tasks exploiting higher-than-two dimensional encoding. Here, we prove the impossibility to arbitrarily modify d-level state superpositions (qudits) for d>2, encoded in the transverse modes of light, with optical components associated to the group of symplectic transforms (Gaussian operations). Surprisingly, we also provide an explicit construction of how non-Gaussian operations acting on mode subspaces do enable one to overcome the limit d=2. In addition, this set of operations realizes the full SU(3) algebra.