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General U(4) gate for photon polarization and orbital angular momentum
Craig S. Hamilton, Aurel Gabris, Igor Jex +1
We examine the implementation of an arbitrary U(4) gate consisting of CNOT gates and single qubit unitary gates for the Hilbert space of photon spin polarization and two states of…
Full characterisation of the quantum spiral bandwidth of entangled biphotons
Filippo M. Miatto, Alison M. Yao, Stephen M. Barnett
Spontaneous parametric down conversion has been shown to be a reliable source of entangled photons. Amongst the wide range of properties that have been shown to be entangled, it is…
Information erasure without an energy cost
Joan A. Vaccaro, Stephen M. Barnett
Landauer argued that the process of erasing the information stored in a memory device incurs an energy cost in the form of a minimum amount of mechanical work. We find, however, th…
Interference of composite bosons
Thomas Brougham, Stephen M. Barnett, Igor Jex
We investigate multi-boson interference. A Hamiltonian is presented that treats pairs of bosons as a single composite boson. This Hamiltonian allows two pairs of bosons to interact…