Abbreviated Journal Title
Phys. Rev. A
BELL INEQUALITY; INTERFERENCE; MOMENTUM; ENTANGLEMENT; VIOLATION; Optics; Physics, Atomic, Molecular & Chemical
Increasing the information-carrying capacity of a single photon may be achieved by utilizing multiple degrees of freedom. We describe here an approach that utilizes two degrees of freedom to encode three qubits per photon: one in polarization and two in the spatial-parity symmetry of the transverse field. In this conception, a polarization-sensitive spatial light modulator corresponds to a three-qubit controlled-unitary gate with one control qubit (polarization) and two target (spatial-parity-symmetry) qubits. We describe the construction of controlled-NOT (CNOT), n root CNOT, controlled-PHASE, and Fredkin gates, and the preparation of one-photon, three-qubit Greenberger-Horne-Zeilinger (GHZ) and W states. This approach enables simple optical implementations of few-qubit tasks in quantum information processing.
Physical Review A
Abouraddy, Ayman F.; Giuseppe, Giovanni Di; Yarnall, T. M.; Teich, M. C.; and Saleh, Bahaa E. A., "Implementing one-photon three-qubit quantum gates using spatial light modulators" (2012). Faculty Bibliography 2010s. 2186.