Synthesis and Analysis of Entangled Photonic Qubits in Spatial-Parity Space

Details Synthesis and Analysis of Entangled Photonic Qubits in Spatial-Parity Space Synthesis and Analysis of Entangled Photonic Qubits in Spatial-Parity Space

2007-08-22

arxiv.org/abs/0708.3064v1

Phys. Rev. Lett. 99, 250502 (2007)

Physics

Quantum Physics

6 pages, 5 figures, submitted to PRL

Scientific paper

10.1103/PhysRevLett.99.250502

We present the novel embodiment of a photonic qubit that makes use of one continuous spatial degree of freedom of a single photon and relies on the the parity of the photon's transverse spatial distribution. Using optical spontaneous parametric downconversion to produce photon pairs, we demonstrate the controlled generation of entangled-photon states in this new space. Specifically, two Bell states, and a continuum of their superpositions, are generated by simple manipulation of a classical parameter, the optical-pump spatial parity, and not by manipulation of the entangled photons themselves. An interferometric device, isomorphic in action to a polarizing beam splitter, projects the spatial-parity states onto an even--odd basis. This new physical realization of photonic qubits could be used as a foundation for future experiments in quantum information processing.

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