Synthesis and Analysis of Entangled Photonic Qubits in Spatial-Parity Space
arXiv:0708.3064 · doi:10.1103/PhysRevLett.99.250502
Abstract
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.
arXiv comment6 pages, 5 figures, submitted to PRL
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- Possibility of Coherent Phenomena like Bloch Oscillations with Single Photons via W-States
- Photonic circuits for generating modal, spectral, and polarization entanglement
- Sorting photon wave packets using temporal-mode interferometry based on multiple-stage quantum frequency conversion
- Modal and Polarization Qubits in Ti:LiNbO Photonic Circuits for a Universal Quantum Logic Gate
- Dispersion-based control of modal characteristics for parametric down-conversion in a multimode waveguide
- Spatial coherence effects on second- and fourth-order temporal interference
- Stable Mode Sorting by Two-Dimensional Parity of Photonic Transverse Spatial States
- Quantum interference and non-locality of independent photons from disparate sources
- Generation and characterization of discrete spatial entanglement in multimode nonlinear waveguides
- Nonlocality in Continuous-Variable Quantum Networks
- Polarization-based control of spin-orbit vector modes of light in biphoton interference