Parallel preparation of a set of arbitrary path-polarization hyperentangled states

Hussien Garalnaby; Salem F. Hegazy; Salah L. Hasab Elnaby

doi:10.1117/12.2510115

4 March 2019 Parallel preparation of a set of arbitrary path-polarization hyperentangled states

Hussien Garalnaby, Salem F. Hegazy, Salah L. Hasab Elnaby

Proceedings Volume 10933, Advances in Photonics of Quantum Computing, Memory, and Communication XII; 109330W (2019) https://doi.org/10.1117/12.2510115
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

The simultaneous production of a set of arbitrary hyperentangled states is crucial for quantum machines running variant quantum protocols concurrently, like universal quantum computers and quantum communication hubs. We present an experimental method to prepare a set of arbitrary path-polarization hyperentangled states concurrently using non-collinear spontaneous parametric down-conversion (SPDC). A cascaded pair of type-I crystals are pumped by 405-nm diagonally-polarized beam to produce a noncollinear stream of photon pairs. Compensation crystals are inserted to correct for the angular slope of the relative phase of the produced polarization entangled state. The pathentangled states are created over four pairs of slits positioned at conjugate locations to the pump beam. The local relative-phases of the path and polarization states can be independently tailored by intercepting the SPDC emission by tiltable birefringent and glass plates. The amplitudes of the polarization states is controlled by the manipulation of the polarization state of the pump. Also, the amplitudes of the path states is accessed by translating the slits over the SPDC cone. Here, while a pure state describes the whole SPDC emission, the produced states can be deemed an independent set by avoiding paths balanced to less than the coherence-length.

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Hussien Garalnaby, Salem F. Hegazy, and Salah L. Hasab Elnaby "Parallel preparation of a set of arbitrary path-polarization hyperentangled states ", Proc. SPIE 10933, Advances in Photonics of Quantum Computing, Memory, and Communication XII, 109330W (4 March 2019); https://doi.org/10.1117/12.2510115

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KEYWORDS

Crystals

Polarization

Nonlinear crystals

Photon polarization

Photonic crystals

Quantum computing

Laser crystals

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