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Nanosystems Physics Chemistry Mathematics

Generation of pure single-photon states in commercial photonic-crystal fibers on telecommunication frequencies

Anvar A. Talipov, Artemiy G. Shmelev, Anatoly Shukhin, Латыпов Ильнур Зиннурович

Published Jun 15, 2017• 0 citations
Publisher

Abstract

We studied the theoretical possibility of generating single-photon states in fibers with active profile dispersion formed by spontaneous four-wave mixing (SFWM) using femtosecond laser pulses.The possibility of eliminating the spectral correlation for single-photon states generated in commercial fibers was assessed.To model the structure of photonic crystal fibers and the modes of SFWM generation, an optimization was performed on the parameters of the pump and the fiber structure.

DOI
10.17586/2220-8054-2017-8-3-347-350

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We studied the theoretical possibility of generating single-photon states in fibers with active profile dispersion formed by spontaneous four-wave mixing (SFWM) using femtosecond laser pulses.The possibility of eliminating the spectral correlation for single-photon states generated in commercial fibers was assessed.To model the structure of photonic crystal fibers and the modes of SFWM generation, an optimization was performed on the parameters of the pump and the fiber structure.
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We present a study of the spectral properties of photon pairs generated through the process of spontaneous four-wave mixing (SFWM) in single mode fiber. Our analysis assumes narrowband pumps, which are allowed to be frequency degenerate or nondegenerate. Based on this analysis, we derive conditions on the pump frequencies and on the fiber dispersion parameters which guarantee the generation of ultrabroadband photon pairs. Such photon pairs are characterized by (i) a very large degree of entanglement, and (ii) a very high degree of temporal synchronization between the signal and idler photons. Through a numerical exercise, we find that the use of photonic crystal fiber (PCF) facilitates the fulfilment of the conditions for ultrabroadband photon pair generation; in particular, the spectral region in which emission occurs can be adjusted to particular needs through an appropriate choice of the PCF parameters. In addition, we present a quantum interference effect, resulting from indistinguishable pathways to the same outcome, which can occur when pumping a SFWM source with multiple spectral lines.
We present a theoretical study of the generation of photon pairs by spontaneous four‐wave mixing (SFWM) in photonic crystal optical fiber. We show that it is possible to engineer two‐photon states with specific spectral entanglement properties suitable for quantum information processing applications. In this work, we concentrate on states exhibiting no spectral correlations in the two‐photon component of the state, which allow heralding of pure‐state, single‐photon wavepackets without the need for spectral post filtering. We present specific source designs which permit both symmetric and asymmetric factorable states, with signal and idler photons in the visible, and sufficiently removed from the pump to ensure suppression of background photons produced by spontaneous Raman scattering.
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