Abstract
We demonstrate theoretically and experimentally a high level of control of the four-wave mixing process in an inert gas-filled inhibited-coupling guiding hollow-core photonic crystal fiber. The specific multiple-branch dispersion profile in such fibers allows both correlated and separable bi-photon states to be produced. By controlling the choice of gas and its pressure and the fiber length, we experimentally generate various joint spectral intensity profiles in a stimulated regime that is transferable to the spontaneous regime. The generated profiles may cover both spectrally separable and correlated bi-photon states and feature frequency tuning over tens of THz, demonstrating a large dynamic control that will be very useful when implemented in the spontaneous regime as a photon pair source.
Highlights
Entanglement is a key resource in quantum information and strong effort has been made to increase the Hilbert space dimension of the generated quantum states either through the number of particles involved or through the generation of qudits with dimension d 2 [1,2,3,4,5]
In this paper, we demonstrate that four-wave mixing (FWM) in gas-filled hollow-core fibers provides a versatile platform for generating and manipulating photon-pair states
In particular we show how the intrinsic multiband dispersion of IC fibers can be exploited to access multiband FWM and various joint spectral intensity (JSI) shapes corresponding to spectrally factorable or correlated photon pair states
Summary
Entanglement is a key resource in quantum information and strong effort has been made to increase the Hilbert space dimension of the generated quantum states either through the number of particles involved or through the generation of qudits with dimension d 2 [1,2,3,4,5]. While removing spatial and polarization entanglement can be achieved, the suppression of spectral correlations is generally challenging It requires stringent conditions on the optical nonlinear process and on the phase-matching condition. Integrated sources offer more flexibility in engineering the spectral entanglement at specific wavelengths, for instance by designing the poling period of the waveguide [8] or the microstructuration in photonic crystal fiber [9, 10] Within this context, tuning the photon pairs phase-matched frequencies has been reported using temperature control of a photonic chip [11], or fiber [12]. The given medium is a gas-filled inhibited-coupling (IC) guiding hollow-core photonic crystal fiber (HCPCF) with controllable dispersion and optical nonlinearity We used this feature to generate various joint spectral intensity (JSI) profiles, indicating the possibility to produce various degrees of spectral correlations. This is a first experimental step toward a versatile fibered and Raman-free photon-pair source
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