Nonlinear π phase shift for single fibre-guided photons interacting with a single resonator-enhanced atom
By Jurgen Volz, Michael Scheucher, C. Junge, Arno Rauschenbeutel. Nature Photonics, 2014
153 citations recorded by the source corpus.
Realizing a strong interaction between individual photons is an important objective of research in quantum science and technology. It requires an optical medium in which light experiences a phase shift that depends nonlinearly on the photon number. Once the additional two-photon phase shift reaches π, such an ultra-strong nonlinearity could enable the implementation of high-fidelity quantum logic operations. However, the nonlinear response of standard optical media is orders of magnitude too weak. Here, we demonstrate a fibre-based nonlinearity that realizes an additional two-photon phase shift close to the ideal value of π. We employ a whispering-gallery-mode resonator, interfaced by an optical nanofibre, where the presence of a single rubidium atom in the resonator mode results in a strongly nonlinear response. We show that this results in entanglement of initially uncorrelated incident photons. This demonstration of a fibre-integrated, ultra-strong nonlinearity is a decisive step towards photon-based scalable quantum logics. A nonlinear π phase shift is induced by the interaction between a 85Rb atom and a fibre-coupled bottle resonator.
Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering
View Paper: https://www.semanticscholar.org/paper/45c898628c6e1c4c6ac0309ede1a7a45de0858d0
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Citations in the corpus
- Cavity-based quantum networks with single atoms and optical photons (2014, methodology): “…nonlinearities have been investigated in several experiments with atoms near whispering-gallery mode resonators (Aoki et al., 2009; Dayan et al., 2008; O’Shea et al., 2013; Volz et al., 2014), and with atoms or quantum dots in photonic crystal cavities (Reinhard et al., 2012; Tiecke et al., 2014).”
- Microwave photonics with superconducting quantum circuits (2017, background): “Several experiments have coupled natural atoms, trapped and cooled, to optical fibers [522–529] or to resonators that are in turn coupled to fibers [278,530].”