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Dataset for paper: Improving the indistinguishability of single photons from an ion-cavity system

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posted on 28.09.2020, 11:14 by Matthias Keller, Thomas Walker, Samir Vartabi Kashanian, Travers Ward
Data file for the figures in paper published in Physical Review A, Sept 2020

The file contains all data to reproduce the figures in the publication. Details are described within the spreadsheet.


Abstract
We investigate two schemes for generating indistinguishable single photons, a key feature of quantum networks, from a trapped ion coupled to an optical cavity. Through selection of the initial state in a cavity-assisted Raman transition, we suppress the detrimental effects of spontaneous emission on the photon's coherence length, measuring a visibility of 81(2)% without subtraction of background counts in a Hong-Ou-Mandel interference measurement, the highest reported for an ion-cavity system. In comparison, a visibility of 50(2)% was measured using a more conventional single-photon scheme. We demonstrate through numerical analysis of the single-photon generation process that our scheme produces photons of a given indistinguishability with a greater efficiency than the conventional one. Single-photon schemes such as the one demonstrated here have applications in distributed quantum computing and communications, which rely on high-fidelity entanglement swapping and state transfer through indistinguishable single photons.

Funding

Engineering and Physical Sciences Research Council (EPSRC) through the UK Quantum Technology Hub: NQIT - Networked Quantum Information Technologies EP/M013243/1.

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