Two-photon interference of single photons from dissimilar sources

Dangel, Christian, Schmitt, Jonas, Bennett, Anthony J. ORCID: https://orcid.org/0000-0002-5386-3710, Müller, Kai and Finley, Jonathan J. 2022. Two-photon interference of single photons from dissimilar sources. Physical Review Applied 18 (5) , 054005. 10.1103/PhysRevApplied.18.054005

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Abstract

Entanglement swapping and heralding are at the heart of many protocols for distributed quantum information. For photons, this typically involves Bell-state measurements based on two-photon interference effects. In this context, hybrid systems that combine high rate, ultrastable, and pure quantum sources with long-lived quantum memories are particularly interesting. Here, we develop a theoretical description of pulsed two-photon interference of photons from dissimilar sources to predict the outcomes of second-order cross-correlation measurements. These are directly related to, and hence used to quantify, photon indistinguishability. We study their dependence on critical system parameters such as quantum state lifetime and emission frequency, and quantify the impact of time jitter, pure dephasing, and spectral wandering. We show that for a fixed lifetime of one of the two emitters, for each frequency detuning there is an optimal lifetime of the second emitter that leads to the highest photon indistinguishability. Expectations for different hybrid combinations involving III-V semiconductor quantum dots, color centers in diamond, atom-scale defects in two-dimensional materials and neutral atoms are quantitatively compared for real-world system parameters. Our work provides a theoretical basis for the treatment of dissimilar emitters and enables assessment of which imperfections can be tolerated in hybrid photonic quantum networks.

Item Type:	Article
Date Type:	Published Online
Status:	Published
Schools:	Engineering
Publisher:	American Physical Society
ISSN:	2331-7019
Date of First Compliant Deposit:	30 November 2022
Date of Acceptance:	26 September 2022
Last Modified:	11 May 2023 15:20
URI:	https://orca.cardiff.ac.uk/id/eprint/154523

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