On-chip tunable quantum interference in a lithium niobate-on-insulator photonic integrated circuit
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Date
2024-07
Publication Type
Journal Article
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yes
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Abstract
Programmable interferometric circuits are at the heart of integrated quantum photonic processors. While the lithium niobate-on-insulator platform has the potential to advance integrated quantum photonics due to its strong nonlinearity and tight mode confinement, the demonstration of reconfigurable two-photon interference has not yet been achieved. Here, we design, fabricate and characterize the building block of such interferometric networks in the form of a 2x2 Mach-Zehnder Interferometer. We use a thermo-optic phase shifter to achieve stable performance with a power consumption of Pπ = 44.4 mW and sub-microsecond switching times. We demonstrate the effectiveness of our device for quantum applications by measuring single-photon routing with up to 34 dB extinction ratio. We show Hong-Ou-Mandel interference with fully tunable visibilities reaching a maximum value of 97.4 ± 1.0 %. As part of large scale quantum photonic circuits, this building block will facilitate reconfigurable and tunable photonic processing units integrated alongside non-classical light sources.
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published
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Book title
Journal / series
Volume
9 (3)
Pages / Article No.
35040
Publisher
IOP Publishing
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Edition / version
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Software
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Date collected
Date created
Subject
lithium niobate-on-insulator; Mach-Zehnder interferometer; tunability; single photons; Hong-Ou-Mandel interference; thermo-optic effect; integrated photonics
Organisational unit
09531 - Grange, Rachel / Grange, Rachel
02205 - FIRST-Lab / FIRST Center for Micro- and Nanoscience
Notes
Funding
208707 - Lithium niobate-on-insulator photonics for linear optical quantum computing (SNF)
194693 - Maturing and scaling up fabrication of lithium-niobate-based integrated photonic sensors - LINIOS (SNF)
206008 - Integrated Phase Logic Networks (SNF)
714837 - Second-Order Nano-Oxides for Enhanced Nonlinear Photonics (EC)
101016138 - Novel Photonics Integrated Circuit (PIC) Technology building blocks (EC)
194693 - Maturing and scaling up fabrication of lithium-niobate-based integrated photonic sensors - LINIOS (SNF)
206008 - Integrated Phase Logic Networks (SNF)
714837 - Second-Order Nano-Oxides for Enhanced Nonlinear Photonics (EC)
101016138 - Novel Photonics Integrated Circuit (PIC) Technology building blocks (EC)