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High-speed thin-film lithium niobate quantum processor driven by a solid-state quantum emitter.

Patrik I Sund¹, Emma Lomonte^2,3,4, Stefano Paesani¹

¹Center for Hybrid Quantum Networks (Hy-Q), Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, Copenhagen DK-2100, Denmark.

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|May 12, 2023

Summary

This study presents a novel integrated photonic platform for scalable quantum computing, merging thin-film lithium niobate with quantum dot single-photon sources for high-speed, low-loss quantum circuit operations.

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Area of Science:

Quantum Information Science
Integrated Photonics
Solid-State Physics

Background:

Scalable photonic quantum computing demands advanced photonic processing devices.
Key challenges include low-loss, high-speed reconfigurable circuits and deterministic single-photon sources.

Purpose of the Study:

To develop an integrated photonic platform for scalable quantum technologies.
To interface deterministic solid-state single-photon sources with reconfigurable photonic circuits.

Main Methods:

Development of an integrated photonic platform using thin-film lithium niobate.
Integration with deterministic solid-state single-photon sources based on quantum dots in nanophotonic waveguides.
Utilizing low-loss circuits programmable at gigahertz speeds for photon processing.

Main Results:

Demonstration of key photonic quantum information processing functionalities.
Successful implementation of on-chip quantum interference and photon demultiplexing.
Realization of a reprogrammable four-mode universal photonic circuit.

Conclusions:

The developed platform offers a promising heterogeneous approach for scaling up photonic quantum technologies.
Merging integrated photonics with solid-state photon sources addresses critical requirements for quantum computing.
High-speed, low-loss circuits and deterministic photon generation pave the way for advanced quantum applications.