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Quantum photonics for quantum communications

Christophe Couteau

Published Sep 16, 2024• 0 citations
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Compact, high-performance hybrid photonic integrated circuits (PICs) are crucial for advancing Quantum Communications. This paper presents recent examples from the PolyBoard platform, including a time-bin interferometer, a DV-QKD transmitter, and a heralded single photon source. Keywords: Quantum communication and quantum cryptography, Photonic integration, Photonic integrated circuits, Planar lightwave circuits (PLCs), Photonic quantum communication, Single-photon and quantum entangled photon-pair sources
Recent years have witnessed significant progress in quantum communication and quantum internet with the emerging quantum photonic chips, whose characteristics of scalability, stability, and low cost, flourish and open up new possibilities in miniaturized footprints. Here, we provide an overview of the advances in quantum photonic chips for quantum communication, beginning with a summary of the prevalent photonic integrated fabrication platforms and key components for integrated quantum communication systems. We then discuss a range of quantum communication applications, such as quantum key distribution and quantum teleportation. Finally, the review culminates with a perspective on challenges towards high-performance chip-based quantum communication, as well as a glimpse into future opportunities for integrated quantum networks.
We propose a single-photon interferometer which provides cryptographic quantum communication equivalent to that obtained using a pair of polarization entangled photon twins as a carrier [Phys. Rev. A 60, 157 (1999)]. Instead of manipulating and measuring the internal states of entangled photon twins, cryptographic quantum communication is possible by manipulating a single photon in an extended interferometer. The use of the single-photon interferometer offers significant experimental advantages compared to our previous approach.