Integrated silicon photonics for high-speed quantum key distribution

Sibson, Philip; Kennard, Jake; Stanisic, Stasja; Erven, Chris; O’Brien, Jeremy L; Thompson, Mark G.

doi:10.1364/optica.4.000172

Cited by 230 publications

(181 citation statements)

References 36 publications

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“…Silicon photonic integrated circuits (PICs) are playing a major role on the development of quantum information based applications, such as quantum computation [1] and quantum communications [2]. Facilitated by the variety of optical components available for integration [3], silicon PICs have been designed to implement many quantum protocols such as, multidimensional entanglement [4], high-dimensional Quantum Key Distribution (QKD) [5] and Quantum Random Number Generation [6].…”

Section: Introductionmentioning

confidence: 99%

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Hong–Ou–Mandel interference between independent III–V on silicon waveguide integrated lasers

et al. 2019

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The versatility of silicon photonic integrated circuits has led to a widespread usage of this platform for quantum information based applications, including Quantum Key Distribution (QKD). However, the integration of simple high repetition rate photon sources is yet to be achieved. The use of weak-coherent pulses (WCPs) could represent a viable solution. For example, Measurement Device Independent QKD (MDI-QKD) envisions the use of WCPs to distill a secret key immune to detector side channel attacks at large distances. Thus, the integration of III-V lasers on silicon waveguides is an interesting prospect for quantum photonics. Here, we report the experimental observation of Hong-Ou-Mandel interference with 46 ± 2% visibility between WCPs generated by two independent III-V on silicon waveguide integrated lasers. This quantum interference effect is at the heart of many applications, including MDI-QKD. Our work represents a substantial first step towards an implementation of MDI-QKD fully integrated in silicon, and could be beneficial for other applications such as standard QKD and novel quantum communication protocols.

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Section: Introductionmentioning

confidence: 99%

“…In fact, silicon PICs with integrated III-V sources would facilitate miniaturization and integration with existing telecommunications infrastructures. QKD, * dabac@fotonik.dtu.dk for example, has already been attracted by integrated photonic technologies [2,12].…”

Section: Introductionmentioning

confidence: 99%

Hong–Ou–Mandel interference between independent III–V on silicon waveguide integrated lasers

et al. 2019

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“…Photonic integrated circuits, which combine multiple optical components onto a small semiconductor chip, are the best candidates to respond to this demand. Recent demonstrations of all integrated indium phosphide QKD transmitters 9 and high-speed silicon photonics QKD encoders [10][11][12] have shown the advantage of integration in terms of stability and miniaturization of single channels. However the difficulty in realizing quantum state encoding in compact and power efficient circuits still hinders progress towards high-density integration and therefore large-scale deployment of the QKD technology.…”

Section: Introductionmentioning

confidence: 99%

A modulator-free quantum key distribution transmitter chip

et al. 2019

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Quantum key distribution (QKD) has convincingly been proven compatible with real life applications. Its wide-scale deployment in optical networks will benefit from an optical platform that allows miniature devices capable of encoding the necessarily complex signals at high rates and with low power consumption. While photonic integration is the ideal route toward miniaturisation, an efficient route to high-speed encoding of the quantum phase states on chip is still missing. Consequently, current devices rely on bulky and high power demanding phase modulation elements which hinder the sought-after scalability and energy efficiency. Here we exploit a novel approach to high-speed phase encoding and demonstrate a compact, scalable and power efficient integrated quantum transmitter. We encode cryptographic keys on-demand in high repetition rate pulse streams using injection-locking with deterministic phase control at the seed laser. We demonstrate record secure-key-rates under multiprotocol operation. Our modulator-free transmitters enable the development of high-bit rate quantum communications devices, which will be essential for the practical integration of quantum key distribution in high connectivity networks.

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“…For degenerate SFWM pumped by mono-color light with frequency of p ω and power of P, the nonlinear phase mismatch in Eq. (5) is [31] 2 NL k P γ Δ = (13) where γ is the effective nonlinear coefficient of the waveguide at p ω , calculated by Eq. (10).…”

Section: Appendix: Expressions Of the Biphoton Spectra Generated By Nmentioning

confidence: 99%

Hybrid waveguide scheme for silicon-based quantum photonic circuits with quantum light sources

Yuan

et al. 2020

Photon. Res.

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We propose a hybrid silicon waveguide scheme to avoid the impact of noise photons induced by pump lights in application scenarios of quantum photonic circuits with quantum light sources. The scheme is composed of strip waveguide and shallow-ridge waveguide structures. It utilizes the difference of biphoton spectra generated by spontaneous four wave mixing (SFWM) in these two waveguides. By proper pumping setting and signal/idler wavelength selection, the generation of desired photon pairs is confined in the strip waveguide. The impact of noise photons generated by SFWM in the shallow-ridge waveguide could be avoided. Hence, the shallow-ridge waveguide could be used to realize various linear operation devices for pump light and quantum state manipulations. The feasibility of this scheme is verified by theoretical analysis and primary experiment. Two applications are proposed and analyzed, showing its great potential on silicon-based quantum photonic circuits. 1 W -1 at 1552.5 nm) than that of the shallow-ridge waveguide (93.5 m -1 W -1 at 1552.5 nm), since the strip waveguide has a much smaller effective mode field area.

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Integrated silicon photonics for high-speed quantum key distribution

Cited by 230 publications

References 36 publications

Hong–Ou–Mandel interference between independent III–V on silicon waveguide integrated lasers

Hong–Ou–Mandel interference between independent III–V on silicon waveguide integrated lasers

A modulator-free quantum key distribution transmitter chip

Hybrid waveguide scheme for silicon-based quantum photonic circuits with quantum light sources

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