Measurements towards providing security assurance for a chip-scale QKD system

Vaquiero-Stainer, A.; Hart, Andy; Kirkwood, Robert A.; Semenenko, Henry; Burenkov, Viacheslav; Sibson, Philip; Chunnilall, Christopher J.; Erven, Chris; Thompson, Mark G.; Sinclair, Alastair G.

doi:10.1117/12.2307409

Cited by 2 publications

(1 citation statement)

References 3 publications

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“…Because of these kinds of engineering challenges, noise in the electrical signals which drive electro-optic modulators has been identified as a key issue in realising large scale optical switching networks for classical computing applications [1]. In quantum communication schemes, intersymbol interference effects have been highlighted as a potential security flaw in integrated photonic quantum communication systems [23]. Drive-noise is also identified as the expected dominant source of stochastic noise in LOQC [11].…”

Section: Mzi Mzlmentioning

confidence: 99%

Drive-noise tolerant optical switching inspired by composite pulses

Bulmer¹,

Jones²

2020

Opt. Express

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Electro-optic modulators within Mach-Zehnder interferometers are a common construction for optical switches in integrated photonics. A challenge faced when operating at high switching speeds is that noise from the electronic drive signals will effect switching performance. Inspired by the Mach-Zehnder lattice switching devices of Van Campenhout et al. [Opt. Express, 17, 23793 (2009)] and techniques from the field of Nuclear Magnetic Resonance known as composite pulses, we present switches which offer protection against drive-noise in both the on and off state of the switch for both the phase and intensity information encoded in the switched optical mode.

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Section: Mzi Mzlmentioning

confidence: 99%

Drive-noise tolerant optical switching inspired by composite pulses

Bulmer¹,

Jones²

2020

Opt. Express

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Quantum key distribution transmitter chip based on hybrid-integration of silica and lithium niobates

Li¹,

Wang²,

Zhang³

et al. 2022

Chinese Phys. B

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A quantum key distribution transmitter chip based on hybrid‐integration of silica planar light‐wave circuit (PLC) and lithium niobates (LN) modulator PLC is presented. The silica part consists of a tunable directional coupler and 400 ps delay line, and the LN part is made up of a Y‐branch, with electro‐optic modulators on both arms. The two parts are facet‐coupled to form an asymmetric Mach‐Zehnder interferometer. We have successfully encoded and decoded four BB84 states at 156.25 MHz repetition rate. Fast phase‐encoding of 0 or π has been achieved, with interference fringe visibilities 78.53% and 82.68% for state |+> and |‐>, respectively. With the aid of an extra off‐chip LN intensity modulator, two time‐bin states have been prepared and the extinction ratios are 18.65 dB and 15.46 dB for state |0> and |1>, respectively.

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Measurements towards providing security assurance for a chip-scale QKD system

Cited by 2 publications

References 3 publications

Drive-noise tolerant optical switching inspired by composite pulses

Drive-noise tolerant optical switching inspired by composite pulses

Quantum key distribution transmitter chip based on hybrid-integration of silica and lithium niobates

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