Preservation of photon indistinguishability after transmission through surface-plasmon-polariton waveguide

Fujii, Go; Segawa, Toshiya; Mori, Shigehiko; Namekata, Naoto; Fukuda, Daiji; Inoue, Shuichiro

doi:10.1364/ol.37.001535

Cited by 28 publications

(14 citation statements)

References 22 publications

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“…Studies using periodic metallic hole arrays provided the first experimental evidence that quantum entanglement can be preserved in the photon-SPP-photon conversion process [7][8][9]. Furthermore, the nonclassical statistics of SPPs have been demonstrated using basic quantum Hong-Ou-Mandel (HOM) interference [10], in both long-range plasmonic waveguides (weakly confining waveguide) [11] and sub-wavelength metal plasmonic waveguides [12]. These studies indicate that assembling quantum PICs (QPICs) using plasmonic components is possible.…”

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confidence: 99%

High-Visibility On-Chip Quantum Interference of Single Surface Plasmons

Cai

Ren

et al. 2014

Phys. Rev. Applied

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Quantum photonic integrated circuits (QPICs) based on dielectric waveguides have been widely used in linear optical quantum computation. Recently, surface plasmons have been introduced to this application because they can confine and manipulate light beyond the diffraction limit. In this study, the on-chip quantum interference of two single surface plasmons was achieved using dielectric-loaded surface-plasmon-polariton waveguides. The high visibility (greater than 90%) proves the bosonic nature of single plasmons and emphasizes the feasibility of achieving basic quantum logic gates for linear optical quantum computation. The effect of intrinsic losses in plasmonic waveguides with regard to quantum information processing is also discussed. Although the influence of this effect was negligible in the current experiment, our studies reveal that such losses can dramatically reduce quantum interference visibility in certain cases; thus, quantum coherence must be carefully considered when designing QPIC devices.Photonic integrated circuits (PICs), in which multiple photonic functional components comprise a single chip, have attracted considerable attention owing to their small footprints, scalability, reduced power consumption, and enhanced processing stability. In addition to their wide application in classical information processing, integrated photonic quantum logic gates and Shor's quantum factoring algorithm have been demonstrated on these chips [1, 2]; thus, they show great feasibility and high operation fidelity. More recently, much effort has been dedicated to surface plasmon polaritons (SPPs), which are electron density waves excited at the interface between a metal and a dielectric material [3]to further condense PICs beyond the diffraction limit. Not only can SPPs confine light at the nanoscale [4], they are also useful for integrated polarization-controlling devices [5,6]. Studies using periodic metallic hole arrays provided the first experimental evidence that quantum entanglement can be preserved in the photon-SPP-photon conversion process [7][8][9]. Furthermore, the nonclassical statistics of SPPs have been demonstrated using basic quantum Hong-Ou-Mandel (HOM) interference [10], in both long-range plasmonic waveguides (weakly confining waveguide) [11] and sub-wavelength metal plasmonic waveguides [12]. These studies indicate that assembling quantum PICs (QPICs) using plasmonic components is possible.However, two obstacles remain that hinder the development of SPP-based QPICs. The first is that the experimental raw visibility of the quantum interference realized in plasmonic waveguides is below 50% [12], which is the boundary between classical and quantum interference. This low visibility is not compelling evidence that single plasmons are usable for quantum information processing. Interference visibility is so important that higher quantum interference visibility implies higher operation fidelity and a higher probability of success. For example, the HOM interference with 95% visibility * renxf@ustc.edu.c...

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confidence: 99%

High-Visibility On-Chip Quantum Interference of Single Surface Plasmons

Cai

Ren

et al. 2014

Phys. Rev. Applied

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“…The single LR-SPPs were launched into each input port of the LRSPP-WGC by signal and idler photons generated via a spontaneous parametric down conversion process. Assuming that the launched single LR-SPPs inherited the indistinguishability of 99 % between the signal and idler photons (the indistinguishability is well maintained after the photon-SPP-photon mode conversions 14 ), the coupling ratio of LRSPP-WGC was estimated to be 64:36 via the twophoton interference experiments. 15 …”

Section: Discussionmentioning

confidence: 99%

Mach-Zehnder interferometer using a long-range surface plasmon polariton waveguide coupler

et al. 2012

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“…Recent work using plasmonic waveguides has hinted that SPPs are bosons by observing the Hong-Ou-Mandel (HOM) effect, both indirectly using a photonic beamsplitter [58] and directly using a plasmonic beamsplitter ( Figure 1.15) [59]. However, the question as to whether quantum interference is in- volved remains open due to the modest HOM interference observed in these previous reports and shown in Figure 1.15(b), which can also be obtained using classical light [60][61][62][63].…”

Section: Spps In the Quantum Regime: State Of The Artmentioning

confidence: 99%

Quantum Plasmonics: From Quantum Statistics to Quantum Interferences

Martino

2016

Reviews in Plasmonics

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Preservation of photon indistinguishability after transmission through surface-plasmon-polariton waveguide

Cited by 28 publications

References 22 publications

High-Visibility On-Chip Quantum Interference of Single Surface Plasmons

High-Visibility On-Chip Quantum Interference of Single Surface Plasmons

Mach-Zehnder interferometer using a long-range surface plasmon polariton waveguide coupler

Quantum Plasmonics: From Quantum Statistics to Quantum Interferences

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