Wavelength-Sensitive Superconducting Single-Photon Detectors on Thin Film Lithium Niobate Waveguides

Prencipe, Alessandro; Gyger, Samuel; Baghban, Mohammad Amin; Zichi, Julien; Zeuner, Katharina D.; Lettner, Thomas; Schweickert, Lucas; Steinhauer, Stephan; Elshaari, Ali W.; Gallo, Katia; Zwiller, Val

doi:10.1021/acs.nanolett.3c02324

Cited by 4 publications

(1 citation statement)

References 28 publications

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“…Despite the fact that the LNOI platform has yet to prove its potential for scalable fabrication, the prospect of integrating bright non-classical light sources with small footprint processing units and integrated single photon detectors [43,44] shows the potential of the LNOI platform. These capabilities enable monolithic integration of quantum photonic experiments onto a single chip, which represents a significant step towards the realization of quantum technology's promising future.…”

Section: Discussionmentioning

confidence: 99%

On-chip tunable quantum interference in a lithium niobate-on-insulator photonic integrated circuit

Maeder,

Finco,

Kaufmann

et al. 2024

Quantum Sci. Technol.

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Programmable interferometric circuits are at the heart of integrated quantum photonic processors. While the lithium niobate-on-insulator platform has the potential to advance integrated quantum photonics due to its strong nonlinearity and tight mode confinement, the demonstration of reconfigurable two-photon interference has not yet been achieved. Here, we design, fabricate and characterize the building block of such interferometric networks in the form of a 2x2 Mach-Zehnder Interferometer. We use a thermo-optic phase shifter to achieve stable performance with a power consumption of Pπ = 44.4 mW and sub-microsecond switching times. We demonstrate the effectiveness of our device for quantum applications by measuring single-photon routing with up to 34 dB extinction ratio. We show Hong-Ou-Mandel interference with fully tunable visibilities reaching a maximum value of 97.4 ± 1.0 %. As part of large scale quantum photonic circuits, this building block will facilitate reconfigurable and tunable photonic processing units integrated alongside non-classical light sources.

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Section: Discussionmentioning

confidence: 99%

On-chip tunable quantum interference in a lithium niobate-on-insulator photonic integrated circuit

Maeder,

Finco,

Kaufmann

et al. 2024

Quantum Sci. Technol.

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Time-bin entangled Bell state generation and tomography on thin-film lithium niobate

Finco,

Miserocchi,

Maeder

et al. 2024

npj Quantum Inf

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Optical quantum communication technologies are making the prospect of unconditionally secure and efficient information transfer a reality. The possibility of generating and reliably detecting quantum states of light, with the further need of increasing the private data-rate is where most research efforts are focusing. The physical concept of entanglement is a solution guaranteeing the highest degree of security in device-independent schemes, yet its implementation and preservation over long communication links is hard to achieve. Lithium niobate-on-insulator has emerged as a revolutionising platform for high-speed classical telecommunication and is equally suited for quantum information applications owing to the large second-order nonlinearities that can efficiently produce entangled photon pairs. In this work, we generate maximally entangled quantum states in the time-bin basis using lithium niobate-on-insulator photonics at the fibre optics telecommunication wavelength, and reconstruct the density matrix by quantum tomography on a single photonic integrated circuit. We use on-chip periodically-poled lithium niobate as source of entangled qubits with a brightness of 242 MHz/mW and perform quantum tomography with a fidelity of 91.9 ± 1.0 %. Our results, combined with the established large electro-optic bandwidth of lithium niobate, showcase the platform as perfect candidate to realise fibre-coupled, high-speed time-bin quantum communication modules that exploit entanglement to achieve information security.

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Integrated photonics cascaded attenuation circuit towards single-photon detector calibration

Zhang,

Panicker,

Ang

et al. 2024

Opt. Express

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Integrated photonics platforms are a key driver for advancing scalable photonics technologies. To rigorously characterize and calibrate on-chip integrated photodetectors for ultra-sensitive applications such as quantum sensing and photonic computing, a low-power calibration source down to single-photon levels is required. To date, such sources still largely rely on off-chip bulk or fiber optic setups to accurately attenuate a laser beam referenced to a sub-mW-level primary standard. Here, we demonstrate an on-chip integrated attenuation solution where a mW-level beam is coupled to a silicon nitride photonics circuit, and is attenuated by a series of cascaded directional couplers (DCs). With an integrated silicon photodetector, we measured an attenuation at 685 nm wavelength of up to 16.61 dB with an expanded uncertainty of 0.24 dB for one DC stage. With appropriate scattering mitigation, we infer from our results that a total attenuation of 149.5 dB (expanded uncertainty of 0.5 dB) can be obtained with 9 stages of cascaded DCs, thus allowing single-photon power levels to be obtained directly on-chip from a moderate-power laser source.

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Wavelength-Sensitive Superconducting Single-Photon Detectors on Thin Film Lithium Niobate Waveguides

Cited by 4 publications

References 28 publications

On-chip tunable quantum interference in a lithium niobate-on-insulator photonic integrated circuit

On-chip tunable quantum interference in a lithium niobate-on-insulator photonic integrated circuit

Time-bin entangled Bell state generation and tomography on thin-film lithium niobate

Integrated photonics cascaded attenuation circuit towards single-photon detector calibration

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