Superfast photon counting

Hadfield, Robert H.

doi:10.1038/s41566-020-0614-0

Cited by 14 publications

(7 citation statements)

References 11 publications

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“…As a final remark, we would like to point out that reprogrammable quantum processors based on FLW can also operate in the visible and near‐infrared wavelength range, which is an important requirement for multiple applications, from quantum memories [ 20 ] to quantum sensing of atomic transitions, [ 37 ] free‐space quantum key distribution, [ 38 ] optical circuits coupled to quantum dot sources [ 39 ] and room‐temperature quantum systems based on avalanche photodiodes instead of cryogenic single‐photon detectors. [ 40 ]…”

Section: Resultsmentioning

confidence: 99%

Low Power Reconfigurability and Reduced Crosstalk in Integrated Photonic Circuits Fabricated by Femtosecond Laser Micromachining

Ceccarelli

Atzeni

Pentangelo

et al. 2020

Laser & Photonics Reviews

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Femtosecond laser writing is a powerful technique that allows rapid and cost-effective fabrication of photonic integrated circuits with unique 3D geometries. In particular, the possibility to reconfigure such devices by thermo-optic phase shifters represents a paramount feature, exploited to produce adaptive and programmable circuits. However, the scalability is strongly limited by the flaws of current thermal phase shifters, which require hundreds of milliwatts to operate and exhibit large thermal crosstalk. In this work, thermally-insulating 3D microstructures are exploited to decrease the power needed to induce a 2 phase shift down to 37 mW and to reduce the crosstalk to a few percent. Further improvement is demonstrated when operating in vacuum, with sub-milliwatt power dissipation and negligible crosstalk. These results pave the way toward the demonstration of complex programmable integrated photonic circuits fabricated by femtosecond laser writing, thus opening exciting perspectives in integrated quantum photonics.

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Section: Resultsmentioning

confidence: 99%

Low Power Reconfigurability and Reduced Crosstalk in Integrated Photonic Circuits Fabricated by Femtosecond Laser Micromachining

Ceccarelli

Atzeni

Pentangelo

et al. 2020

Laser & Photonics Reviews

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“…It is further noted that the ability to easily modify the linear chirp rate, spectral bandwidth and comb resolution while maintaining high spectral purity to perform molecular dynamics studies across a wide range of time scales and conditions would otherwise be difficult to impossible to perform using conventional singlefrequency rapid-scanning techniques [66,50,51,53,54]. Furthermore, while these studies were performed up to 6.6 kPa (50 torr) of CO2 in a short pathlength cell, higher chirp rates are possible by increasing the bandwidth in the IF region [67]. A 5-fold increase in chirp rate may allow investigations at atmospheric pressure for applications to remote sensing.…”

Section: Discussionmentioning

confidence: 99%

Interleaved electro-optic dual comb generation to expand bandwidth and scan rate for molecular spectroscopy and dynamics studies near 1.6 µm

Stroud

Simon

Wagner³

et al. 2021

Opt. Express

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A chirped-pulse interleaving method is reported for generation of dual optical frequency combs based on electro-optic phase modulators (EOM) in a free-running all-fiber based system. Methods are discussed to easily modify the linear chirp rate and comb resolution by more than three orders of magnitude and to significantly increase the spectral bandwidth coverage. The agility of the technique is shown to both capture complex line shapes and to magnify rapid passage effects in spectroscopic and molecular dynamics studies of CO2. These methods are well-suited for applications in the areas of remote sensing, reaction dynamics, and sub-Doppler studies across the wide spectral regions accessible to EOMs.

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“…The detection of the single‐photon is a key step of measuring quantum states to generate keys. [ 66,67 ] For different wavelengths of photon and requirements of performance, the methods to detect photons are diverse. Here, we think about the wavelength of 1550 nm, which is a communication window in optical fibres.…”

Section: Methodsmentioning

confidence: 99%

Optimizing Decoy‐State Protocols for Practical Quantum Key Distribution Systems

Fan-Yuan

Wang

et al. 2021

Adv Quantum Tech

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The decoy-state protocol enables quantum key distribution (QKD) systems to achieve high performance without using the single-photon source. In the dozen years since the decoy-state protocol has been proposed, a series of advances in scheme design, finite-size analysis, system modelling, and parameter estimation has developed. Unfortunately, most advances are based on different starting points and lack a synthesis to figure out the optimal protocol of decoy-state method. Here, the advances in decoy-state method are reviewed and they are synthesized to compare the key-rate performance of 38 decoy-state protocols using the particle swarm optimization (PSO) algorithm. To form a guideline for practical QKD systems, the optimal decoy-state protocols are found with the change of five system parameters (the transmission loss, the block size of postprocessing, the misalignment-error probability, the dark-count probability, and the afterpulse rate). It is expected that this work can answer the questions of what the actual performance is for different decoy-state protocol in various scenarios and which decoy-state protocol is the optimal choice for various QKD systems.

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Superfast photon counting

Abstract: Superfast photon counting The news that superconducting nanowire detectors can detect single photons with a timing precision of just a few picoseconds will benefit applications ranging from sensing to quantum communications.

Cited by 14 publications

References 11 publications

Low Power Reconfigurability and Reduced Crosstalk in Integrated Photonic Circuits Fabricated by Femtosecond Laser Micromachining

Low Power Reconfigurability and Reduced Crosstalk in Integrated Photonic Circuits Fabricated by Femtosecond Laser Micromachining

Interleaved electro-optic dual comb generation to expand bandwidth and scan rate for molecular spectroscopy and dynamics studies near 1.6 µm

Optimizing Decoy‐State Protocols for Practical Quantum Key Distribution Systems

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