Approaches to single photon detection

Thew, Rob; Curtz, Noe; Eraerds, Patrick; Walenta, Nino; Gautier, Jean-Daniel; Köller, E.; Zhang, Jun; Gisin, Nicolas; Zbinden, Hugo

doi:10.1016/j.nima.2009.05.031

Cited by 4 publications

(2 citation statements)

References 14 publications

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“…Superconducting single-photon detectors (SSPDs) are superconducting devices designed with the purpose of detecting light down to the single-photon level. They present a good quantum efficiency (QE > 10%), low dark-count rate (DK < 10 Hz) and high operating frequency (<GHz), outperforming InGaAs avalanche photodiodes (APDs) [1] in a number of cases. These characteristics make them a premium candidate for single-photon telecommunications and applications like quantum key distribution.…”

Section: Introductionmentioning

confidence: 99%

Patterning of ultrathin YBCO nanowires using a new focused-ion-beam process

Curtz

Köller

Zbinden

et al. 2010

Supercond. Sci. Technol.

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Abstract. Manufacturing superconducting circuits out of ultrathin films is a challenging task when it comes to pattern complex compounds, which are likely to be deteriorated by the patterning process. With the purpose of developing high-Tc superconducting photon detectors, we designed a novel route to pattern ultrathin YBCO films down to the nanometric scale. We believe that our method, based on a specific use of a focused ion beam, consists in locally implanting Ga 3+ ions and/or defects instead of etching the film. This protocol could be of interest to engineer high-Tc superconducting devices (SQUIDS, SIS/SIN junctions, Josephson junctions), as well as to treat other sensitive compounds.PACS numbers: 85.25. Am, 81.16.Nd, 74.78.Bz, 81.15.Cd, 85.25.Pb Patterning of ultrathin YBCO nanowires using a new focused-ion-beam process 2

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Section: Introductionmentioning

confidence: 99%

Patterning of ultrathin YBCO nanowires using a new focused-ion-beam process

Curtz

Köller

Zbinden

et al. 2010

Supercond. Sci. Technol.

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“…Although in the past years alternative detection techniques, e.g. based on cryogenically cooled superconducting nanowires [8][9][10] or sum-frequency generation 11,12 , have been successfully implemented, InGaAs/InP single photon avalanche diodes (SPADs) are today's preferred choice for detectors in integrated systems due to their compactness, robustness and reliability 12,13 .…”

mentioning

confidence: 99%

Sine gating detector with simple filtering for low-noise infra-red single photon detection at room temperature

Walenta

Lunghi²,

Guinnard³

et al. 2012

Journal of Applied Physics

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We present and analyze a gated single photonavalanchedetector using a sine gating scheme with a simple but effective low-pass filtering technique for fast low-noise single photondetection at telecom wavelength. The detector is characterized by 130 ps short gates applied with a frequency of 1.25 GHz, yields only 70 ps timing jitter and noise probabilities as low as 7⋅10−7 per gate at 10% detection efficiency. We show that the detector is suitable for high rate quantum key distribution(QKD) and even at room temperature it could allow for QKD over distances larger than 25 km

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Inhomogeneities in YBa2Cu3O7 thin films with reduced thickness

Shcherbakova¹,

Pan²,

Gorman³

et al. 2012

Physica C: Superconductivity

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Morphology and physical properties of mono-(YBa 2 Cu 3 O 7) and multilayered (YBa 2 Cu 3 O 7 /SmBa 2 Cu 3 O 7 / YBa 2 Cu 3 O 7) superconducting thin films with thickness ranging from 90 nm to 28 nm have been investigated. For both types of samples, the superconducting properties degraded with reduction of film thickness. Structural and electromagnetic properties were visualized through scanning electron microscopy and magneto-optical imaging, respectively, and revealed high level of inhomogeneity for thinner (<58>nm) samples. However, samples with thickness above 58 nm showed enhanced homogeneity, which explains better superconducting characteristics observed in these films. Results of this work demonstrate that multilayering approach performed by conventional laser ablation results in degradation of superconducting properties in films with thickness below 90 nm, although has positive impact on morphology of these films, which is crucial for device fabrication process.

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Approaches to single photon detection

Cited by 4 publications

References 14 publications

Patterning of ultrathin YBCO nanowires using a new focused-ion-beam process

Patterning of ultrathin YBCO nanowires using a new focused-ion-beam process

Sine gating detector with simple filtering for low-noise infra-red single photon detection at room temperature

Inhomogeneities in YBa2Cu3O7 thin films with reduced thickness

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