Investigation of dark count rate in NbRe microstrips for single photon detection

Ercolano, P; Cirillo, C; Ejrnaes, M; Chianese, F; Salvoni, D; Bruscino, C; Satariano, R; Cassinese, A; Attanasio, C; Pepe, G P; Parlato, L

doi:10.1088/1361-6668/acf24a

Cited by 4 publications

(2 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…By utilizing these values along with ξ, we determine parameters such as the thermodynamic critical field that can be relevant for the application of NbTi films as coatings for SRF cavities [32,35,36]. Moreover, the development of ultra-thin films can be crucial for devices like superconducting nanowire single-photon detectors based on Nbbased systems [17,41,42]. The presented results also indicate that NbTi films preserve their interesting properties when deposited at room temperature and on flexible substrates.…”

Section: Resultsmentioning

confidence: 86%

Penetration depth and critical fields in superconducting NbTi thin films grown by co-sputtering at room temperature

Lee,

Yun,

Lee

et al. 2024

Phys. Scr.

View full text Add to dashboard Cite

We present a study on the superconducting properties of 300 nm thick NbTi thin films grown by co-sputtering on silicon substrates at room temperature. The samples exhibit a Nb (50 at.%) and Ti (50 at.%) chemical composition, revealing a polycrystalline structure textured along the (110) axis of the body-centered cubic structure. The measured superconducting critical temperature (Tc ) was 9.65 K, and the upper critical field extrapolated to zero temperature reached approximately 15 T, resulting in a coherence length at zero temperature of approximately 4.7 nm. The penetration depth was determined through local magnetic force microscopy measurements conducted at temperatures from 4.25 to 7 K. The obtained values ranges from 250 (15) nm at 4.25 K to 370 (20) nm at 7 K. Extrapolating these measurements to zero temperature, we obtained an estimated value of 230 (20) nm. To extend the performance and potential applications of NbTi, we additionally grew a 150 nm thick sample on flexible polyimide. In this case, we observed that the films preserved their superconducting properties, displaying a decrease in Tc to 9.2 K and a similar upper critical field compared to samples grown on silicon. The feasibility of growing NbTi alloys at room temperature, with superconducting parameters comparable to or superior to metallic Nb for the upper critical field, renders this system promising for cryogenic applications, particularly in the development of high-performance electronic devices on both rigid and flexible substrates.

show abstract

Section: Resultsmentioning

confidence: 86%

Penetration depth and critical fields in superconducting NbTi thin films grown by co-sputtering at room temperature

Lee,

Yun,

Lee

et al. 2024

Phys. Scr.

View full text Add to dashboard Cite

show abstract

“…In table 1, we reported the value of critical and setpoint currents, and both DCR and efficiency measured at the setpoint current. The setpoint current has been chosen in an interval far from the region where DCR increase exponentially due to the intrinsic contribution [14][15] [16] and where the efficiency is stable, almost at its maximum. System Detection Efficiency (SDE) was calculated as (𝑃𝐶𝑅 − 𝐷𝐶𝑅)/𝛤 𝑝ℎ𝑠 , for all the detectors.…”

Section: Detector Characterizationmentioning

confidence: 99%

High Performance Superconducting Nanowire Single Photon Detectors for QKD Applications

Bruscino,

Ercolano,

Salvoni

et al. 2024

IEEE Trans. Appl. Supercond.

Self Cite

View full text Add to dashboard Cite

The forthcoming era of quantum computers can be a threat to the conventional cryptography and data security. Quantum Key Distribution (QKD) provides unconditional security under real-life conditions with several protocols over long distances in fibre and free space communication. Superconducting Nanowire Single Photon Detectors (SNSPDs) are becoming a dominant technology for QKD thanks to their unique characteristics, such as a near-unity efficiency in the infrared, low dark counts and picoseconds time resolution. Where the detector is typically a weakness of QKD, these SNSPDs characteristics make exploitation difficult. In this work, we characterized NbN SNSPDs at 2.2 K, using a CW laser source at 1550 nm, varying both bias currents and input photon rates to prove their high efficiency at low dark counts with a high counting rate, consistent with the requirements for QKD over long distances or with a high secure key rate.

show abstract

Characterization of quasiparticle relaxation times in microstrips of NbReN for perspective applications for superconducting single-photon detectors

Makhdoumi Kakhaki,

Leo,

Spuri

et al. 2024

Materials Science and Engineering: B

View full text Add to dashboard Cite

Investigation of dark count rate in NbRe microstrips for single photon detection

Cited by 4 publications

References 46 publications

Penetration depth and critical fields in superconducting NbTi thin films grown by co-sputtering at room temperature

Penetration depth and critical fields in superconducting NbTi thin films grown by co-sputtering at room temperature

High Performance Superconducting Nanowire Single Photon Detectors for QKD Applications

Characterization of quasiparticle relaxation times in microstrips of NbReN for perspective applications for superconducting single-photon detectors

Contact Info

Product

Resources

About