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Implementation of a Reference Interferometer for Nanodetection

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Gigahertz Detection Rates and Dynamic Photon-Number Resolution with Superconducting Nanowire Arrays.

Giovanni V Resta^1,2, Lorenzo Stasi^1,2, Matthieu Perrenoud¹

¹Group of Applied Physics, University of Geneva, Rue de l'Ecole-de-Médecine 20, CH-1211 Genève, Switzerland.

|June 23, 2023

Summary

This summary is machine-generated.

This study introduces a 14-pixel superconducting nanowire single-photon detector (SNSPD) array for quantum optics. The array achieves high detection efficiency and demonstrates advanced photon-number resolution for quantum information processing.

Keywords:

SNSPDs high detection rate photon-number resolution quantum communication quantum computing single-photon detectors

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Area of Science:

Quantum Optics
Photonics
Superconducting Devices

Background:

Superconducting nanowire single-photon detectors (SNSPDs) are crucial for quantum optics due to high system detection efficiency (SDE), low dark counts, and fast recovery.
Advancements in quantum computing and communication necessitate faster detectors with photon-number resolving capabilities.

Purpose of the Study:

To develop and characterize an SNSPD array with enhanced performance for quantum information applications.
To demonstrate the dynamic photon-number resolution of the array for accurate state reconstruction.

Main Methods:

Fabrication of a 14-independent-pixel SNSPD array.
Measurement of SDE in the telecommunications band.
Independent readout of each pixel to achieve high detection rates.
Exploitation of dynamic photon-number resolution for state reconstruction.

Main Results:

Achieved 90% SDE in the telecommunications band.
Demonstrated 1.5 GHz photon detection with 45% absolute SDE.
Showcased accurate state reconstruction for various light inputs, including long pulses.
Obtained state-of-the-art two-photon (74%) and three-photon (57%) fidelities for fiber-coupled SNSPDs.

Conclusions:

The developed SNSPD array offers significant improvements in detection speed and photon-number resolution.
This technology advances the feasibility of linear optical quantum computing, quasi-deterministic single-photon sources, and quantum repeaters.
The array's performance represents a key step towards practical quantum communication and computation systems.