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Conference on Lasers and Electro-Optics

Amplitude Multiplexing Readout for Integrated SNSPD

Alessandro Gaggero, F. Martini, F. Mattioli, F. Chiarello, Robert Čerňanský, Alberto Politi, Roberto Leoni

Published Jan 1, 2020• 0 citations
Publisher

Abstract

The growing complexity of integrated quantum optics experiments requires the simultaneous readout of an increasing number of optical mode, hence integrated detectors. Amplitude-multiplexing scheme allows the reading of tens of SNSPDs using only one coaxial- cable.
DOI
10.1364/cleo_qels.2020.ff3d.2

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The quest to enlarge the capabilities of quantum information experiments based on non-classical states of light has directed the research toward an integrated approach. Thanks to integrated photonics circuits, photons can be efficiently generated, manipulated and detected within the same integrated chip. SNSPDs are the unique detectors that showed an integration compatibility with standard PICs. Nowadays the increasing complexity of integrated quantum optics experiments requires the manipulation of many modes and the simultaneous readout of an increasing number (N) of integrated detectors, thus posing new challenges regarding the simultaneous readout of different channels. In this presentation, we will discuss the advantages and drawbacks of our approach based on the amplitude multiplexing of N active pixels, each one consisting of a SNSPD with in parallel an on-chip AuPd resistor (Ri), to read (measure) simultaneously the output of several optical modes using only one coax cable.
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Integrated arrays of Superconducting Nanowire Single Photon Detectors (SNSPDs) have shown capabilities such as Photon Number Resolution, single photon imaging and coincidences detection, and can be effectively used also in other different applications related to quantum optics. The growing complexity of such applications requires the use of multiplexing schemes for the simultaneous readout of different detectors. A simple multiplexing scheme can be realized by arranging a series of SNSPDs elements, shunted by appropriate resistances. The goal of this work is to investigate and optimize this scheme, developing a general method able to identify the optimal sets of shunting resistences for any different application. The methodology obtained is very general, and can be extended to other detection systems.
Photonic integrated circuits serve as essential platforms in quantum science, particularly in quantum communication and quantum computing, where linear high-performance single-photon detector arrays are required. Superconducting nanowire single-photon detectors (SNSPDs) are known for their outstanding overall performance and compatibility with on-chip integration, making them the preferred choice for quantum photonic applications. However, conventional SNSPD arrays face challenges such as increased readout complexity or reduced detection speed. Herein, we present an amplitude-encoded SNSPD array featuring single-channel readout and high-speed detection capabilities, demonstrating high-quality discrimination of 12 pixels. This detector can readily achieve proof-of-concept quantum random number generation, underscoring its promise for advanced quantum information applications.