Characterization of SQUID amplifiers for optical TES readout and exploring multiplexing approaches

While current work in quantum computing with near term noisy devices is promising, key applications will require a universal, error-corrected and fault tolerant quantum computer. Xanadu’s proposed architecture uses photon number resolving detectors in a modular way to create photonic qubits. The detectors are based on superconducting transition edge sensors (TES). Previously, TES has been limited to bespoke experiments mostly within university labs requiring niche specialists to operate as well as daily laborious optimization. Xanadu is developing the first turn-key TES detectors and has already deployed them in their photonic quantum cloud computing system.
A key property of the TES detector, in addition to photon number resolution, is the quantum efficiency (QE). A high QE across all detectors is critical for realizing a universal fault tolerant photonic quantum computer. Accurate, automated measurements of QE across many devices is a key challenge. This project aims to develop a cutting-edge, turn-key, QE measurement system.

Adan Azem
Faculty Supervisor: 
Lukas Chrostowski
British Columbia
Partner University: